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#include <iostream>
using namespace std;
// Driver Code
int main()
{
// const int x; CTE error
// x = 9; CTE error
const int y = 10;
cout << y;
return 0;
}
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#include <iostream>
using namespace std;
#define PI 3.14159
#define NEWLINE '\n'
int main ()
{
double r=5.0; // radius
double circle;
circle = 2 * PI * r;
cout << circle;
cout << NEWLINE;
}
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