What does local variables be like ? What's its use in c++ ??

Answer 1

#include <iostream>

using namespace std;

int g; //global variable.

int main()
{
int l; // local variable.

return 0;
}

A local variable can only be use in its own block.
A global variable can be use in all functions from its class.

Answer 2

Like what Max stated, a local variable can only be used inside its own block {} . The use of it is to prevent outside blocks from using some variables accidentally or changing it's value.