#include <stdio.h>      // include the standard input/output library header

int f( int n ) {             // a function which takes int n, returns an int
  int result = 3*n*n + 4*n + 2;
  return result;             // you have to "return" explicitly
  }

int main() {                       // Every prog needs a function named "main"
  printf( "f(7) is %d\n", f(7) );  // Nothing prints by itself
  return 0;                        // Nothing returned!
  }