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int main ()

{
/* local variable declaration */
int g = 10;

printf ("value of g = %d\n", g);

return 0;

}

When the above code is compiled and executed, it produces the following result:

value of g = 10

Formal Parameters
Formal parameters are treated as local variables with-in a function and they take
precedence over global variables. Following is an example:

#include <stdio.h>

/* 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() = %d\n", a);
c = sum( a, b);

printf ("value of c in main() = %d\n", c);

return 0;

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