#include <cstdio>
int f(int x) {
#define return(t) return (printf("%d => %d", x, t), t)
if (x < 0)
return (x * x);
if (x > 0)
return (-x);
return (2*x + 4);
#undef return
}
int main() {
f(100);
return 0;
}
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