package com.example.scientificcalculator;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
Button b1, b2, b3, b4, b5, b6, b7, b8, b9, b0, bdot, bpi, bequal, bmin, bplus, bdiv, bmul, bminus, blog, bac, bc, bb1, bb2, bln, bsin, bcos, btan, binv, bsqrt, bsquare, bfact;
TextView tvsec, tvmain;
String pi = "3.14159265";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1 = findViewById(R.id.b1);
b2 = findViewById(R.id.b2);
b3 = findViewById(R.id.b3);
b4 = findViewById(R.id.b4);
b5 = findViewById(R.id.b5);
b6 = findViewById(R.id.b6);
b7 = findViewById(R.id.b7);
b8 = findViewById(R.id.b8);
b9 = findViewById(R.id.b9);
b0 = findViewById(R.id.b0);
bac = findViewById(R.id.bac);
bc = findViewById(R.id.bc);
bb1 = findViewById(R.id.bb1);
bb2 = findViewById(R.id.bb2);
bpi = findViewById(R.id.bpi);
bdot = findViewById(R.id.bdot);
bequal = findViewById(R.id.bequal);
bplus = findViewById(R.id.bplus);
bminus = findViewById(R.id.bminus);
bmul = findViewById(R.id.bmul);
bdiv = findViewById(R.id.bdiv);
binv = findViewById(R.id.binv);
bsqrt = findViewById(R.id.bsqrt);
bsquare = findViewById(R.id.bsquare);
bfact = findViewById(R.id.bfact);
bln = findViewById(R.id.bln);
bsin = findViewById(R.id.bsin);
bcos = findViewById(R.id.bcos);
btan = findViewById(R.id.btan);
blog = findViewById(R.id.blog);
tvmain = findViewById(R.id.tvmain);
tvsec = findViewById(R.id.tvsec);
//OnClickListener
b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "1");
}
});
b2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "2");
}
});
b3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "3");
}
});
b4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "4");
}
});
b5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "5");
}
});
b6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "6");
}
});
b7.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "7");
}
});
b8.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "8");
}
});
b9.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "9");
}
});
b0.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "0");
}
});
bdot.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + ".");
}
});
bac.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText("");
tvsec.setText("");
}
});
bc.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String val = tvmain.getText().toString();
val = val.substring(0, val.length() - 1);
tvmain.setText(val);
}
});
bplus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "+");
}
});
bminus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "-");
}
});
bdiv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "÷");
}
});
bmul.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "×");
}
});
bsqrt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String val = tvmain.getText().toString();
double r = Math.sqrt(Double.parseDouble(val));
tvmain.setText(String.valueOf(r));
}
});
bb1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "(");
}
});
bb2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + ")");
}
});
bpi.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvsec.setText(bpi.getText());
tvmain.setText(tvmain.getText() + pi);
}
});
bsin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "sin");
}
});
bcos.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "cos");
}
});
btan.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "tan");
}
});
binv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "^" + "(-1)");
}
});
bfact.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int val = Integer.parseInt(tvmain.getText().toString());
int fact = factorial(val);
tvmain.setText(String.valueOf(fact));
tvsec.setText(val + "!");
}
});
bsquare.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
double d = Double.parseDouble(tvmain.getText().toString());
double square = d * d;
tvmain.setText(String.valueOf(square));
tvsec.setText(d + "²");
}
});
bln.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "ln");
}
});
blog.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvmain.setText(tvmain.getText() + "log");
}
});
bequal.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String val = tvmain.getText().toString();
String replacedstr = val.replace('÷', '/').replace('×', '*');
double result = eval(replacedstr);
tvmain.setText((String.valueOf(result)));
tvsec.setText(val);
}
});
}
//Factorial function
int factorial(int n) {
return (n == 1 || n == 0) ? 1 : n * factorial(n - 1);
}
//eval function
public static double eval(final String str) {
return new Object() {
int pos = -1, ch;
void nextChar() {
ch = (++pos < str.length()) ? str.charAt(pos) : -1;
}
boolean eat(int charToEat) {
while (ch == ' ') nextChar();
if (ch == charToEat) {
nextChar();
return true;
}
return false;
}
double parse() {
nextChar();
double x = parseExpression();
if (pos < str.length()) throw new RuntimeException("Unexpected: " + (char) ch);
return x;
}
//Grammer:
//expression = term | expression '+' term | expression '-' term
//term = factor | term '*' factor | term '/' factor
//factor = '+' factor | '-' factor | '(' expression ')'
// | number | factorName factor | factor '^' factor
double parseExpression() {
double x = parseTerm();
for (; ; ) {
if (eat('+')) x += parseTerm(); //Addition
else if (eat('-')) x -= parseTerm(); //Subtraction
else return x;
}
}
double parseTerm() {
double x = parseFactor();
for (; ; ) {
if (eat('*')) x *= parseTerm(); //Multiplication
else if (eat('/')) x /= parseTerm(); //Division
else return x;
}
}
double parseFactor() {
if (eat('+')) return parseFactor(); //Unary Plus
if (eat('-')) return -parseFactor(); //Unary Minus
double x;
int startPos = this.pos;
if (eat('(')) { // Parentheses
x = parseExpression();
eat(')');
} else if ((ch >= '0' && ch <= '9') || ch == '.') { //Numbers
while ((ch >= '0' && ch <= '9') || ch == '.') nextChar();
x = Double.parseDouble(str.substring(startPos, this.pos));
