Whats wrong in my program . it says one test case failed which is hidden

Question

It says one test case failed I am unable to figure out here is the code.
#include <stdio.h>
int main() {
char str1[30],str2[30];
int first,last,i=0;
gets(str1);
while (str1[i]!='\0')
i++;
last=i-1;
for(first=0;first<i;first++){
str2 [first]= str1 [last];
last--;
}
str2 [first ]='\0';
printf ("%s\n",str2 );
return 0;
}

Answer 1

BTW, you can use strlen() to get the length of a C string.
Also, you can solve this without the use of a second array. Try looping through the char[] backwards outputting the chars.
https://www.programiz.com/c-programming/library-function/string.h/strlen

Answer 2

strrev depends on which compiler you're using and is non standard. Here are a couple of common implementations.
https://www.sololearn.com/Discuss/1350351/?ref=app

Answer 3

You'll need to show your code. We can't view your attempts, so, you'll need to copy your code to the playground, save it, then post a link to it.

Answer 4

Increase your char[] length to 35.

Answer 5

Yes its solved TQ ChaoticDawg i should have cared about string length

Answer 6

ChaoticDawg oh that was the reason . TQ for clearing my doubts

Answer 7

i don't find any mistake in your code. Please try to use NULL instead of \0 in this case.

Answer 8

Your code is correct i tried in compiler i have not found any mistakes . Try other plateform

Answer 9

ChaoticDawg I tried using strrev it was giving error so I thought strlen would not work. May be restricted in code couch problem.
That's why I didn't use.