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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <stdarg.h>
  4.  
  5. void my_printf(const char *fmt, ...)
  6. {
  7.     va_list ap;
  8.     va_start(ap, fmt);
  9.     char c;
  10.     while ((c =  *fmt++) != '\0') {
  11.         if (c == '%') {
  12.             if ((c = *fmt++) == '\0') {
  13.                 break;
  14.             }
  15.             switch(c) {
  16.                 case 's': {
  17.                     const char *s = va_arg(ap, const char *);
  18.                     fwrite(s, 1, strlen(s), stdout);
  19.                     break;
  20.                 }
  21.                 case 'c': {
  22.                     const char x = (char) va_arg(ap, int);
  23.                     putchar(x);
  24.                     break;
  25.                 }
  26.                 case '%':
  27.                     putchar('%');
  28.                     break;
  29.                 case 'x': /* ... */; break;
  30.                 case 'z': /* ... */; break;
  31.                 default: putchar(c); break;
  32.             }
  33.         } else {
  34.             putchar(c);
  35.         }
  36.     }
  37.     va_end(ap);
  38. }
  39.  
  40. int main(void)
  41. {
  42.     my_printf("%s%c", "Hello, world", '\n');
  43. }
Success #stdin #stdout 0s 9424KB
comments (?)
stdin
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Standard input is empty
stdout
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Hello, world
https://ideone.com/9r6T6x
custom printf-like function
language:
C99 (gcc 8.3)
created:
7 years ago
visibility:
secret

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