C program to calculate length of the string using recursion

#include <stdio.h>

//function to calculate length of the string using recursion

int stringLength(char *str)

{

    static int length=0;

    if(*str!=NULL)

    {

        length++;

        stringLength(++str);

    }

    else

    {

        return length;

    }

}

int main()

{

    char str[100];

    int length=0;    

    printf("Enter a string: ");

    gets(str);    

    length=stringLength(str);

   printf("Total number of characters (string length) are: %d\n",length);

    return 0;

}