A brief talk on C + + pointer (must-see) _c language

Pointers sometimes play an important role in programming

We can use it to do some seemingly impossible tasks.

#include <iostream>
using namespace std;
void Square (int *n) {
*n=*n**n
}
int main () {
int num = 2;
cout<< "The original number is" <<num<<endl;
Square (&num);
cout<< "The new value of number is" <<num<<endl;
return 0;
}

The above code implements the square root of the output number

It would have been impossible to output the computed value in the main program after using void, a function that did not return a value.

But after using the pointer, you can easily implement the

In the main program, we define a num=2

Use Square (&num) to pass the address of a variable to the function pointer argument

Which means that the pointer in square points to a variable in the main function.

The pointer in function square is worth changing and will change the value of num in the main function

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