错误代码请求改正，问题如下

Question

#include<stdio.h>
#include<math.h>
double funF(double a)
{
double m;
printf("%.2lf",fabs(a-3)+fabs(a+1));
}
double funG(double x)
{
double a;
a=xx-3x;
funF(a);
}
int main(double m,double a)
{
double x;
scanf("%lf",x);
funG(x);
funF(a);
}
输入值后，无结果

Answer 1

scanf("%lf", &x);