goto is good

if you think otherwise you're a trendfag. goto is far more efficient than function calls for short blocks of code (lol compiler ignoring inline) and have a lot of neat applications.

goto can be used to implement a state machine rather than keeping a state variable and switching on it.


#include <stdlib.h>
#include <stdio.h>

int is_even(int n) {
    if (n < 0) n = -n;
even:
    if (n == 0) return 1;
    n--;
    goto odd;
odd:
    if (n == 0) return 0;
    n--;
    goto even;
}

int main(int argc, char **argv) {
    if (argc != 2 ) {
    fprintf(stdout, "Usage: %s <n>\n", argv[0]);
    exit(EXIT_FAILURE);
    } else {
    int n = atoi(argv[1]);
    puts(is_even(n) ? "true" : "false");
    }
    return 0;
}

forgot:


int is_even(int n) { if(n < 0) return even(-n); else return even(n); }
int is_odd(int n) { if(n < 0) return odd(-n); else return odd(n); }