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GNU C supports using compound statements as expressions.
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char **argv) {
if (argc < 2) {
fprintf(stderr, "usage: check x|y\n");
return 1;
const int is_x = ({
int _x;
if (strcmp(argv[1], "x") == 0)
_x = 1;
_x = 0;
printf("is_x = %d\n", is_x);
return 0;
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