Chain_calculator.c

#include <stdio.h>

int calculate(int a, int b, char op){
    switch (op){
    case '+':
        return a + b;
    case '-':
        return a - b;
    case '*':
        return a * b;
    case '/':
        if (b != 0){
            return a / b;
        }
        return 0;
    default:
        return 0;
    }
}

int processOperation(int a, int b, char op, int *result){
    if (op == '/' && b == 0){
        printf("Error: Division by zero is not allowed.\n");
        return 0;
    }else if (op != '+' && op != '-' && op != '*' && op != '/'){
        printf("Invalid operator.\n");
        return 0;
    }else{
        *result = calculate(a, b, op);
        return 1;
    }
}

int main(){
    char op;
    int a, b;
    int result = 0;
    char uc = 'y';

    printf("Enter 1st no.: ");
    scanf("%d", &a);
    printf("Enter 2nd no.: ");
    scanf("%d", &b);
    printf("Enter choice (+,-,*,/): ");
    scanf(" %c", &op);

    if (processOperation(a, b, op, &result)){
        printf("Current Result: %d\n", result);
    }else{
        result = 0;
        printf("Starting with Result: %d\n", result);
    }

    while (uc == 'y' || uc == 'Y'){
        printf("Do you want to continue? (Y/N): ");
        scanf(" %c", &uc);

        if (uc == 'y' || uc == 'Y'){
            printf("Enter next operator (+,-,*,/): ");
            scanf(" %c", &op);
            printf("Enter next no.: ");
            scanf("%d", &b);

            if (processOperation(result, b, op, &result)){
                printf("Current Result: %d\n", result);
            }
        }
    }

    return 0;
}