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);


}。

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#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;   }