lab 4

.gitignore

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+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app

Lab 3/101_task1.cpp

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+#include<iostream>
+using namespace std;
+
+class Counter{
+    private:
+        int count, step;
+    public:
+    Counter():count(0), step(1)
+    {
+
+    }
+    void setIncrementStep(int step_val){
+        step = step_val;
+    }
+    int getCount(){
+        return count;
+    }
+    void increment(){
+        count += step;
+    }
+    void resetCount(){
+        count = 0;
+    }
+};
+
+void mainMenu(){
+    cout<<"What do you want to do?\n1.Set increment step\n2.Get count\n3.Increment\n4.Reset Count\n5.Exit\nOption: ";
+}
+
+int main(){
+    Counter c;
+    int option;
+    bool runProgram = true;
+    while(runProgram){
+        mainMenu();
+        cin >> option;
+        switch (option)
+        {
+        case 1:
+            int i_step;
+            cin >> i_step;
+            c.setIncrementStep(i_step);
+            break;
+        case 2:
+            cout<<"The counter is :"<<c.getCount()<<endl;
+            break;
+        case 3:
+            c.increment();
+            break;
+        case 4:
+            c.resetCount();
+            break;
+        default:
+            runProgram = false;
+            break;
+        }
+    }
+}

Lab 3/101_task2.cpp

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+#include<iostream>
+using namespace std;
+
+class RationalNumber
+{
+    private:
+        int numenator, denominator;
+    public:
+    RationalNumber():numenator(0), denominator(1)
+    {
+
+    }
+    void assign(int nom, int denom){
+        if(denom == 0){
+            cout<<"Error\n";
+            return;
+        } 
+        numenator = nom;
+        denominator = denom;
+    }
+    double convert(){
+        double d = (double)numenator/(double)denominator;
+        return d;
+    }
+    void invert(){
+        if(numenator == 0){
+            cout<<"Error\n";
+            return;
+        }
+        swap(numenator, denominator);
+        cout<<"Inverted\n";
+    }
+    void print(){
+        cout<<"The rational number is: "<<numenator<<"/"<<denominator<<endl;
+    }
+};
+
+void mainMenu(){
+    cout<<"What do you wanna do?\n1.Assign\n2.Convert\n3.Invert\n4.Print\n5.Exit\nOption: ";
+}
+
+int main(){
+    RationalNumber r;
+    bool runProgram = true;
+    int option;
+    while(runProgram){
+        mainMenu();
+        cin >> option;
+        switch (option)
+        {
+        case 1:
+            int nom, denom;
+            cout<<"Nominator: ";
+            cin >> nom;
+            cout<<"Denominator: ";
+            cin >> denom;
+            r.assign(nom, denom);
+            break;
+        case 2:
+            cout<<"Double result: "<<r.convert()<<"\n";
+            break;
+        case 3:
+            r.invert();
+            break;
+        case 4:
+            r.print();
+            break;
+        default:
+        runProgram = false;
+            break;
+        }
+    }
+}

Lab 3/101_task3.cpp

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+#include <iostream>
+#include <cstring>
+using namespace std;
+
+class Product
+{
+private:
+    char Pname[50];
+    double discount, unitPrice;
+
+public:
+    Product() : Pname("x"), discount(0.5), unitPrice(10.0)
+    {
+    }
+
+    void assignName(char name[])
+    {
+        strcpy(Pname, name);
+    }
+    void setPrice(double price)
+    {
+        unitPrice = price;
+    }
+    void setDiscPercent(double percent)
+    {
+        if(percent < 0 || percent > 10) {
+            cout<<"Error\n";
+            return;
+        }
+        discount = percent;
+    }
+    double getSellingPrice(int nos)
+    {
+        double priceRatio = (100 - discount) / 100;
+        double total = nos * unitPrice * priceRatio;
+        return total;
+    }
+    void display()
+    {
+        cout << Pname << " has a unit price of BDT " << unitPrice << ". Current discount " << discount << "%.\n";
+    }
+};
+
+void mainMenu(){
+    cout<<"What do you want to do?\n1.Assign name\n2.Set Price\n3.set Discount\n4.Get selling price\n5.Display\n6.Exit\nOption: ";
+}
+
+int main(){
+    Product p;
+    bool runProgram = true;
+    int option;
+    while (runProgram)
+    {
+        mainMenu();
+        cin >> option;
+        switch (option)
+        {
+        case 1:
+            cout<<"Give name: ";
+            char name[50];
+            getchar();
+            gets(name);
+            p.assignName(name);
+            break;
+        case 2:
+            double price;
+            cout<<"Price: ";
+            cin >> price;
+            p.setPrice(price);
+            break;
+        case 3:
+            cout<<"Discount: ";
+            double discount;
+            cin >> discount;
+            p.setDiscPercent(discount);
+            break;
+        case 4:
+            cout<<"No. of items: ";
+            int items;
+            cin >> items;
+            cout<<"Selling price: ";
+            cout<<p.getSellingPrice(items)<<"\n";
+            break;
+        case 5:
+            p.display();
+            break;
+        default:
+            runProgram = false;
+            break;
+        }
+    }
+
+}

Lab 4/101_task1.cpp

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+#include <iostream>
+using namespace std;
+class Calculator
+{
+private:
+    int value;
+
+public:
+    Calculator() : value(0)
+    {
+    }
+    Calculator(int x) : value(x)
+    {
+    }
+    int getValue()
+    {
+        return value;
+    }
+    void setValue(int _value)
+    {
+        value = _value;
+    }
+    void add(int _value)
+    {
+        value += _value;
+    }
+    void substract(int _value)
+    {
+        value -= _value;
+    }
+    void multiply(int _value)
+    {
+        value *= _value;
+    }
+    void divideBy(int _value)
+    {
+        if (_value)
+            value /= _value;
+        else
+            cout << "Error : divide by 0 is undefined." << endl;
+    }
+    void clear()
+    {
+        value = 0;
+    }
+    void display()
+    {
+        cout << "Calculator Display:" << value << endl;
+    }
+    ~Calculator()
+    {
+        cout << "Calculator object is destroyed." << endl;
+    }
+};
+
+int main()
+{
+    Calculator calc;
+    calc.add(10);
+    calc.display();
+    calc.add(7);
+    calc.display();
+    calc.multiply(31);
+    calc.display();
+    calc.substract(42);
+    calc.display();
+    calc.divideBy(7);
+    calc.display();
+    calc.divideBy(0);
+    calc.display();
+    calc.add(3);
+    calc.display();
+    calc.substract(1);
+    calc.display();
+    calc.clear();
+    calc.display();
+    return 0;
+}