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#include <assert.h>
#include <stdlib.h>
#include <sys/wait.h>
int main() {
int res;
res = system("true");
assert(WIFEXITED(res));
assert(WEXITSTATUS(res) == 0);
res = system("false");
assert(WIFEXITED(res));
assert(WEXITSTATUS(res) == 1);
res = system(NULL);
assert(res == 1);
}
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