Question

Computer Security question

Suppose you have two integer variables a and b and wish to check if their multiplication will lead to an overflow. Write code below in C++ to check to see if the multiplication is safe (if it is unsafe, exit(-1) ). You have as a constant MAX_INT to work with.

Answer 1

#include<iostream>

#include<cstdlib>

using namespace std;

int main(){

int a,b,c;

c=0;

for(int i=0;c<=MAX_INT && i<b;i++)

c=a+c;

if(i!=b)

cout<<"Exit -1";

else

cout<<"Sucessful";

return 0;

}