Question

C++ programming question will upvote

A) One of the problems that have been discussed in the class is to write a simple C++ program to determine the area and circumference of a circle of a given radius. In this lab you will be rewriting the program again but this time you will be writing some functions to take care of the user input and math. Specifically, your main function should look like the following int main //the radius of the circle //the area of the circle double radius; double area; double circumference;//the circumference of the circle //get the value of the radius from the user radius -getRadius ) //determine the area and circumference area - findArea (radius); circumference-findCircumference (radius) //output the results cout <K "A circle of radius"<< radius<<"has an area of: " << area <<endl; cout << "and a circumference of: "<< circumference << endl; system (" PAUSE") return 0 Your job will be to write these three functions 1) getRadius This function should ask the user to enter the value for the radius and return that value 2) findArea This function should take the radius as a parameter and calculate and return the area. (Hint: area-3.14159*radius*radius) 3) findCircumference This function should take the radius as a parameter and calculate and return the circumference (Hint: circumference 2*3.14159*radius) OPTIONAL: Use prototypes for your functions. Place the prototypes before main (but after the using namespace std; line) and place the actual functions after the main function A sample run of your program should look like this (bold bracketed text stands for user input)

Answer 1

I have done both this problems. I hope that you wanted it.if you need further help please let me know. I have added comments where it necessary. If you still have problem please let me know by leaving comments.

Program for area calculation------------------------------------

#include<iostream>
using namespace std;
/*Function prototypes*/
double getRadius();
double findArea(double);
double findCircumference(double);

int main(){
   double radius;
   double area;
   double circumference;
  
   radius=getRadius(); /*calling getradius function which takes input from user*/
  
  
   area=findArea(radius);/*calling find area function which calculate area of circle*/
   circumference=findCircumference(radius);/*calling findcircumference function which calclate circumference*/
  
   cout<<"A circle of radius "<<radius<<" has area of: "<<area<<endl;/*endl for new line*/
   cout<<"and a circumference of: "<<circumference<<endl;
  
   system("PAUSE");
   return 0;
}
double getRadius(){/*radius has double data type thats why return type should be double*/
   double radius;/*local radius variale which hold the value from user and it returns a valule to main progrm*/
   cout<<"Enter the Radius of Circle: ";
   cin>>radius;/*Reading input from user*/
   return radius;/*Returning radius to main program*/
}

double findArea(double radius){ /*findArea function takes parameter radius and calculate area and reutrun value to main function, over here return type is double because area's data type is double*/
   double area; /*local area variale which hold the value of area(calculation) and it returns a valule to main progrm*/
    area=3.14159*radius*radius;/*calculating area*/
   return area;/*Returning area to main function*/
}

double findCircumference(double radius){
   double circumference; /*local circumference variale which hold the value of circumference(calculation) and it returns a valule to main progrm*/
   circumference=2*3.14159*radius; /*calculating circumference*/
   return circumference; /*returning circumference to main program*/
  
}

Program for net pay-----------------

#include<iostream>
#include<iomanip>
using namespace std;

void printDescription();
void computePaycheck(float,int,float&,float&);

int main(){
   float payRate;
   float grossPay;
   float netPay;
   int hours;
   cout<<setprecision(2)<<fixed;/*to represent floating point number upto 2 decimal point with fixed notation*/
   cout<<"Welcome to the PayRoll Program"<<endl;
  
   printDescription();
  
   cout<<"Please input the pay per hour"<<endl;
   cin>>payRate; /*Reading input payrate*/
   cout<<endl<<"Please input the number of hours worked"<<endl;
   cin>>hours;/*Reading input hours*/
   cout<<endl<<endl;
   computePaycheck(payRate,hours,grossPay,netPay);/*calling compute paycheck in which two parameter payrate and hours are passed by value while gross pay and netpay variale are pass by referance(or in aother words we are passing address of grossPay and nrtpay variable hence any change made in this variable in called function reflacted in main)*/
   cout<<"The gross pay is: $"<<grossPay<<endl;/*printing gross pay*/
   cout<<"The netpay is: $"<<netPay<<endl;/*printing net pay*/
  
  
  
}
void printDescription(){/*Just display function*/
   cout<<"***************************************************************"<<endl<<endl;
   cout<<"This program takes two numbers (Payrate & hours )"<<endl;
   cout<<"and multiplies them to et gross pay"<<endl;
   cout<<"it than calculate net pay by substracting 15%"<<endl;
   cout<<"***************************************************************"<<endl<<endl;
}
void computePaycheck(float rate,int hours,float& gross, float& net){/*function defination in which rate=payrate and hours=hours, while gross is alias to Grosspay it looks like (float& gross= grossapay hence gross and grossPay referes to same address hance any change made into gross reflacted in grossPay, simmilary for net*/
   gross=rate*hours;/*calculating gross pay by multiplying rate/hours and hours*/
   net=0.85*gross;/*net pay is 15% less what he/she earned hence (1-0.15=0.85) and multiplying with gross pay*/
}

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