K & R C Programs Exercise 4-9.

K and R C, Solution to Exercise 4-9:
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 4-8, getch and ungetch do not handlea pushed back EOF correctly. Decide what their properties ought to be if an EOF is pushed back, then implement the design
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#include<stdio.h>
#define BUFSIZE 100
int buf[BUFSIZE];
int bufp = 0;

//getch: get a (possibly pushed back) character
int getch(void)
{
return (bufp > 0) ? buf[--bufp] : getchar();
}
//ungetch: push a character back onto the input
void ungetch(int c)
{
if(bufp >= BUFSIZE)
printf("ungetch: too many characters!");
else
buf[bufp++] = c;
}
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