My Interest Calculator. [C++]
Very simple, only took me about 45 minutes to make.
Tell me if there are any glitches.
Make sure you've got the C++ runtime files.
Yes, I know it's a console application.
Tell me of any glitches you find.
Download: project2.zip
(make sure you extract it)
Source Code ( you can steal, don't really care )
Code:
#include <iostream.h>
#include <math.h>
void anually(double principal, double rate, double years, double leftover)
{
cout<<"You have chosen anually."<<endl;
cout<<"Final account balance after " <<years<<" years is: "<<principal*pow((1+(rate/100)/1), 1*years)<<endl;
leftover= principal*pow((1+(rate/100)/1), 1*years);
cout<<"Interest accrued: "<<leftover - principal<<endl;
}
void semianually(double principal, double rate, double years, double leftover)
{
cout<<"You have chosen semianually."<<endl;
cout<<"Final account balance after " <<years<<" years is: "<<principal*pow((1+(rate/100)/2), 2*years)<<endl;
leftover= principal*pow((1+(rate/100)/2), 2*years);
cout<<"Interest accrued: "<<leftover - principal<<endl;
}
void quart(double principal, double rate, double years, double leftover)
{
cout<<"You have chosen quarterly."<<endl;
cout<<"Final account balance after " <<years<<" years is: "<<principal*pow((1+(rate/100)/4), 4*years)<<endl;
leftover= principal*pow((1+(rate/100)/4), 4*years);
cout<<"Interest accrued: "<<leftover - principal<<endl;
}
void month(double principal, double rate, double years, double leftover)
{
cout<<"You have chosen monthly."<<endl;
cout<<"Final account balance after " <<years<<" years is: "<<principal*pow((1+(rate/100)/12), 12*years)<<endl;
leftover= principal*pow((1+(rate/100)/12), 12*years);
cout<<"Interest accrued: "<<leftover - principal<<endl;
}
void weekly(double principal, double rate, double years, double leftover)
{
cout<<"You have chosen weekly."<<endl;
cout<<"Final account balance after " <<years<<" years is: "<<principal*pow((1+(rate/100)/52), 52*years)<<endl;
leftover= principal*pow((1+(rate/100)/52), 52*years);
cout<<"Interest accrued: "<<leftover - principal<<endl;
}
void daily(double principal, double rate, double years, double leftover)
{
cout<<"You have chosen daily."<<endl;
cout<<"Final account balance after " <<years<<" years is: "<<principal*pow((1+(rate/100)/365), 365*years)<<endl;
leftover= principal*pow((1+(rate/100)/365), 365*years);
cout<<"Interest accrued: "<<leftover - principal<<endl;
}
void contin(double principal, double rate, double years, double leftover)
{
cout<<"You have chosen continuously."<<endl;
cout<<"Final account balance after "<<years<<" years is: "<<principal*pow(2.71828183,((rate/100)*years))<<endl;
leftover=principal*pow(2.71828183,((rate/100)*years));
cout<<"Interest accrued: "<<leftover - principal<<endl;
}
void ntimes(double principal, double rate, double years, double leftover, double nt)
{
cout<< "Enter number of times compounded per year: ";
cin>>nt;
cout<< "Final account balance after "<<years<<" years is: "<<principal*pow((1+(rate/100)/nt), nt*years)<<endl;
leftover=principal*pow((1+(rate/100)/nt), nt*years);
cout<<"Interest accrued: "<<leftover - principal<<endl;
}
int main()
{
double principal, rate, years, op, leftover, nt;
cout<<" Interest Calculator."<<endl;
cout<<" Made by Robyn :)"<<endl<<endl;
cout<<"This is a simple program that calculates interest."<<endl;
cout<<"For the most part, it's self explanitory, just input your values when prompted."<<endl;
cout<<"Hit enter after you input something to continue to the next step."<<endl;
cout<<"-------------------------------------------------------------------------------"<<endl;
cout<<endl;
while(op!=9)
{
cout<<"Enter a starting balance: ";
cin>>principal;
while(principal<1)
{
cout<<"You probably want to start out with at least 1 dollar. Just a guess."<<endl;
cout<<"So, try again: ";
cin>>principal;
cout<<endl;
}
cout<<"Enter percent interest rate: ";
cin>>rate;
while(rate<.1)
{
cout<<"You probably want to have more than a 0% interest rate. Just a guess"<<endl;
cout<<"So, try again: ";
cin>>rate;
cout<<endl;
}
cout<<"Enter number of years in the account: ";
cin>>years;
while(years<.003)
{
cout<<"You probably want to have it for at least a day. Just a suggestion."<<endl;
cout<<"So, try again: ";
cin>>years;
cout<<endl;
}
cout<<"Select number of times per year interest is compounded:"<<endl;
cout<<" 1. Anually"<<endl;
cout<<" 2. Semianually"<<endl;
cout<<" 3. Quarterly"<<endl;
cout<<" 4. Monthly"<<endl;
cout<<" 5. Weekly"<<endl;
cout<<" 6. Daily"<<endl;
cout<<" 7. Continuously"<<endl;
cout<<" 8. Another amount"<<endl;
cout<<" OR"<<endl;
cout<<" 9. Quit the program"<<endl;
cout<<"Choice: ";
cin>>op;
cout<<endl;
if(op==1)
{
anually(principal, rate, years, leftover);
cout<<endl;
}
else if(op==2)
{
semianually(principal, rate, years, leftover);
cout<<endl;
}
else if(op==3)
{
quart(principal, rate, years, leftover);
cout<<endl;
}
else if(op==4)
{
month(principal, rate, years, leftover);
cout<<endl;
}
else if(op==5)
{
weekly(principal, rate, years, leftover);
cout<<endl;
}
else if(op==6)
{
daily(principal, rate, years, leftover);
cout<<endl;
}
else if(op==7)
{
contin(principal, rate, years, leftover);
cout<<endl;
}
else if(op==8)
{
ntimes(principal, rate, years, leftover, nt);
cout<<endl;
}
else if(op<1||op>9)
{
cout<<"No, only an option 1-9. The program will now restart."<<endl;
cout<<endl;
}
system ("PAUSE");
cout<<endl;
}
return 0;
}
