Recently I found myself calculating interest and interest duration, I heaven’t found any decent tool for this so I did one by myself in C++. It does nothing else but prints the numbers you were looking for right in your terminal window.

#include <iostream>

#include <sstream>

#include <iomanip>

using namespace std;

class Interest_C

{

private:

float round (float value)

{

return ((int)(value * 100 + .5) / 100.0);

}

public:

float FinalSum(float isum, float percent, float deposit, int period)

{

float SUM = isum;

int i = 0;

do {

SUM = SUM + deposit + ((SUM * percent / 100))/12; because we the interest is for a whole year

cout << i+1 << “. month” << endl;

cout.setf(ios::fixed);

cout << setprecision(0) << round(SUM) << endl;

cout << “Interest = ” << round(((SUM * percent / 100))/12) << endl;

cout << endl;

i++;

}

while (i != period);

return SUM;

}

int FinalPeriod(float isum, float percent, float deposit, float fsum)

{

float SUM = isum;

int i = 0;

do {

SUM = SUM + deposit + ((SUM * percent / 100))/12; //we have to divide by 12 because we the interest is for a whole year

cout << i+1 << “. month” << endl;

cout.setf(ios::fixed);

cout << setprecision(0) << round(SUM) << endl;

cout << “Interest = ” << round(((SUM * percent / 100))/12) << endl;

cout << endl;

i++;

}

while (SUM <= fsum);

return SUM;

}

};

struct myseps : numpunct<char> {

char do_thousands_sep() const { return ‘,’; }

string do_grouping() const { return “\3”; }

};

int main()

{

float initial, p, dep, sum;

int period;

Interest_C *Interest = new Interest_C();

cout.imbue(locale(locale(), new myseps));

char menu = 0;

while (menu != 1)

{

cout << “1 – Find out the sum” <<endl;

cout << “2 – Find out the period” << endl;

cout << “0 – exit” << endl;

char menu;

cout << “1 or 2? “;

cin >> menu;

getchar();

switch (menu)

{

case ‘1’:

cout <<“Initial amount: ” ; cin >> initial;

cout <<“Interest (%): “; cin >> p;

cout <<“Monthly deposit: “; cin >> dep;

cout <<“Period (months): “; cin >> period;

if (period <= 0) period = 1;

Interest->FinalSum(initial, p, dep, period);

break;

case ‘2’:

cout <<“Initial amount: ” ; cin >> initial;

cout <<“Interest (%): “; cin >> p;

cout <<“Monthly deposit: “; cin >> dep;

cout <<“Final sum: “; cin >> sum;

Interest->FinalPeriod(initial, p, dep, sum);

break;

case ‘0’:

return 0;

break;

}

}

delete Interest;

return 0;

}

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