global and local variables in c

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Gabriel
08 May 2017
1#include <stdio.h>  //local parameters take  precedance  to global//
2 
3/* global variable declaration */
4int a = 20;
5 
6int main () {
7
8  /* local variable declaration in main function */
9  int a = 10;
10  int b = 20;
11  int c = 0;
12
13  printf ("value of a in main() = %d\n",  a);
14  c = sum( a, b);
15  printf ("value of c in main() = %d\n",  c);
16
17  return 0;
18}
19
20/* function to add two integers */
21int sum(int a, int b) {
22
23   printf ("value of a in sum() = %d\n",  a);
24   printf ("value of b in sum() = %d\n",  b);
25
26   return a + b;
27}
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