String Reverse - STRREV

/* STRING REVERSE - STRREV */

#include<stdio.h>

int main()
{
 char str[100];
 int i,j;
 char c;
 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];i++);
 for(j=0,i--;j<i;j++,i--)
 {
  c=str[i];
  str[i]=str[j];
  str[j]=c;
 }

 printf("Reversed string is: %s",str);

 return 0;
}