Question

Write a menu driven program in C++ to calculate the simple interest or compound interest depending
upon the user’s choice. Write and use functions to calculate simple interest and compound interest.

Answer 1

#include <iostream>using namespace std;int main(){   //global variables   int ch=-1;   double P;   double j;   int m;   int t;   double S;   double SI;   do{      while(ch<1 || ch>3){         //show menu         cout<<"1 - Simple interest\n";         cout<<"2 - Compound interest\n";         cout<<"3 - Exit\n";         cout<<"Your choice: ";         cin>>ch;         switch(ch){            case 1:               //Principal or Sum [P]     =                cout<<"Enter principal amount: ";               cin>>P;               //Rate % per Annum [j]     =  %                cout<<"Enter interest rate: ";               cin>>j;               //Time [T]     =                  cout<<"Enter time: ";               cin>>t;               //Simple Interest [S.I.]               SI=(P*j*t)/100;               //show result               cout<<"Simple Interest: "<<SI<<"\n\n";               break;            case 2:               //P = principal amount (initial investment)               cout<<"Enter principal amount: ";               cin>>P;               //j = annual nominal interest rate (not reflecting the compounding)               cout<<"Enter an annual nominal interest rate: ";               cin>>j;               //m = number of times the interest is compounded per year               cout<<"Enter the number of times the interest is compounded per year: ";               cin>>m;               //t = number of years the money is borrowed for               cout<<"Enter the number of years the money is borrowed for: ";               cin>>t;               //S = value after t periods               S=P*pow((1+j/m),m*t);               //show result               cout<<"Future Value: $"<<S<<"\n\n";               break;            case 3:               break;         }      }   }while(ch!=3);   return 0;}