C Programming (K&R) – Ch 2

Day 1

Today I just read up to Section 2.7 and did the first two exercises. They weren’t all that interesting. The chapter thus far is just a review of the types and such. Here’s my solution for Exercise 2.2. I could have used an enum but I prefer a simple flag which I called done.

#include <stdio.h>
/*
Exercise 2-2. Write a loop equivalent to the for loop above without using && or ||.
for (i=0; i < lim-1 && (c=getchar()) != '\n' && c != EOF; ++i)
    str[i] = c;
*/

#define MAXLINE 1000

int main() {
  char s[MAXLINE];
  const int lim = MAXLINE;
  int c, i, done;

  for (i = 0, done = 0; done == 0; ++i) {
    if (i >= lim - 1) {
      done = 1;
    } else if ((c = getchar()) == EOF) {
      done = 1;
    } else if (c == '\n') {
      done = 1;
    } else {
      s[i] = c;
    }
  }
  s[i-1] = '\0';

  printf("%s\n", s);

  return 0;
}