How To Declare Global Function In C Code Example

Example: global and local variables in 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() = %d\n",  a);   c = sum( a, b);   printf ("value of c in main() = %d\n",  c);    return 0; }  /* function to add two integers */ int sum(int a, int b) {     printf ("value of a in sum() = %d\n",  a);    printf ("value of b in sum() = %d\n",  b);     return a + b; }