C语言输出最长的单词

Question

#include<stdio.h>
#include<string.h>
int main()
{
int alphabetic(char);
int longest(char[]);
int i;
char line[100];

gets(line);
printf("The Longest word is: ");
for(i=longest(line);alphabetic(line[i]);i++)
printf("%c",line[i]);
printf("\n");
return 0;
}
int alphabetic(char c)
{
if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
return(1);
else
return(0);
}
int longest(char string[])
{
int len=0,i,length=0,flag=1,place=0,point;
for(i=0;i<=strlen(string);i++)
if(alphabetic(string[i]))
if(flag)
{
point=i;
flag=0;
}
else
len++;
else
{
flag=1;
if(len>=length)
{
length=len;
place=point;
len=0;
}
}
return(place);
}

Answer 1

修改如下，供参考：

#include<stdio.h>
#include<string.h>
int main()
{
    int alphabetic(char);
    int longest(char[]);
    int i,j,k=0,maxlen,length=0,flag=1,place=0,point;
    char line[100];

    gets(line);
    maxlen = longest(line);
    printf("The Longest word is: ");
    for(j=0;line[j];j++)
    {
        if(alphabetic(line[j])){
            if(flag)
            {
                point=j;
                flag=0;
            }
            length++;
        }
        else
        {
            flag=1;
            if(maxlen == length)
            {
                if (k++) printf(" ");
                for(i=point;alphabetic(line[i]);i++)
                     printf("%c",line[i]);
            }
            length=0;
        }
    }
    if(maxlen == length)
    {
        if (k++) printf(" ");
        for(i=point;alphabetic(line[i]);i++)
            printf("%c",line[i]);
    }
    printf("\n");
    return 0;
}
int alphabetic(char c)
{
    if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
        return(1);
    else
        return(0);
}
int longest(char str[])
{
    int len=0,i=0,length=0,flag=1,place=0,point;
    for(i=0;str[i];i++)
    {
        if(alphabetic(str[i]))
        {
            if(flag)
                flag=0;
            len++;
        }
        else
        {
            flag=1;
            if(len > length)
                length=len;
            len=0;
        }
    }
    if (len > length)  length=len;
    return length; //return(place);
}