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  1. #include <stdio.h>
  2.  
  3. void tohex(int n) {
  4.     if (n == 0) return;
  5.  
  6.     tohex(n / 16);  
  7.  
  8.     int a = n % 16;
  9.     if (a < 10)
  10.         printf("%d", a);         
  11.     else
  12.         printf("%c", 'A' + a - 10);  
  13. }
  14.  
  15. int main(void) {
  16.     int n;
  17.     scanf("%d", &n);
  18.  
  19.     if (n <= 0) {
  20.         printf("エラー");
  21.         return 1;
  22.     }
  23.  
  24.     printf("16進数表記：");
  25.     tohex(n);
  26.     printf("\n");
  27.  
  28.     return 0;
  29. }
  30.  
Success #stdin #stdout 0.01s 5320KB
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133
stdout
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16進数表記：85
https://ideone.com/A7NIUr
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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