Pfthb

input

R r
8 0
0 9.9
5 -1
3.8 7.2

its giving me these errors

main.cpp: In function ‘int main()’:
 main.cpp:31:26: warning: ‘radius’ may be used uninitialized in this function [-Wmaybe-uninitialized]
 } while (radius <= 1);
 ~~~~~~~^~~~
 main.cpp:40:24: warning: ‘length’ may be used uninitialized in this function [-Wmaybe-uninitialized]
 while (length <= 1 && width <= 1);
 ~~~~~~~^~~~
 main.cpp:40:38: warning: ‘width’ may be used uninitialized in this function [-Wmaybe-uninitialized]
 while (length <= 1 && width <= 1);
 ~~~~~~^~~~

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

// function prototype
double calculateArea(double);
double calculateArea(double, double);

int main()

 // variables
 char shape;
 double radius, length, width, area;

 do
 
 cin >> shape;
 
 while ( shape != 'c' && shape != 'r');

 if (shape == 'c')
 
 do
 
 //input value for radius and validate
 
 while (radius <= 1);

 // call calculate area with radius
 area =(calculateArea(radius));
 //output area
 cout << "Area of a circle with radius " << radius << " is " << area << endl;
 
 else // calculate the area of a rectangle
 
 // input values for length and width and validate them
 while (length <= 1 && width <= 1); 
 // call calculate area with length and width
 area = calculateArea(length, width);
 // output area
 cout << "Area of a rectangle with length " << length << " and width " << width << " is " << area << endl;
 
 return 0;


// functions 
double calculateArea(double radius)

 double area;
 area = 3.14159 * radius * radius;
 return area;


double calculateArea( double length, double width)

 double area;
 area = length * width;
 return area;

The error message is clear: radius (on if branch) and length and width may be used uninitialized (on else branch).

Check what are you parsing from user input.