If I could change one thing about C...

If I could change one thing about C, it would be to add the ability to have functions return lists. In other word, I would have added the ability to do this to C:

(int, int) function(int a) {
    if(a < 0) {
        return (1,a);
    } else {
        return (-1,-a);
    } 
}
main() {
    int a, b;
    (a,b) = function(3); 
    printf("%d %d\n",a,b);
}

This would have been easy to add; it's a simple matter of having more variables on the stack. There are three ways one can do this with C, all of which I find rather ugly:

int function(int a, int *b) {
    if(a < 0) {
        *b = a;
        return 1;
    } else {
        *b = -a;
        return -1;
    } 
}
main() {
    int a, b;
    a = function(3, &b);
    printf("%d %d\n",a,b);
}

Or

typedef struct {
    int a;
    int b; } tuplet;

tuplet function(a) {
    tuplet c;
    if(a < 0) {
        c.a = 1;
        c.b = a;
        return c;
    } else {
        c.a = -1;
        c.b = -a;
        return c;
    } 
}
main() {
    int a, b;
    tuplet c;
    c = function(3);
    a = c.a;
    b = c.b; 
    printf("%d %d\n",a,b);
}

Or

#include <stdint.h>
uint32_t function(int i) {
    int16_t a,b;
    if(a < 0) {
        a = 1;
        b = i;
    } else {
        a = -1;
        b = -i;
    }
    return (a << 16) | b; 
}

main() {
    int16_t a, b;
    uint32_t c;
    c = function(3); 
    a = c >> 16;
    b = c & 0xffff;
    printf("%d %d\n",a,b);
}

Oh well, there's a reason why Deadwood and MaraDNS 2.0 will probably be my last ever non-OOP C project.