int strlength(char s[])
{
  int i,len;
  for(i=0;s[i];i++)
      len++;
   return len;
}

** same as above.. only u should initialise the valued of 
varibale len to 0..
otherwise it will pick up some garbage value.. **


int strlength(char s[])
{
  int i , len;
  
  len = 0;
  for(i = 0 ; s[i] != '/0' ; i++)
  {
    len++;
  }

return len;
}

#include<stdio.h>
int strlength(char *);
int main()
{
  char *str;
  int len;
  printf("Enter a string : ");
  gets(str);
  len=strlength(str);
  printf("Length of %s is %d",str,len);
  return 0;
}
int strlength(char *str)
{
  int len=0;
  for(;*str!='\0';str++)
  {
    len++;
  }
  return len;
}