Пример на C

 1: /*
 2:  * Code style example
 3:  * (c) dluciv 2008
 4:  * */
 5: #include <stdio.h>
 6: #include <mem.h>
 7: 
 8: /* useless macro */
 9: #define N -1
10: 
11: /* useless global variable */
12: int x = 0;
13: 
14: /*
15: returns x-y without real substraction
16: */
17: int sub(int x, int y)
18: {
19:   return x + 1 + (~y); /* or may be x + 1 + (N^y) */
20: }
21: 
22: /*
23: main routine.
24: asks for x and y and prints x-y
25: */
26: int main()
27: {
28:   int x, y;
29: 
30:   puts("Input x, then y");
31:   scanf("%d %d", &x, &y);
32:   printf("%d\n", sub(x, y));
33:   return 0;
34: }