/* Determine whether arguments can be subtracted without overflow */
int tsub_ok(int x, int y)
{
char *bool[] = {" not ", " "};
int z = x - y;
int a = x>>(w-1);
int b = y>>(w-1);
int c = z>>(w-1);
int d = ((a|b)==-1) && ((a&b)==0) && ((a|c)==-1) && ((a&c)==0);
printf("In %s, x = %d, \t y = %d, \t z = %d, \t x - y is%soverflow!\n", __func__, x, y, z, bool[d]);
return d;
}
int
main ( int argc, char *argv[] )
{
tsub_ok(0, -1);
tsub_ok(INT_MAX, 0);
tsub_ok(INT_MAX, -1);
tsub_ok(INT_MIN, 0);
tsub_ok(INT_MIN, 1);
tsub_ok(INT_MIN, 2);
tsub_ok(INT_MIN + 1, 1);
tsub_ok(INT_MAX - 1, -1);
return EXIT_SUCCESS;
} /* ---------- end of function main ---------- */
int main()
{
int x, y;
printf("input x and y:");
scanf("%d, %d", &x, &y);
printf("resutl = %d\n", tsub_ok(x, y));
return 0;
}
int
main(int argc,
char **argv) {
printf("%d\n", tadd_ok_char(-127, -4));
printf("%d\n", tadd_ok_char(-1, -2));
printf("%d\n", tadd_ok_char(-1, 7));
printf("%d\n", tadd_ok_char(126, 20));
printf("\n");
printf("%d\n", tadd_ok(INT_MIN, INT_MIN));
printf("%d\n", tadd_ok(INT_MIN, -4));
printf("%d\n", tadd_ok(-1, -2));
printf("%d\n", tadd_ok(-1, 7));
printf("%d\n", tadd_ok(INT_MAX, 20));
printf("%d\n", tadd_ok(INT_MAX, INT_MAX));
printf("\n");
printf("%d\n", tsub_ok(INT_MIN, INT_MIN));
printf("%d\n", tsub_ok(INT_MIN, -4));
printf("%d\n", tsub_ok(-1, -2));
printf("%d\n", tsub_ok(-1, 7));
printf("%d\n", tsub_ok(INT_MAX, 20));
printf("%d\n", tsub_ok(INT_MAX, INT_MAX));
printf("INT_MIN = %d\t -INT_MIN = %d\n", INT_MIN, (-INT_MIN));
return EXIT_SUCCESS;
}
int main(){
printf("tsub_ok(0x00000001,0x80000000)=%d\n",tsub_ok(0x00000001,0x80000000));
printf("tsub_ok(0x80000000,0x00000001)=%d\n",tsub_ok(0x80000000,0x00000001));
printf("tsub_ok(0x80000000,0x80000000)=%d\n",tsub_ok(0x80000000,0x80000000));
return 0;
}
