Class Practice 1
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#include <iostream>
using namespace std;
void draw(int row, int column, char sym){
    int i, j;
    for(i=0;i<row;i++){
        for(j=0;j<column;j++){
            cout << sym;
        }
        cout << endl;
    }
}
int main(){
        int row, column;
        char sym;
        cout << "Number of rows and columns = ";
        cin >> row >> column;
        cout << "Symbol = ";
        cin.ignore();
        cin >> sym;
        draw(row,column,sym);
        return 0;
}


Class Practice 2
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#include <iostream>
using namespace std;
int findLeftDigit(int n){
        return n/10;
}
int findRightDigit(int n){
        return n%10;
}
int main(){
        int n, sum;
        cout << "n=";
        cin >> n;
        sum=findRightDigit(n)*10+findLeftDigit(n);
        printf("sum of digits = %d\n",sum);                               
        return 0;
}


Class Practice 3
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#include <iostream>
using namespace std;
void printRow(int n, char sym){ // print sym n times in a row
        int i, j;
        for(i=0;i<n;i++){
            cout << sym;
        }
        cout << endl;
}
int main(){
        int n, i;
        cout << "n=";
        cin >> n;      
        for(i=1;i<=n;i++)               // print n rows
                printRow(i,'*');        
        return 0;
}