String Length - STRLEN

/* STRING LENGTH - STRLEN*/

#include<stdio.h>

int main()
{
 char str[100];
 int i;
 printf("Please enter a string: ");

 // gets(str);
 // fgets is a better option over gets to read multiword string .

 fgets(str, 100, stdin);

 // Following can be added for extra precaution for '\n' character
// if(str[length(str)-1] == '\n') 

str[strlen(str)-1]=NULL;

 for(i=0;str[i]!=NULL;i++);

 printf("Length of string is: %d",i);

 return 0;
}