compound Interest

setup Form

btnShow

• for loops: specified number of iterations
• do-while loops: post-test condition, so will always run 1 or more times
• while-do loops: pre-test condition, so could run 0 or more times
• recursion: invoked method that invokes itself from within itself

int principal = 1000; //invest $1000
double rate = 0.10; //at 10% per annum
int time = 5; //for 2 years
double final_amount = 0; //total after investing
int counter = 0; //counter to control loops
    
      
//FOR LOOP--------------->
final_amount = principal;
for(counter = 1; counter <= time; counter++){
  final_amount = final_amount + (final_amount * rate);
}
lblForLoop.setText(String.valueOf(final_amount));
//----------------------->        
      
      
//DO WHILE--------------->
final_amount = principal;
counter = 1;
do{
  final_amount = final_amount + (final_amount * rate);
  counter++;
} while (counter <= time);
lblDoWhile.setText(String.valueOf(final_amount));
//----------------------->            
          
          
//WHILE DO--------------->
final_amount = principal;
counter = 1;
while(counter <= time){
  final_amount = final_amount + (final_amount * rate);
  counter++;
}
lblWhileDo.setText(String.valueOf(final_amount));
//----------------------->            
          
          
//RECURSION (HIGHER DIFFICULTY)--------------->
final_amount = compound(principal, rate, time);
lblRecursion.setText(String.valueOf(final_amount));
//-------------------------------------------->

create recursive method

• recursion is like inception. google it. put this were you would normally declare sub-methods for your class (outside your button event handler).

public double compound(double p, double r, int t){
if (t == 0)
    {
        return p;
    }
        else
    {
        return (compound(p + (p * r), r, t-1));
    }
}