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  1. #include <stdio.h>
  2. #include <stdarg.h>
  3. int prefix_printf(const char* fmt, ...)
  4. {
  5.     printf("prefix ");
  6.  
  7.     va_list args;
  8.     va_start(args, fmt);
  9.  
  10.     int result = vprintf(fmt, args);
  11.     va_end(args);
  12.     return result;
  13. }
  14.  
  15.  
  16. int main(void) {
  17. 	prefix_printf("No number\n");
  18.     prefix_printf("Number = %d\n", 20);
  19.     return 0;
  20. }
  21.  
Success #stdin #stdout 0.01s 5536KB
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stdin
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Standard input is empty
stdout
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prefix No number
prefix Number = 20
https://ideone.com/Xz9PAK
language:
C (gcc 8.3)
created:
3 years ago
visibility:
secret

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