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void fn_4parms (unsigned char a, long *b, long *c, unsigned int *d) { if (*b != 1 || *c != 2 || *d != 3) abort (); } int main () { unsigned char a = 0; unsigned long b = 1, c = 2; unsigned int d = 3; fn_4parms (a, &b, &c, &d); return 0; }