K&R C Exercise 1-19 Solution

/* * Exercise 1-19 Write a function reverse(s) that reverses * that character string s. Use it to write a program that * reverses its input a line at a time. * * fduan, Dec. 11, 2011  */#include <stdio.h>#define MAX_LEN 1000int getline( char line[], int max_len );void reverse( char line[] );int main(){char line[MAX_LEN];int len;while( ( len = getline( line, MAX_LEN ) ) > 0 ){if( len > 0 )reverse( line );printf( "%s", line );}return 0;}int getline( char line[], int max_len ){int c, i, j;i = j = 0;while( ( c = getchar() ) != EOF && c != '\n' ){if( i < max_len - 2 )line[j++] = c;++i;}if( c == '\n' ){line[j++] = c;++i;}line[j] = '\0';return i;}void reverse( char line[] ){int i, j;char tmp;i = j = 0;while( line[j] != '\n' )++j;for( --j; i < j; ++i, --j ){tmp = line[i];line[i] = line[j];line[j] = tmp;}}