How to find the length of a string without using library function strlen

/*How to find length of a string without using library function strstr.
How to use pointer/array to find length of string sentence. C++/CPP/C program/code to find length a string/word/sentence without using inbuilt function strlen.How to find the length of a string without using library function strlen*/

#include<stdio.h>

#include<string.h>

int strLen(char *p);

int main()

{

char arr1[20];

printf("Enter a String:\n");

scanf("%s",&arr1);

printf("You entered:%s\n",arr1);

int n;

n=strLen(arr1);

printf("Strlen of entered string is:%d\n",n);

return 0;

}

int length=0;

int strLen(char *p)

{

printf("Inside strLen\n");

char *temp;

temp=p;

while(*temp)

{

temp++;

}

return (temp-p);

}

/*

Enter a String:

India

You entered:India

Inside strLen

Strlen of entered string is:5

* */

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