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  1. #include<stdio.h>
  2.  
  3. char buf = 0;
  4.  
  5. int getch();
  6. void ungetch(int c);
  7.  
  8. int main(void)
  9. {
  10.     int c;
  11.  
  12.     c = '*';
  13.  
  14.     ungetch(c);
  15.  
  16.     while((c=getch())!=EOF)
  17.         putchar(c);
  18.  
  19.     return 0;
  20. }
  21.  
  22. /* getch: get a (possibly) pushed back character */
  23.  
  24. int getch(void)
  25. {
  26.     int c;
  27.  
  28.     if(buf!=0)
  29.         c = buf;
  30.     else
  31.         c = getchar();
  32.  
  33.     buf =0; 
  34.     return c;
  35. }
  36.  
  37. /* ungetch: push a character back into input */
  38.  
  39. void ungetch(int c)
  40. {
  41.     if(buf != 0)
  42.         printf("ungetch: too many characters\n");
  43.     else
  44.         buf = c;
  45. }
  46.  
Success #stdin #stdout 0s 9432KB
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stdin
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jk
stdout
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*jk
https://ideone.com/ydVWF2
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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