C语言实现拷贝输入的最长的行

 

#include <stdio.h>#define MAXLINE1000 /*maximum input line size*/int getline(char line[], int maxline);void copy(char to[], char from[]);/*print longest input line*/main(){int len; /*current line length*/int max; /*maximum length seen so far*/char line[MAXLINE]; /*current input line*/char longest[MAXLINE]; /*longest line saved here*/max = 0;while((len = getline(line, MAXLINE)) > 0){if( len > max ){max = len;copy(longest, line);}}if( max > 0){ /*there was a line*/printf("%s", longest);}return 0;}/*getline : read a line into s, return length */int getline(char s[], int lim){int c, i ;for(i = 0; i < lim - 1 && (c = getchar()) != EOF && c != '\n'; i ++){s[i] = c;}if(c == '\n'){s[i] = '\n';i ++;}s[i] = '\0';return i ;}/*copy : copy 'from' into 'to' ; assume to is big enough*/void copy(char to[], char from[]){int i ;i = 0;while((to[i] = from[i]) != '\0')++i;}