Error: ‘pow’ was not declared in this scope

by

std::pow is defined in cmath, so you need to include cmath:

#include <iostream>
#include <cmath>   // <-- include cmath here

using namespace std;

int main()
{
    int x;

    cout << "How many rows would you like? " << endl;
    cin >> x;
    cout << endl;
    cout << "Number| Power 1| Power 2| Power 3| Power 4| Power 5" << endl;

    for (int j=0; j<=x; j++)
    {
        cout << j << "\t" << j << "\t" << pow(j,2) << "\t" << pow(j,3) << 
"\t" << pow(j,4) << "\t" << pow(j,5) << endl;

    }

    return 0;
}

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