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  1. #include <stdarg.h>
  2. #include <stdio.h>
  3.  
  4. void printtwice(const char *fmt, ...) {
  5. 	va_list args;
  6.  
  7. 	va_start(args, fmt);
  8.     vprintf(fmt, args);
  9.     va_end(args);
  10.  
  11. 	va_start(args, fmt);
  12.     vfprintf(stderr, fmt, args);
  13.     va_end(args);
  14. }
  15.  
  16. int main(void) {
  17.     printtwice("%d-->%f\n", 42, 2.7182818);
  18. }
  19.  
Success #stdin #stdout #stderr 0s 9424KB
comments (?)
stdin
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Standard input is empty
stdout
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42-->2.718282
stderr
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42-->2.718282
https://ideone.com/n25HRb
va_list
language:
C (gcc 8.3)
created:
6 years ago
visibility:
secret

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