C++ code to calculate body fat of a person (Logic explained)

Here is the C++ code to calculate body fat of a person  . It works by inputting some necessary data of person. You all should have in mind how it works exactly. Here is the algorithm.

  Steps

User side

1: User asked for his/her gender

2: User asked to enter body-weight 

3: User asked to enter wrist measurement 

4: User asked to enter waist measurement

5: User asked to enter hip measurement

6: User asked to enter forearm measurement

7: User displayed body fat

8: User displayed body fat percentage

9: Program ends here

Developer side

1: Declare variables that are going to be used in program .

2: Input gender from user (because there are different formulas for different genders)

3: If User is woman follow this

 Input enter body-weight (Calculate  A1=(bodyweight*0.732)+8.987;)

 Input wrist measurement (Calculate  A2=(wrist)/3.140;) 

 Input waist measurement (Calculate   A3=(waist)*0.157;)

 Input  hip measurement (Calculate   A4=(hip)*0.249;)

 Input  forearm measurement (Calculate   A5=(forearm)*0.434;)

  Know calculate following :  B=A1+A2-A3-A4+A5;

                         bodyfat=bodyweight-B;

                     

4:  If user is man then follow this

    Input body-weight (Calculate  A1=(bodyweight*1.082)+94.42;)

    Input wrist measurement (Calculate A2=(wrist)*4.15;)

    Know calculate following 

                            B=A1-A2;

                           bodyfat=bodyweight-B;

5: Calculate percentage body fat (To calculate percentage body fat use this formula  bodyfatparcentage=(bodyfat*100)/bodyweight;)

5: Output results 

6: Program ends here.

Here is the C++ code.

Code:

#include<iostream>

using namespace std;

void main()

{      char gender;

       float bodyweight,wrist,waist,hip,forearm;

       float A1,A2,A3,A4,A5,B,bodyfat,bodyfatparcentage;

       cout<<"\t\tThis program is to calculate the body fat of a person"<<endl;

       cout<<"If you are woman than press \'w\' . If you are man than press \'m\'  "<<endl;

       cin>>gender;

       switch(gender)

       {

                     case 'w':

             

                     cout<<"Enter your body weight ";

                     cin>>bodyweight;

                     A1=(bodyweight*0.732)+8.987;

                     cout<<"Enter your wrist measurement ";

                     cin>>wrist;

                     A2=(wrist)/3.140;

                     cout<<"Enter your waist measurement ";

                     cin>>waist;

                     A3=(waist)*0.157;

                     cout<<"Enter your hip measurement ";

                     cin>>hip;

                     A4=(hip)*0.249;

                     cout<<"Enter your forearm measurement ";

                     cin>>forearm;

                     A5=(forearm)*0.434;

                     //calculting B

                     B=A1+A2-A3-A4+A5;

                     bodyfat=bodyweight-B;

                     cout<<"Body Fat is equal to = "<<bodyfat<<endl;

                     bodyfatparcentage=(bodyfat*100)/bodyweight;

                     cout<<"Body Fat percentage is equal to = "<<bodyfatparcentage<<"%"<<endl;

             

              break;

       case 'm':

                    

                           cout<<"Enter your body weight ";

                           cin>>bodyweight;

                           A1=(bodyweight*1.082)+94.42;

                           cout<<"Enter your wrist measurement ";

                           cin>>wrist;

                           A2=(wrist)*4.15;

                           B=A1-A2;

                           bodyfat=bodyweight-B;

                           cout<<"Body Fat is equal to = "<<bodyfat<<endl;

                           bodyfatparcentage=(bodyfat*100)/bodyweight;

                            cout<<"Body Fat percentage is equal to = "<<bodyfatparcentage<<"%"<<endl;

                     break;

       default:

        cout<<"wrong input"<<endl;

       }

       system("pause");

}

Output: