menusystem.cpp

#include<iostream>
#include<cstdlib> //system

using namespace std;

float calculateArea(float l, float w);
float calculateGoldPrice(
    int currentGoldPrice,
    float kyat,
    float pae,
    float yway
);
void area();
void gold();
void prompt();

int main()
{


    int ans = -1;
    do {
        prompt();
        cin >> ans;

        switch (ans)
        {
        case 1:
            area();
            break;
        case 2:
            gold();
            break;
        case 3: exit(0); break;
        default: cout << "invalid input, only 1,2,3: try again!" << endl;
        }
        system("pause");
    } while (ans!=3);

    return 0;
}


float calculateArea(float l, float w) //float l = l;
{
    return l * w;
}

float calculateGoldPrice(
    int currentGoldPrice,
    float kyat,
    float pae,
    float yway
)
{
    float totalGoldWeight = kyat + (pae / 16) + (yway / 128);
    return totalGoldWeight * currentGoldPrice;

}


void area()
{
    float l = 0.0F;
    float w = 0.0F;
    cout << "enter w: ";
    cin >> w;
    cout << "enter l: ";
    cin >> l;
    cout << "area = " << calculateArea(w, l) << endl;
}

void gold()
{
    int gp = 0;
    float k = 0.0F;
    float p = 0.0F;
    float y = 0.0F;
    cout << "enter current gold price: ";
    cin >> gp;
    cout << "enter kyat: ";
    cin >> k;
    cout << "enter pae: ";
    cin >> p;
    cout << "enter yway: ";
    cin >> y;
    cout << "total gold price  = " << calculateGoldPrice(gp, k, p, y) << endl;
}

void prompt()
{
    system("cls");
    cout << "1-area" << endl;
    cout << "2-gold price" << endl;
    cout << "3-exit" << endl;
    cout << "choose 1,2,3: ";
}