C Program function to return the maximum of three numbers

It accepts three parameters  x,y, and z, each of type double and returns a value of type double.

A local variable max is used to hold the maximum of the three given numbers. Initially, the larger of x and y is stored in variable max using an if-else statement. Then the value of z is assigned to max if it is greater than max. Finally, the value of max is returned. A function to return the maximum of three numbers is given below.

#include<stdio.h>
double max3(double x,double y,double z);
void main () {
 double i;
 double a,b,c;
 clrscr();
 printf("Enter the value of x,y,z:\n");
 scanf("%lf%lf%lf",&a,&b,&c);
 i= max3(a,b,c) ;
 printf("%lf",i);
 getch();
}
double max3(double x,double y,double z) {
 double max;
 if (x > y)
   max = x;
 else max = y;
 if (z > max)
   max = z;
   return max;
}