#include <stdio.h>
#include <math.h>
#include <string.h>
int dz(char b)
{        
        if((b>='a'&&b<='z')||(b>='A'&&b<='Z'))
            return(1);
        else
            return(0);
        
}


int longzf(char c[80])
{
    int i,kg=1,ld=0,ld1=0,dz2=0,dz1;
    for(i=0;i<=strlen(c);i++)
    {
        if(dz(c[i]))
        {
            if(kg)
            {
                dz2=i;
                kg=0;
            }
            else ld++;
        }
        else
        {
            kg=1;
            if(ld>ld1)
            {
                ld1=ld;
                ld=0;
                dz1=dz2;
            }
        }
    }
    return(dz1);
}



void main()
{
    char a[80];
    int i;
    gets(a);
    for(i=longzf(a);dz(a[i])!=0;i++)
        printf("%s\n",a);
}

目的是求字符中最长的单词 请高手们帮帮忙

for(i=longzf(a);dz(a[i])!=0;i++)
        printf("%s\n",a);  //应该是printf("%c",a[i]);

谢谢了