Finding String Length Without Library Function

 #include<bits/stdc++.h

using namespace std;

int Length(string a)

{

int cnt=0,i=0;

while(a[i++]!='\0')

{

cnt++;

}

return cnt;

}

int main()

{

string a;

cin>>a;

cout<<Length(a)<<endl;

return 0;

}