} else if ((ch >= 'a' && ch <= 'z') || ch == '.') { //Functions
while ((ch >= 'a' && ch <= 'z') || ch == '.') nextChar();
String func = str.substring(startPos, this.pos);
x = parseFactor();
if (func.equals("sqrt")) x = Math.sqrt(x);
else if (func.equals("sin")) x = Math.sin(Math.toRadians(x));
else if (func.equals("cos")) x = Math.cos(Math.toRadians(x));
else if (func.equals("tan")) x = Math.tan(Math.toRadians(x));
else if (func.equals("log")) x = Math.log10(x);
else if (func.equals("ln")) x = Math.log(x);
else throw new RuntimeException("Unknown function: " + func);
} else {
throw new RuntimeException("Unexpected: " + (char) ch);
}
if (eat('^')) x = Math.pow(x, parseFactor()); //Exponentiation
return x;
}
}.parse();
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="10"
tools:context=".MainActivity">
<TextView
android:id="@+id/tvsec"
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#000"
android:text=""
android:textColor="#f6f6f6"
android:textSize="30sp"
android:textAlignment="viewEnd"
android:padding="10dp"
android:gravity="bottom"
android:maxLines="1"
android:layout_weight="1">
</TextView>
<TextView
android:id="@+id/tvmain"
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#000000"
android:text=""
android:textColor="#fff"
android:textSize="50sp"
android:textAlignment="viewEnd"
android:padding="10dp"
android:gravity="bottom"
android:maxLines="1"
android:layout_weight="2">
</TextView>
<LinearLayout
android:layout_weight="7"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="0dp">
<LinearLayout
android:orientation="vertical"
android:weightSum="7"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_weight="1"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:weightSum="4"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/bac"
android:text="AC"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/bc"
android:text="C"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/bb1"
android:text="("
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/bb2"
android:text=")"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:weightSum="5"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/bsin"
android:text="sin"
android:textAllCaps="false"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/bcos"
android:text="cos"
android:textAllCaps="false"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/btan"
android:text="tan"
android:textAllCaps="false"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/blog"
android:text="log"
android:textAllCaps="false"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/bln"
android:text="ln"
android:textAllCaps="false"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:weightSum="5"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/bfact"
android:text="x!"
android:textAllCaps="false"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/bsquare"
android:text="x²"
android:textAllCaps="false"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/bsqrt"
android:text="√"
android:textAllCaps="false"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/binv"
android:text="1/x"
android:textAllCaps="false"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/bdiv"
android:text="÷"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:weightSum="4"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/b7"
android:text="7"
android:textSize="30sp"
android:background="#000"
android:textColor="#fff"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/b8"
android:text="8"
android:textSize="30sp"
android:background="#000"
android:textColor="#fff"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/b9"
android:text="9"
android:textSize="30sp"
android:background="#000"
android:textColor="#fff"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/bmul"
android:text="×"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:weightSum="4"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/b4"
android:text="4"
android:textSize="30sp"
android:background="#000"
android:textColor="#fff"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/b5"
android:text="5"
android:textSize="30sp"
android:background="#000"
android:textColor="#fff"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/b6"
android:text="6"
android:textSize="30sp"
android:background="#000"
android:textColor="#fff"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/bmin"
android:text="-"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:weightSum="4"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/b1"
android:text="1"
android:textSize="30sp"
android:background="#000"
android:textColor="#fff"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/b2"
android:text="2"
android:textSize="30sp"
android:background="#000"
android:textColor="#fff"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/b3"
android:text="3"
android:textSize="30sp"
android:background="#000"
android:textColor="#fff"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/bplus"
android:text="+"
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:weightSum="4"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/bpi"
android:text="π"
android:textSize="30sp"
android:background="#000"
android:textColor="#fff"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/b0"
android:text="0"
android:textSize="30sp"
android:background="#000"
android:textColor="#fff"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/bdot"
android:text="."
android:textSize="30sp"
android:background="#000"
android:textColor="#fff"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
<Button
android:id="@+id/bequal"
android:text="="
android:textSize="30sp"
android:background="#000"
android:textColor="#ffa500"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</Button>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
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