c编程 求3个数中的较大数

main () {
float a,b,c,x;
printf ("a,b,c=");
scanf ("%f%f%f",&a,&b,&c);
if (b > a) {
x = a;
a = b;
b = x;
}
if (c > a) {
x = a;
a = c;
c = x;
}
if (c > b) {
x = b;
b = c;
c = x;
}
printf ("%f\n",a);
getch ();
}

#include <stdio.h>
void main()
{
float a,b,c,max;
printf("Please input 3 float number,seperate with ',':\n");
scanf("%f,%f,%f",&a,&b,&c);
if(a>b) max=a;
else max=b;
if(max<c) max=c;
printf("The max is %f",max);

}