获取最长文本行

// 获取最长文本行#include <stdio.h>#define MAXLINE 10// maximum input line lengthint getline(char line[], int maxline);void copy(char to[], char from[]);// Print the largest input lineint main(){int len;// current line lengthint max;// maximum length seen so farchar line[MAXLINE];// current input linechar longest[MAXLINE];// longest line saved heremax = 0;while ((len = getline(line, MAXLINE)) > 0){// 输出行长度及行内字符串printf("length: %d, line: %s", len, line);// 当前遇到的最长字符行if (len > max){max = len;copy(longest, line);}}// 存在最长行if (max > 0){printf("The longest line : %s/n", longest);}return 0;}// getline: read a line into s (include '/n' and '/0'), return length int getline(char s[], int lim){int c, i, j;// 调用的时候实参是设定的最大长度，所以下面操作不会出现越界。// 此处是lim-2是因为还要存放最后一个'/n'和一个'/0'。// 此处j记录的是复制的字符个数，i只是记录了文本行的真实长度，// 但是要存放超出MAXLINE的字符还要多分配空间才可以，否则会越界j = 0;for (i = 0; (c = getchar()) != EOF && c != '/n'; ++i){if (i < lim -2){s[j] = c;++j;}}if (c == '/n'){s[j] = c;++j;++i;}s[j] = '/0';return i;}// copy: copy 'from' into 'to'; assume to is big enoughvoid copy(char to[], char from[]){int i;for (i = 0; (to[i] = from[i]) != '/0'; ++i);}