一个问题不知道什么原因

#include
#define N 40
int Average (int score[],int n);
void ReadScore(int score[],int n);
int main()
{
int score[N],aver,n;
printf("Input n:");
scanf("%d",&n);
ReadScore(score,n);
aver = Average(score,n);
printf("Average score is %d\n",aver);
return 0;
}
int Average (int score[],int n)
{
int i,sum = 0;
for(i = 0;i < n;i++)
{
sum +=score[i];
}
return sum/n;
}
void Readscore(int score[],int n)
{
int i;
printf("Input score:");
for(i = 0;i < n;i++)
{
scanf("%d",&score[i]);
}
}

1.提示[error]ID returned 1 exit status
请问为什么

ReadScore函数申明时S是大写，但下面实现是函数名中s是小写，不是同一个函数