C++语言入门题目和解释

4、编写程序，运行时输入x，a,b,c,输出 y=ax2+bx+c,要求使用函数功能

#include <stdio.h>
int main()
{
    double x,a,b,c;
    double y;
    scanf("%lf %lf %lf %lf",&x,&a,&b,&c);
    y = a*x*x + b*x + c;
    printf("%lf",y);
    return 0;
}

楼上没读题吗？要求用函数写！！！

楼主可以看看我写的

#include <stdio.h>
double ans_Gaim_(double x, double a, double b, double c) {
    double ans_;
    ans_ = a * x * x + b * x + c;
    return ans_;
}
int main() {
    double x, a, b, c;
    double y;
    scanf ("%lf %lf %lf %lf", &x, &a, &b, &c);
    y = ans_Gaim_ (x, a, b, c);
    printf("%lf",y);
    return 0;
}