Program in C++ to find the length of string using user define function

Program in C++ to find the length of string using user define function 

#include<iostream>
#include<string.h>
#include<conio.h>
 using namespace std;
    int StrLen(char *str)
  {
   int i;
   for(i=0;str[i]!='\0';i++);
     return i;
  } 

  int main()
  {
   char str1[100];
   cout<<"Enter string :-";
   cin.getline(str1,99);
   cout<<"Length of string ="<<StrLen(str1);
   getch();
  }

Output:-

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