A Program that accepts looping limit and will serve as multiplier of itself(per column) using C-CodePudding

I have a Activity that accepts looping limit and will serve as multiplier of itself(per column) this is the example output

3   9   27
9  27   81
27 81  243

but this is my output

Enter number of rows: 3
3 9 27 
81 243 729 
2187 6561 19683

This is the code

#include <iostream>
using namespace std;
 
int main()
{
    int rows;
    cout << "Enter number of rows: ";
    cin >> rows;
 
    int i, j;
    int num = 1;
    int plc = 1;
    for(i = 1; i <= rows; i  )
    {
        for(j = 1 ; j<=rows ; j  )
        {
            
            plc = plc * rows;
           cout << plc << " ";
        }
        
      
        
        cout << endl;
    }
 
    return 0;
}

Where I did wrong?

CodePudding user response：

You are only multiplying the previous value by rows(3) each time and not taking into account the row and columns, the code below will solve your problem:

int main()
{

    cout << "Enter number of rows: ";
    cin >> rows;

    int i, j;
    int num = 1;
    int plc = 1;
    int count = 0;
    for (i = 1; i <= rows; i  )
    {
        for (j = 1; j <= rows; j  )
        {
            plc = 1;

            for (int mult=0;mult< ((i - 1)   j);mult  )
            {
                plc *= 3;
            }

            cout << plc << " ";
        }

        cout << endl;
    }

    return 0;
}

Gives the expected outout:

3   9   27
9  27   81
27 81  243

CodePudding user response：

Perhaps you forgot to use the num variable?

#include <iostream>

int main( int argc, char* argv[] )
{
    int rows = ::atoi(argv[1]);
    int num = 1;
    for(int i = 1; i <= rows; i  )
    {        
        int plc = num;
        num *= rows;
        for(int j = 1 ; j<=rows ; j  )
        {            
            plc = plc * rows;
            std::cout << plc << " ";
        }
        std::cout << std::endl;
    }
    return 0;
}

Produces:

Program stdout
3 9 27 
9 27 81 
27 81 243

Godbolt: https://godbolt.org/z/sfn119vTs