to make this shape by this code why i have to but [cout endi;] on this line and why not i but [return 0]; insted of cout endi;

Question

#include <iostream>

using namespace std;

int main()
{
for(int i=1;i<=10;i++)
{
for(int j=1; j<=10; j++)
{
if (i==1||i==10)
cout<<"*";
else if (j==1||j==10)
cout<<"*";
else
cout<<" ";

}cout<<endl;
}
}

**********
* *
* *
* *
* *
* *
* *
* *
* *
**********

Answer 1

"cout<<endl;" - output end of line.

String return 0; terminates the main() function and returns 0 to the calling process. A non-zero value (usually 1) indicates abnormal termination.
If there is no return expression, then the C++ compiler indirectly adds "return 0;" in the end of the main() function.