Why am getting this error??

Question

#include<iostream>
#include<math.h>
#include<string>
using namespace std;
long lineFor(int x){
return (pow(11,x));
}
int main(){
int rows;
string line;
cout<<"Enter the number of rows: ";
cin>>rows;
for(int y=0;y<=rows;y++){
line=(string)lineFor(y);//Here comes the error
for(int s=line.length();s>=0;s--){
cout<<" ";
}
cout<<line<<endl;
}
}

Answer 1

it says invalid conversion

Answer 2

You can't directly convert an integer, long etc,. to a string in C++. Use the below code instead. And don't forget to add #include<sstream>.

long a = lineFor(y);
ostringstream ss;
ss<<a;
line = ss.str();