mini-calculator.c

#include <stdio.h>

int main(void) {
    int a,b, op;
    op = 5;
    printf("Enter the value of A: ");
    scanf("%i", &a);

    printf("Enter the value of B: ");
    scanf("%i", &b);

    while(op != 0) {
        printf("Select an operation:\n   [0] To exit\n   [1] For addition\n   [2] For substraction\n   [3] For multiplication\n   [4] For division\nSelect your choice: [0,1,2,3,4]:");
        scanf("%i", &op);

        switch(op) {
            case 1:
                printf("\nAnswer is : %i\n", a + b);
                break;
            case 2:
                printf("\nAnswer is : %i\n", a - b);
                break;
            case 3:
                printf("\nAnswer is : %i\n", a * b);
                break;
            case 4:
                printf("\nAnswer is : %i\n", a / b);
                break;
            case 0:
                printf("Goodbye !");
                break;
            default:
                printf("ERROR!! operation invalid.\n");
        }
    }
}