void o3(int *a, int *b, int *c) {
    int tmp;
    switch ((*a>*b) + 2*(*b>*c) + 4*(*a>*c)) {                // <== hidden ifs
        default: break; // case 3 and case 4 never happen
        case 0: /*already in order*/ break;                   // no swapping
        case 1: tmp = *a; *a = *b; *b = tmp; break;           // swap a and b
        case 2: tmp = *b; *b = *c; *c = tmp; break;           // swap b and c
        case 7: tmp = *a; *a = *c; *c = tmp; break;           // swap a and c
        case 5: tmp = *a; *a = *b; *b = *c; *c = tmp; break;  // swap a and b and c
        case 6: tmp = *a; *a = *c; *c = *b; *b = tmp; break;  // swap a and c and b
    }
}
 
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
 
int main(void) {
    srand(time(0));
    for (int k = 0; k < 256; k++) {
        int a = rand() % 10, b = rand() % 10, c = rand() % 10;
        o3(&a, &b, &c);
        printf("%d%d%d ", a, b, c);
    }
    puts("");
    return 0;
}

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