程序代码：

#include<stdio.h>
#include<ctype.h>
#define MAXHIST 15
#define MAXWORD 11
#define IN       1
#define OUT      0
main()
{
    int c,i,nc,state;
    int len;
    int maxvalue;
    int ovflow;
    int wl[MAXWORD];
    state=OUT;
    nc=0;
    ovflow=0;
    for(i=0;i<MAXWORD;++i)
        wl[i]=0;
    while((c=getchar())!=EOF)
    {
        if(c==' '||c=='\n'||c=='\t')
        {
            state=OUT;
            if(nc>0)
                if(nc<MAXWORD)
                    ++wl[nc];
                else
                    ++ovflow;
                nc=0;
        }
        else if(state==OUT){
            state=IN;
            nc=1;
        }else
            ++nc;
    }
    maxvalue=0;
    for(i=1;i<MAXWORD;++i)
        if(wl[i]>maxvalue)
            maxvalue=wl[i];
        for(i=1;i<MAXWORD;i++)
        {
            printf("%5d-%5d:",i,wl[i]);
            if(wl[i]>0)
            {
                if((len=wl[i]*MAXHIST/maxvalue)<=0)
                    len=1;
            }
            else
                len=0;
            while(len>0)
            {
                putchar('*');
                --len;
            }
            putchar('\n');
        }
        if(ovflow>0)
            printf("There are %d words>=%d\n",ovflow,MAXWORD);
}