include <stdio.h>

long int addition(long int, long int); long int subtraction(long int, long int); long int multiplication(long int, long int); long int division(long int, long int);

int main(void) { char c; long int first; long int second; long int answer;

while (1){    
printf("Please choose your operation: \n");
printf("a. Addition         s. Subtraction\n");
printf("m. Multiplication   d. Division\n");
printf("q. Quit\n");
(c = getchar()) != 'q')
{
switch (c)
{
case 'a':
    printf("Please enter two integers: \n");
        scanf("%ld %ld", &first, &second);
        answer = addition(first, second);
        printf("The sum of %ld and %ld is %ld\n", first, second, answer);
        break;
case 's':
    printf("Please enter two integers: \n");
        scanf("%ld %ld", &first, &second);
        answer = subtraction(first, second);
        printf("The difference between %ld and %ld is %ld\n", first, second, answer);
        break;
case 'm':
    printf("Please enter two integers: \n");
    scanf("%ld %ld", &first, &second);
    answer = multiplication(first, second);
    printf("The product of %ld and %ld is %ld\n", first, second, answer);
    break;

case 'd':
    printf("Please enter two integers: \n");
    scanf("%ld %ld", &first, &second);
    answer = division(first, second);
    printf("The quotient of %ld and %ld is %ld\n", first, second, answer);
    break;
}   
    printf("Buh Bye!");
}

}

return 0;

}

long int addition(long int a, long int b) { long int sum = a + b; return sum; }

long int subtraction(long int a, long int b) { long int difference = a - b;

return difference;

}

long int multiplication(long int a, long int b) { long int product = a * b;

return product;

}

long int division(long int a, long int b) { long int quotient = a / b;

return quotient;

}