IfElse.java

// Program to perform mathematical operations on two numbers
double num1,num2;
String operation;
Scanner scanner = new Scanner(System.in);
		
System.out.println("Enter first number");
num1 = scanner.nextDouble();
System.out.println("Enter second number");
num2 = scanner.nextDouble();
System.out.println("Enter the operation to perform (+,-,*,/)");
operation = scanner.next();
		
if(operation.equals("+")) { // This code block runs if the condition is true
	System.out.println(num1 + num2);
}else if(operation.equals("-")) { // This is only executed if above if fails
	System.out.println(num1 - num2);
}else if(operation.equals("*")) {
	System.out.println(num1 * num2);
}else{ // if no above conditions match, this is executed
	System.out.println(num1 / num2);
}

// Always close the scanner
scanner.close();