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  1. #include <stdio.h>
  2.  
  3. // globals (initialized to 0)
  4. int a, b, c, d;
  5.  
  6. void g1(int b, int c) {
  7.     // free a,d refer to globals
  8.     printf("%d %d %d %d\n", a, b, c, d);
  9. }
  10.  
  11. void g2(int a_, int c_) {
  12.     // parameters renamed so we don’t shadow globals
  13.     g1(a_, c_);
  14. }
  15.  
  16. int g3(int c_, int a_) {
  17.     int b_ = 3;
  18.     g1(a_, b_);
  19.  
  20.     {   // inner block with its own c,d
  21.         int c = 8;
  22.         int d = 4;
  23.         g2(a_, b_);
  24.     }
  25.  
  26.     g1(a_, b_);
  27.     return b_;
  28. }
  29.  
  30. int main(void) {
  31.     int a = 4, b = 5;   // locals shadow globals inside main
  32.     // first call: a=4 (local), b=5 (local), global c==0
  33.     a = g3(b, c);
  34.     // second call: b (local)==5, a (local)==3
  35.     g3(b, a);
  36.     return 0;
  37. }
  38.  
Success #stdin #stdout 0s 5300KB
comments (?)
stdin
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Standard input is empty
stdout
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0 0 3 0
0 0 3 0
0 0 3 0
0 3 3 0
0 3 3 0
0 3 3 0
https://ideone.com/Ya3rWb
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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