what is the mistake in this code?

Question

#include <iostream>
using namespace std;

int main()
{
int rows;
cout<<"enter no. of rows required to print pyramid";
cin>>rows;

for(int a=1; a<=rows; a++)
{
for(int b=a; b<rows; b++)
{
cout<<" ";
}
for(int c=1; c<=(2a-1); c++)
{
cout<<"*";
}

cout<<endl;
}
return 0;
}

Answer 1

"2a" doesn't mean 2 multiplied by a. To the compiler, it's simply a bad identifier. Write "2*a" instead.

Answer 2

thanks Hatsy Rei