c - 函数调用错误

Question

在终端中编译这段代码时，我收到一条错误消息:

newfile1.c:17: error: conflicting types for ‘average’
newfile1.c:2: note: previous declaration of ‘average’ was here

我看不出代码有什么问题。有人可以帮帮我吗？

enter code here
#include<stdio.h>
float average(float);
int main()
{
        float marks[4],avg;
        int i;
        printf("Please enter your marks\n");
        for(i=0;i<=3;i++)
        {
                scanf("%d",&marks[i]);
        }
        avg = average(marks[4]);
        printf("The average marks value is %f",avg);
        return 0;
}



float average(float a[4])
{
       int i,sum;
       float avg_m;
       for(i=0;i<=3;i++)
       {
               sum=sum+a[i];
       }
       avg_m=sum/3;
       return avg_m;
}

Answer 1

替换

float average(float);

与

float average(float[]);

函数声明和定义不匹配。

然后像这样调用函数:

avg = average(marks);