c语言函数

#include <iostream>
float average();//主函数在前需要申明
int main()
{
    float x;
    x = average();
    printf("平均值为:%5.2f\n", x);
    return 0;

}
float average()
{
    float x1, x2, x3, x4, x5;
    printf("请输入五个数:");
    scanf_s("%f%f%f%f%f", &x1, &x2, &x3, &x4, &x5);
    return((x1 + x2 + x3 + x4 + x5) / 5);


}。

#include <iostream>
float average(float x1, float x2, float x3, float x4, float x5)
{


	return((x1 + x2 + x3 + x4 + x5) / 5);


}


int main()
{
	float a,a1,a2,a3,a4,a5;
	printf("请输入五个数:");
	scanf_s("%f%f%f%f%f", &a1, &a2, &a3, &a4, &a5);
	a = average( a1,a2,a3,a4,a5);
	printf("平均值为:%5.2f\n", a);
	return 0;

}