这怎么改？

独孤九剑贰 2013-06-22 12:36:39

这怎么改？？
#include <stdio.h>
#define MAXLINE 1000 /* maximum input line length */
int getline(char line[], int maxline);
void copy(char to[], char from[]);
/* print the 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] = c;
++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;
}
修改main函数，使得该程序可以打印任意长度的行。

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赵4老师 2013-06-24

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#include <stdio.h>
#include <string.h>
#define MAXLEN 1000
char ln[MAXLEN];
FILE *f;
int i,z;
int b,n,L;
int main(int argc,char **argv) {
    if (argc<2) {
        printf("Usage:%s fullpathfilename.ext\nget total blank/non-blank/total linenumbers.\n",argv[0]);
        return 1;
    }
    f=fopen(argv[1],"r");
    if (NULL==f) {
        printf("Can not open file [%s]!\n",argv[1]);
        return 2;
    }
    z=0;
    b=0;
    n=0;
    L=0;
    while (1) {
        if (NULL==fgets(ln,MAXLEN,f)) break;
        L=strlen(ln);
        if ('\n'==ln[L-1]) {
            if (0==z) {
                for (i=0;i<L-1;i++) {
                    if (!(' '==ln[i] || '\t'==ln[i])) break;
                }
                if (i<L-1) z=1;//当前行不是空行
            }
            if (0==z) b++; else n++;
            z=0;
        } else {
            if (0==z) {
                for (i=0;i<L;i++) {
                    if (!(' '==ln[i] || '\t'==ln[i])) break;
                }
                if (i<L) z=1;//当前行不是空行
            }
        }
    }
    fclose(f);
    if (L>0 && '\n'!=ln[L-1]) {
        if (0==z) b++; else n++;//最后一行末尾无'\n'也计算
    }
    printf("File:[%s] total blank/non-blank/total linenumbers is %d/%d/%d\n",argv[1],b,n,b+n);
    return 0;
}