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定义一个大小为10的数组，统计10个分数值的次数即可。

#include <stdio.h>
int main()
{
    int a[10] = {0};
    int sum = 0,i,j,score;
    for(i=0;i<50;i++)
    {
        scanf("%d",&score);
        sum += score;
        a[score-1]++;
    }
    printf("The average score is %.1f\n\n",sum/50.0);
    printf("%10s%10s%s\n","Score","Count","Histogram");
    for(i=0;i<10;i++)
    {
        printf("%-10d%-10d",i++,a[i]);
        for(j=0;j<a[i];j++)
            printf("*");
        printf("\n");
    }
    return 0;
}