C :

#include<stdio.h>
#define M 40
#define N 11
int main()
{
	int i,j,grade,feedback[M],count[N]={0};
	for(i=0;i<M;i++)
	{
		scanf("%d",&feedback[i]);
	}
	for(i=0;i<M;i++)
	{
		switch(feedback[i])
		{
			case 1:count[1]++;break;
			case 2:count[2]++;break;
			case 3:count[3]++;break;
			case 4:count[4]++;break;
			case 5:count[5]++;break;
			case 6:count[6]++;break;
			case 7:count[7]++;break;
			case 8:count[8]++;break;
			case 9:count[9]++;break;
			case 10:count[10]++;break;
			default:printf("input error!\n");
		}
	}
	printf("Grade   Count   Histogram\n");
	for(grade=1;grade<=N-1;grade++)
	{
		printf("%-8d%-8d",grade,count[grade]);
		for(j=0;j<count[grade];j++)
		{
			printf("%c",'*');
		}
		printf("\n");
	}
	return 0;
}