int main() {
unsigned char a = 254;
unsigned char b = 1;
unsigned char c = 2;
printf ("a = %hhu\n", a);
printf ("b = %hhu\n", b);
printf ("c = %hhu\n\n", c);
if (uadd_ok (a, b)) {
printf ("next addition will not overflow\n");
} else {
printf ("next addition will overflow\n");
}
printf ("%hhu+%hhu = %hhu\n\n", a, b, a+b);
if (uadd_ok (a, c)) {
printf ("next addition will not overflow\n");
} else {
printf ("next addition will overflow\n");
}
printf ("%hhu+%hhu = %hhu\n\n", a, c, a+c);
return 0;
}
int main()
{
int x1 = UINT_MAX - 100;
int y1 = 200;
int y2 = 10;
printf("uadd_ok(UINT_MAX-100, 200) = %d\n", uadd_ok(UINT_MAX-100, 200));
printf("uadd_ok(UINT_MAX-100, 10 = %d\n", uadd_ok(UINT_MAX-100, 10));
return 0;
}
void main()
{
int a = 3947483647;
int b = 3929933123;
if (uadd_ok(a, b))
printf("Add OK\n");
else
printf("Add Overflow\n");
}
int main(){
unsigned a = 0xffffffff;
unsigned b = 0xabcd0123;
int ans = uadd_ok(a, b);
// if overflow doesn't occur
if(ans){
printf("overflow doesn't occur!\n");
}
else{
printf("overflow occur!\n");
}
}
//uadd_ok测试函数
void test_uadd_ok()
{
printf("call test_uadd_ok() \n");
unsigned x = 10u;
unsigned y = 20u;
unsigned ret = uadd_ok(x, y);
printf("uadd_ok(%u, %u) ret %d \n", x, y, ret);
x = 0xFFFFFFFFu;
y = 0u;
ret = uadd_ok(x, y);
printf("uadd_ok(%u, %u) ret %d \n", x, y, ret);
x = 0xFFFFFFFFu;
y = 123u;
ret = uadd_ok(x, y);
printf("uadd_ok(%u, %u) ret %d \n", x, y, ret);
printf("============================================================================\n");
}
