Class Practice p.2
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#include <iostream>

using namespace std;

int main()
{
    int x, y;
    
    cout << "Input x = ";
    cin >> x;
    
    cout << "Input y = ";
    cin >> y;
    
    if(x%3==0&&y%3==0)
        cout << "Yes" << endl;
    else
        cout << "No" << endl;

    return 0;
}

Class Practice 1
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#include <iostream>

using namespace std;

int main()
{

        float base, height, area;

        cout << "input base of a triangle: ";
        cin >> base;

        cout << "input height of a triangle: ";
        cin >> height;

        area = base * height * 0.5;

        cout << "area="<< area << endl;

        return 0;
}
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Class Practice 2
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#include <iostream>

using namespace std;

int main(){

        float num1, num2, num3;

        cout << "input three integers: ";
        cin >> num1 >> num2 >> num3;

        cout << "average=" << (num1+num2+num3)/3;

        return 0;
}
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Class Practice 3
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#include <iostream>

using namespace std;

int main(){

        int num;

        cout << "input an integers: ";
        cin >> num;

        cout << "Unit digit=" << num%10 << endl;

        return 0;
}
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Class Practice 4
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#include <iostream>

using namespace std;

int main(){

        char c;

        cout << "input a character: ";
        cin >> c;

        cout << "Next character=" << c+1 << endl;

        return 0;
}

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Class Practice 5
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#include <iostream>

using namespace std;

int main(){

        char c;

        cout << "input a lowercase letter: ";
        cin >> c;

        cout << "Uppercase letter=" << (char)(c-('a'-'A')) << endl;

        return 0;
}
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