Building a better Calculator | Java | Tutorial 17

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Throughout the course we'll be looking at various topics including variables, arrays, getting user input, loops, conditionals, object orientation, and much more.

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If people just watch his vids, they'll learn easily in just one watch.

pizzacookie

For those who do not get the output, use this:

Scanner keyboardInput = new Scanner(System.in);
System.out.print("Enter a number: ");
double num1 = keyboardInput.nextDouble();

System.out.print("Enter another number: ");
double num2 = keyboardInput.nextDouble();

System.out.print("Enter an operator: ");
char op =

if(op == '+') {
System.out.println(num1 + num2);
}
else if(op == '-') {
System.out.println(num1 - num2);
}
else if(op == '*') {
System.out.println(num1 * num2);
}
else if(op == '/'){
System.out.println(num1 / num2);
}
else {
Operator!");
}

karencastelino

what about taking in the whole expression on one input and parsing it all at once? what about adding exponents and quantities using parenthesis? order of operations? PEMDAS?? How would one implement all of that?

ianfischer