How to use an array index as an operator?

Question

How to use an array index as an operator?

Such that:

#include

main()
{
    char sign[]={\'+\',\'-\'};
    int a, b;
    a = 12 sign[1] 10         


        

Answer 1

The simplest is to use a switch statement or if-else chain.

#include

int main() {
    char sign[]={'+','-'};
    int a,b;

    switch (sign[1]) {
        case '+':
            a = 12 + 10;
            break;

        case '-':
            a = 12 - 10;
            break;
    }

    printf("%d",a);
}

If I was doing this, I'd probably end up moving some of the logic into a function though. Perhaps something like this:

#include

int perform_operation(char op, int lhs, int rhs) {
    switch (op) {
        case '+':
            return lhs + rhs;

        case '-':
            return lhs - rhs;

        default:
            return 0;
    }
}

int main() {
    char sign[]={'+','-'};
    int a = perform_operation(sign[1], 12, 10);
    printf("%d",a);
}