How to code a loop that keep asking user to input until the user input a correct number ?

Answer 1

while ( 1 )
{
cin>>num;
if ( num == correct_num )
break;
}

here correct_num is variable on which the correct value is assigned already

Answer 2

do{
// ask for input: cin>>input;
} while(input ! = correctInput);

Answer 3

It is wrong. the cin>>num; needs to be in the do while loop.

Answer 4

#include <iostream>
using namespace std;

int main()
{
int num;
cin>>num;
do {

cout<<"enter again";

} while(num != num);

return 0;
}

correct me if this is wrong. thanks

Answer 5

And the num != num is wrong too. the second num needs to be an other variabele or a value.