c程序设计第四版谭浩强
写一个函数,输入一行字符,将此字符串中最长的单词输出。
【c源程序】
#include <stdio.h>
#include <string.h>
int main()
{int alphabetic(char);
int longest(char []);
int i;
char line[100];
printf("input one line:\n");
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);
}
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