为什么这里会报错，怎么改

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
int score[100] = { 0 };
int count[100] = {0};
int i, STUDENTS;
STUDENTS = 40;
srand(unsigned(time(NULL)));~~~错误提示行
for (i = 0; i < STUDENTS; i++)
{
score[i] = rand() % 10 + 1;
count[score[i]] ++;
}
printf("Grade\tCount\tHistogram\n");
int h, k;
for (k = 1; k <= 10;k++)
{
printf("%d\t%d\t", k, count[k]);
for (h = 1; h <=count[k]; h++)
{
printf("%c",'*');
}
printf("\n");
}
return 0;
}

srand(time(0));