Program Flow
I can not seem to get this program to work. The logic may be my problem and the ranges between 0-672 will not work when the user enters a -number.
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#include<iostream>
#include<cctype>
using namespace std;
int main()
{
char package;
double units;
double fees_a, fees_b, fees_c;
int A, B, C, Q;
double pac_a,pac_b, pac_c;
do
{
cout <<"Which pakage are you shopping for?:Please enter A, B, C, or Q to quit."<< endl;
cin>> package;
package = toupper(package);
}while(package !='A' && package !='B' && package !='C' && package !='Q');
do
{
cout<<"How many message units?:"<<endl;
cin>>units;
}while(units < 0 || units > 672);
switch(package)
{
case 'A':
if (units <=10)
{
fees_a = 9.95;
cout<<"The charges are:"<< fees_a<< endl;
}
else
{
fees_a = (units - 10) * 2 + 9.95;
cout<<"The charges are:"<< fees_a<< endl;
}
break;
case 'B':
if (units <= 20)
{
fees_b = 19.95;
cout<<"The charges are:"<< fees_b<< endl;
break;
}
else
{
fees_b = ((units - 20) + 19.95);
cout<<"The charges are:"<< fees_b<< endl;
}
break;
case 'C':
fees_c = 39.95;
cout<<"The charges are:"<< fees_c<< endl;
break;
case 'Q':
cout<<"Thank you for using this program. Goodbye."<< endl;
return 0;
break;
default:
cout<<"Enter only 0 through 672."<<endl;
}
if(fees_a < fees_b && fees_a < fees_c)
{
cout<<"Package A is a better plan"<< endl;
}
else if(fees_b < fees_c)
{
pac_b = (fees_a - units + 19.95) +20;
pac_c = (fees_a - 39.95);
cout<<"By switching to package B you would save:$"<<pac_b<<endl;
cout<<"By switching to package C you would save:$"<<pac_c<<endl;
}
else
{
cout<<"Package C is a better plan"<<endl;
}
return 0;
}
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I don't know what you are doing, but that's what you are declaring
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do
{
...
}
while(units < 0 || units > 672);
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that condition is true and keeps the do-while going only when
units stores a value that is less than 0 or higher than 672.
basically your do-while executes at least 1 time no matter what is the value of
units and then it checks that condition.
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