Defining a macro to output the value of an expression

#include <stdio.h>

#define print_value(expr) printf("\n" #expr " = %lf", (double)expr);

void main() {
  int n = 10;
  double f = 6.5;

  print_value( n );
  print_value( f );
  printf("\n");

  print_value(f * f + 4.0);
  print_value( n / 2 + 3);
  print_value( 3 * 4 + 12 / 2 - 8);
  printf("\n");
}

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Defining a macro to output the value of an expression : Macro Function « Macro Preprocessor « C / ANSI-C

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