/* 
Accepts 4 numbers a, b, c, d as double and finding their arithmetic
mean (AM), geometric mean (GM) and harmonic mean (HM) and prints
the mean that is neither the largest nor the smallest (i.e.,
the middle value).
 * Author:rahule@cse.iitk.ac.in
 */

#include <stdio.h>
#include<math.h>
int main()
{
    double a,b,c,d,am,gm,hm; //variable initialization
    printf("\nEnter four numbers:");
    scanf("%lf%lf%lf%lf",&a,&b,&c,&d);
    am=(a+b+c+d)/4;     //finds Arithmatic mean using the formula AM=(a+b+c+d)/4
    gm=sqrt(sqrt(a*b*c*d));     //finds goematric mean using the formula GM=sqrt(sqrt(a*b*c*d))
    hm=4/((1/a)+(1/b)+(1/c)+(1/d));     //finds Harmonic mean.Alternately,if one knows AM and GM,harmonic mean can also be calulated as HM=GM^2/AM
    printf("\nArithmatic Mean:%lf\n",am);  printf("\nGeometric mean:%lf\n",gm);printf("\nHarmonic Mean:%lf\n",hm);
    printf("\nThe middle value is the ");
    
    if(((am<=gm)&&(gm<=hm))||((hm<=gm)&&(gm<=am)))    //if am<gm<hm OR hm<gm<am
        printf("Geometric Mean:%lf",gm);
    else if(((hm<=am)&&(am<=gm))||((gm<=am)&&(am<=hm)))  // if hm<am<gm OR gm<am<hm
        printf("Arithmatic Mean:%lf",am);
    else if(((am<=hm)&&(hm<=gm))||((gm<=hm)&&(hm<=am)))     //if am<hm<gm OR gm<hm<am
        printf("Harmonic Mean:%lf",hm);
    

}