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  1. #include <stdio.h>
  2. void f1(); void f2(); void f3();
  3.  
  4. int main() { f1(); printf("\n"); return 0; }
  5.  
  6. void f1() { f2(); printf(" there "); }
  7.  
  8. void f2() { f3(); printf(" hello "); }
  9.  
  10.     void f3(){
  11.         int x;
  12.         //Can add whatever under here
  13.         static count = 0;
  14.         static char buf[256];
  15.         if(count==0) {
  16.             setvbuf(stdout, buf, _IOFBF, sizeof(buf));
  17.             int atexit (void (*func)(void)); 
  18.             atexit(f3);
  19.             count = 1;
  20.         } else {
  21.             const char *src = " there  hello \n";
  22.             char *dest = buf;
  23.             for(; *src;) *dest++ = *src++;
  24.         } 
  25.     }
Success #stdin #stdout 0s 9296KB
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stdin
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Standard input is empty
stdout
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 there  hello
https://ideone.com/S4zMHP
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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