Question

write a program for the following way
1
12
123
1234
12345

Answer 1

#include <iostream>
using namespace std;

int main(void)
{
int i, j, n;
cout <<"Enter number: ";
cin >> n;

for(i = 1; i<= n; i++)
{
cout<< endl;

for(j = 1;j <= i; j++)
cout<< j;
}

return 0;
}