Below code simple check overflow in C++
#include<stdio.h>
#include<limits.h>
#include<stdlib.h>
int addOvf(int* result, int a, int b)
{
if( a > INT_MAX - b)
return -1;
else
{
*result = a + b;
return 0;
}
}
int main()
{
int *res = (int *)malloc(sizeof(int));
int x = 2147483640;
int y = 10;
printf("%d", addOvf(res, x, y));
printf("\n %d", *res);
getchar();
return 0;
}
Time Complexity : O(1)
Space Complexity: O(1)