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  1. #include <stdio.h>
  2.  
  3. int naive_show_int(int x) {
  4.     char buf[32];
  5.     char *p = buf + sizeof(buf);
  6.     *--p = 0;
  7.     int negative = 0;
  8.     if (x < 0) {
  9.         x = -x;
  10.         negative = 1;
  11.     }
  12.     while (x > 0) {
  13.         if (x <= 0)
  14.             return -1;
  15.         int digit = '0' + x % 10;
  16.         if (digit < '0' || digit > '9')
  17.             return -1;
  18.         *--p = digit;
  19.         x /= 10;
  20.     }
  21.     if (negative)
  22.         *--p = '-';
  23.         puts(p);
  24.     return 0;
  25. }
  26.  
  27. int main() {
  28.     int r;
  29.     r = naive_show_int(123456789);
  30.     printf("r = %d\n", r);
  31.     r = naive_show_int(-123456789);
  32.     printf("r = %d\n", r);
  33.     r = naive_show_int(0x80000000);
  34.     printf("r = %d\n", r);
  35.     return 0;
  36. }
Success #stdin #stdout 0s 2160KB
comments (?)
stdin
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Standard input is empty
stdout
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123456789
r = 0
-123456789
r = 0
-./,),(-*,(
r = 0
https://ideone.com/EFGoBi
language:
C (gcc 8.3)
created:
10 years ago
visibility:
secret

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