Nov 15, 2011

K & R C Programs Exercise 1-19

K and R C, Solution to Exercise 1-19:
Write a function reverse(str) that reverses the character string str. Use it to write program that reverse thes its input a line at a time. K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language, second addition, by Brian W.Keringhan and Dennis M.Ritchie(Prentice Hall,1988). You can learn and solve K&R C Programs Exercise. Read more about C Programming Language .


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#include "stdio.h"

#define MAXINLINE 1000 /* maximum input line size */

int get_lines(char line[], int maxline);
void reverse(char str[]);

/* print longest input line */
main() {

 char line[MAXINLINE]; /* current input line */

 while ((get_lines(line, MAXINLINE)) > 0) {

  reverse(line);
  printf("%s", line);

 }

}

/* getline: read a line into s, return length */
int get_lines(char str[], int line) {
 int c, i, j;

 for (i = 0, j = 0; (c = getchar()) != EOF && c != '\n'; ++i) {
  if (i < line - 1) {
   str[j++] = c;
  }
 }
 if (c == '\n') {
  if (i <= line - 1) {
   str[j++] = c;
  }
  ++i;
 }
 str[j] = '\0';
 return i;
}

/*reverse the string str*/
void reverse(char str[]) {
 int i, j;
 char temp;
 i = 0;
 while (str[i] != '\0')
  ++i;
 --i;
 if (str[i] != '\n')

  --i;
 j = 0;
 while (j < i) {
  temp = str[j];
  str[j] = str[i];
  str[i] = temp;
  --i;
  ++j;
 }
}

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