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  1. /* http://t...content-available-to-author-only...h.net/test/read.cgi/tech/1339338438/415 */
  2.  
  3. #include <stdio.h>
  4. #include <stdlib.h>
  5.  
  6. int X(int n)
  7. {
  8.     if (n < 1)
  9.         return 0;
  10.     return 2 * X(n - 1) + 1;
  11. }
  12.  
  13. int main(int argc, char *argv[])
  14. {
  15.     int i;
  16.     if (argc == 1)
  17.         printf("X(0) = %d\n", X(0));
  18.     else
  19.         for (i = 1; i < argc; i++) {
  20.             int n = atoi(argv[i]);
  21.             printf("X(%d) = %d\n", n, X(n));
  22.         }
  23.     return 0;
  24. }
Success #stdin #stdout 0.01s 1676KB
comments (?)
stdin 
Standard input is empty
stdout 
X(0) = 0
https://ideone.com/VgTL0
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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