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  1. #include <iostream>
  2. #include <iomanip>
  3.  
  4. using namespace std;
  5.  
  6. int main()
  7.  
  8. {
  9.     int n;
  10.  
  11.     cout << "Geometry Calculator" <<endl <<endl;
  12.     cout << "1. Calculate the Area of a Circle" <<endl;
  13.     cout << "2. Calculate the Area of a Rectangle" <<endl;
  14.     cout << "3. Calculate the Area of a Triangle" <<endl;
  15.     cout << "4. Quit" <<endl;
  16.  
  17.     cout << "Enter 1,2,3, or 4: ";
  18.     cin >> n;
  19.  
  20.     if (n==1) 
  21.  
  22.    {    
  23.        float pi= 3.14159;
  24.        float r;
  25.  
  26.        cout <<"Enter the radius of the circle: ";
  27.        cin >> r;
  28.  
  29.        if(r<0)
  30.           { cout << "ERROR! Enter a positive number.\n";}
  31.  
  32.        if (r>0)
  33.        cout << "The area of the circle is " <<fixed <<setprecision(2) << (2*pi*r) << " square\n";
  34.    } 
  35.  
  36.     if (n==2)
  37.  
  38.     {
  39.        float l,w;
  40.  
  41.        cout << "Enter the length of the rectangle: ";
  42.        cin >> l;
  43.  
  44.        if(l<0)
  45.            {cout << "ERROR!Enter a positive number.\n";}
  46.  
  47.        cout << "Enter the width of the rectangle: ";
  48.        cin >> w;
  49.  
  50.        if(w<0)
  51.            {cout << "ERROR! Enter a positive number.\n";}    
  52.  
  53.        if (l>=0&&w>=0)
  54.        cout << "The area of the rectangle is " << l*w << " sqaure\n";
  55.        else if (l<0||w<0)
  56.        cout << "Error! Enter a positive number.";
  57.  
  58.     } 
  59.  
  60.     if (n==3)
  61.  
  62.     {
  63.        float base,height;
  64.  
  65.        cout <<"Enter the base of the triangle: ";
  66.        cin>> base;
  67.              if(base<0)
  68.                    { cout <<"ERROR! Enter a positive number.\n";}
  69.  
  70.         cout <<"Enter the height of the triangle: ";
  71.         cin>> height;
  72.  
  73.        if(height<0)
  74.            {cout << "ERROR! Enter a positive number.\n";}
  75.  
  76.  
  77.        if (base>=0&&height>=0)
  78.        cout << "The area of the triangle is " << base*height <<" square\n";
  79.        else if (base<0||height<0)
  80.        cout << "Error! Enter a positive number.";
  81.  
  82.     }
  83.     if (n==4)
  84.             {cout << "End of program.\n";}
  85.     if (n>=5||n<=0)
  86.             {cout << "Not in range!!!\n";}
  87. return 0;
  88. }
  89.  
Success #stdin #stdout 0s 3144KB
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Standard input is empty
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Geometry Calculator

1. Calculate the Area of a Circle
2. Calculate the Area of a Rectangle
3. Calculate the Area of a Triangle
4. Quit
Enter 1,2,3, or 4: Not in range!!!
https://ideone.com/UB3to0
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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