在C語言中,divide
操作符(即/
)本身并不容易出錯,但它在某些情況下可能會導致意外的結果或錯誤。以下是一些可能導致問題的常見情況:
int a = 7;
int b = 3;
int result = a / b; // result will be 2, not 2.3333
int a = 7;
int b = 0;
int result = a / b; // undefined behavior, may crash or return garbage
double a = 7.0;
int b = 3;
double result = a / b; // This is fine, but if you change 'b' to an int, the warning will disappear
如果你改變b
的類型為int
,編譯器將不再發(fā)出警告,但結果可能不是你所期望的:
double a = 7.0;
int b = 3;
double result = a / (int)b; // This is risky, as the cast may truncate the result
int a = INT_MAX;
int b = 1;
int result = a / b; // result will be INT_MIN, due to wrap around
為了避免這些問題,你可以:
long long
)來避免溢出。