C++ return value without return statement

Question

When I ran this program:

#include 

int sqr(int&);

int main()
{
    int a=5;
    std::cout<<\"Square of (5) is: \"<< sqr(a)          


        

Answer 1

Your function sqr() has no return statement. The function has undefined behavior concerning return value. Your first output shows this return value.

The compiler should show a diagnostic though.

try this:

int sqr(int x)
{
  return x*x;
}