| Excerpt |
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When we implement add function by operator + in C++, sometimes we face over error - actually system does not show any error and that should be continuously increased, but there is a possibility to change into minus value suddenly. |
You can see the same case when you compile and run by below code:
...
Below safe_add() function enables you to check overflow error:
| Code Block | ||||
|---|---|---|---|---|
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#define INT_MAX 2147483647
#define INT_MIN -2147483648
int safe_add(int &sum, int a, int b) {
if (abs(a)>INT_MAX-abs(b)) {
cout << "overflow : " << a << "+" << b << endl;
return 0;
}
sum = a + b;
return 1;
} |
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