Problem in the code part related to stoi fuction

#1

is it right to convert a int to a string and then convert fist character to int and then compare?
eg . i want to compare the first letter in in 2 int eg 90 and 234
and creat a function which has higher value of first dight so i tried this :
bool compare(int a, int b)
{int i=0;
string q=to_string(a);
string w=to_string(b);
while(q[i]!=NULL && w[i]!=NULL)
{int e=stoi(&q[i]);
int r=stoi(&w[i]);
if(e>r)
{return true;}
i++;
}
return false;
}
this is my compare part please tell what is wrong with this is giving error

#2

@Eshika to_string(90) gives “90” and to_string(234) gives “234”
You can now simply compare a[0] and b[0].

If you want to compare the whole string lexicographically, you can compare it like a < b, directly.

I can help you more if you can elaborate on what exactly is the purpose of this function.

#3

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