C++ Length of a string

Question

How do you find the length of a string in c++ without using library functions?

Answer 1

by using pointers we can do that like this example :-
unsigned int StringLength( const char s[] ) { unsigned int counter = 0;
while ( *s++ )
counter++;
return counter; }
by using pointer to the string and increment the value of string pointer *s++ and counter we can find the length of string

ex:-
int length(const char* str){
int i = 0;
for(; *str++; i++)
{return i; }

Answer 2

@Martin but @Ms_Shugg wants without without library functions that's why I take character array unless i also post like you explain

Answer 3

@Martin my mistake just miss that thing look at this
#include<iostream>
using namespace std;
int main()
{
    char a[30];
    int i;
    cout<<"Enter a string:";
    gets(a);
    for(i=0;a[i]!='\0';++i);
  cout<<"\nLength of the string '"<<a<<"' is "<<i;
    return 0;}
well we can do like this too

Answer 4

You get a random string and count the number of characters it has.Like

input: "hello"
output:5

Using a for,while or do...while instead of str.length() or str.size()