Thread: If/else instead of switch/case

Hello everyone,
I just started learning C and trying to create a program in C that will have a starting menu for a calculator.
The problem is that I could do that with a switch/case but the assignment requires me to use if/else.

Here's what I have so far:

Code:

#include <stdio.h>


int calc();
int menu();




int main()
{
    printf("Hello. Welcome to the program.\n");
    printf("Press RETURN key to continue...\n");
    getchar();
    menu();


}
void menu()
{
    int choice;
    int var1;
    int var2;
    int var3;
    int var4;
    int A;
    int B;
    int C;
    int D;


    printf("Menu \n");
    printf("1. Addition.\n");
    printf("2. Multiplication.\n");
    printf("3. Square root. \n");
    printf("4. Exit")
    scanf("%d", &choice);

How should I go from now using if/else to have those 4 choices?I would really appreciate y'all's help. It's driving me crazy and I have a test on the same day of the deadline of this assignment.

Thanks!!

Reminds me of a scene in a movie.
The hot coed student comes up to the professor and says, "Prof, I'll do anything to pass this course."
Prof: "Anything?"
Student: "yes, annnyyythinnnng."
Prof: "okay, then go home and read the book and study."

Touché! ;^)

Originally Posted by sal92

How should I go from now using if/else to have those 4 choices?

I think a simple and effective way can be something like this:

Code:

if( choice == 1 )
    printf( "\n\t%d + %d = %d\n\n", n1, n2, n1+n2 );
else if( choice == 2 )
    printf( "\n\t%d x %d = %d\n\n", n1, n2, n1*n2 );
else if( choice == 3 )
    printf( "\n\tsquare root of %d = %f\n\n", n1, sqrt(n1) );
else if( choice == 4 )
    return 0;

Please, notice that choice has to be "==" (comparison) to the chosen number, not just "=" (assignment). Oh, and don't forget to include <math.h>, as sqrt() requires that library.

Can I say that I would add one more check, just to see if the user didn't type a valid choice?

A few months ago, I put together a class for my personal use that creates menu objects. Maybe someone can find it useful as well? It's attached to this message.