9

Recurrent function

  1. #include <stdio.h>
  2.  
  3. void printd( int );
  4.  
  5. void printi( int i )
  6. {
  7.     if ( i < 0 )
  8.     {
  9.         putchar( '-' );
  10.         i = -i;
  11.     }
  12.     printd( i );
  13. }
  14.  
  15. void printd( int i )
  16. {
  17.     int d = i/10;
  18.     if ( d )
  19.         printd( d );
  20.     putchar( (char)(i%10 + '0') );
  21. }
  22.  
  23. main() {
  24.     int x;
  25.  
  26.     x = 12345;
  27.     putchar('x');
  28.     putchar('=');
  29.     printi( x );
  30.     putchar('\n');
  31.  
  32.     x = -x;
  33.     putchar('x');
  34.     putchar('=');
  35.     printi( x );
  36.     putchar('\n');
  37.  
  38.     x = 0;
  39.     putchar('x');
  40.     putchar('=');
  41.     printi( x );
  42.     putchar('\n');
  43. }
$ gcc -o recur recur.c
$ ./recur
x=12345
x=-12345
x=0

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