cómo hacer una variable global en el ejemplo de código c

Ejemplo 1: variables globales y locales en c

#include <stdio.h>  //local parameters take  precedance  to global//
 
/* global variable declaration */
int a = 20;
 
int main () {

  /* local variable declaration in main function */
  int a = 10;
  int b = 20;
  int c = 0;

  printf ("value of a in main() = %dn",  a);
  c = sum( a, b);
  printf ("value of c in main() = %dn",  c);

  return 0;
}

/* function to add two integers */
int sum(int a, int b) {

   printf ("value of a in sum() = %dn",  a);
   printf ("value of b in sum() = %dn",  b);

   return a + b;
}

Ejemplo 2: Cómo definir variables globales

Use pm.globals to define a global variable:

pm.globals.set("variable_key", "variable_value");

Ejemplo 3: variable globlal c

#include <stdio.h>
 
/* global variable declaration */
int g;
 
int main () {

  /* local variable declaration */
  int a, b;
 
  /* actual initialization */
  a = 10;
  b = 20;
  g = a + b;
 
  printf ("value of a = %d, b = %d and g = %dn", a, b, g);
 
  return 0;
}

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