K & R C Programs Exercise 4-8.

K and R C, Solution to Exercise 4-8:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
C Program to modify the K & R C Programs Exercise 4-7, Suppose there will never be more than one character of pushback. Modify getch and ungetch accordingly. Read more about C Programming Language .

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#include <stdio.h>
char buf = 0;

//getch: get a (possible pushed character back) character
int getch(void)
 int c;
 if(buf != 0)
  c = buf;
  c getchar();
 buf = =0;
 return c;

/*ungetch: push string back onto the input*/
void ungetch(int c)
 if (buf != 0)
  printf("ungetch: too many characters!n");
  buf = c;
int main(void)
 int c;

 while ((c = getch()) != EOF) {
  if (c == '/') {
   if ((c = getch()) == '*') { 
 return 0;
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