Jan 17, 2012

K & R C Programs Exercise 5-1.

K and R C, Solution to Exercise 5-1:
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 get next integer from input into space, so that getint treats a + or - not followed by a digit as a valid representation of zero and fix it to push such a character back on the input. Read more about C Programming Language .
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include<ctype.h>

int getch(void);
void ungetch(int);

/* getint:  get next integer from input into *pn */
int getint(int *pn)
{
 int c, sign, sawsign;

 while (isspace(c = getch()))   /* skip white space */
  ;
 if (!isdigit(c) && c != EOF && c != '+' && c != '-') {
  ungetch(c);    /* it's not a number */
  return 0;
 }
 sign = (c == '-') ? -1 : 1;
 if (sawsign = (c == '+' || c == '-'))
  c = getch();
 if (!isdigit(c)) {
  ungetch(c);
  if (sawsign)
   ungetch((sign == -1) ? '-' : '+');
  return 0;
 }
 for (*pn = 0; isdigit(c); c = getch())
  *pn = 10 * *pn + (c - '0');
 *pn *= sign;
 if (c != EOF)
  ungetch(c);
 return c;
}
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