江湖救急！！！！！！c语言！！！！！！帮毛改一下

#include <stdio.h>
#include<math.h>
#include<stdlib.h>
int main ()
{
float det2(float,float,float,float);//建议：没有返回值就把float写成void
float det3(float,float,float,float,float,float,float,float,float);//建议1：下面det3有9个参数，这里只有6个这里加三个float；建议2：没有返回值就把float写成void

float a11,a12,a13,a21,a22,a23,a31,a32,a33;

printf ("\nenter the number for the a11 a12 a13:");//建议：不用以来就空格吧
scanf ("%f%f%f",&a11,&a12,&a13);
printf ("\nenter the mnmber for the a21 a22 a23:");
scanf ("%f%f%f",&a21,&a22,&a23);
printf ("\nenter the number for a31 a32 a33:");
scanf ("%f%f%f",&a31,&a32,&a33);

det2(a11,a22,a12,a21);
det3(a11,a12,a13,a21,a22,a23,a31,a32,a33);

system("pause");
return 0;
}

void det2(float a11,float a22,float a12,float a21)<