Question

What is the software bug, and how do you fix the issue for the code fragment below?

#include <iostream>

#include <limits>

using namespace std;

int main()

{

int x;

//find the maximum integer value and avoid an overflow

int imax = std::numeric_limits ::max();

cout <<"Enter a value for x: ";

cin >> x;

if (x > imax)

cout << "overflow\n";

else

cout << x;

return 0;

}

Answer 1

Compilation error:
--------------------
There is a compiler error in this code.
we need to mention a parameter type for numeric_limits.
it should be numeric_limits<int> instead of numeric_limits.

Changed code:
--------------
#include <iostream>
#include <limits>

using namespace std;

int main() {
    int x;
//find the maximum integer value and avoid an overflow
    int imax = std::numeric_limits<int>::max();
    cout << "Enter a value for x: ";
    cin >> x;
    if (x > imax)
        cout << "overflow\n";
    else
        cout << x;
    return 0;
}

Logic error:
--------------
input from the user is stored in an int.
so, if a larger number is entered by the answer, then it will cause an overflow even before checking for it.

Changed code:
--------------
#include <iostream>
#include <limits>

using namespace std;

int main() {
    long x;
//find the maximum integer value and avoid an overflow
    int imax = std::numeric_limits<int>::max();
    cout << "Enter a value for x: ";
    cin >> x;
    if (x > imax)
        cout << "overflow\n";
    else
        cout << x;
    return 0;
}