Je veux utliser le variable de char dans if ...

#include <iostream> 

using namespace std;

#define pi 3.14
#define NEWLINE '\n' 

int main ()
{
    char r;
    std:: cout << " enter r:" << "\n";
    cin >>r;
    if (r>0){
    double r;
    double circle;
    
    circle = 2 * pi * r;
    cout << circle;
    cout << NEWLINE;
    }
    return 0;
    
}

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