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I have been trying this problem SUCCESS at spoj but I am not able to get optimal solution to that problem

I tried

int main(){return !puts("Success");}

but it takes 45 characters. Any alternate suggestions to solve the problem? People have solved it using 24 characters also.

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main(){puts("Success");}

24 characters.

• in C, if you omit the return type, it is implicitly int
• if main() does not contain a return statement, then the return value of main is 0

UPDATE: All right, the return from main can be omitted in every version of C, but only C99 defines the return value to be 0 if omitted. C99 also disallows implicit declarations.

UPDATE: I have faint memory that somebody pulled this off for a similar problem: He/She somehow encoded most of the program in the file name so that the __FILE__ macro could be used in the program code to inject the code. I don't know if this is within the rules for OP's competition, but it should make an interesting exercise anyway.

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The problem statement is very vague, it look like it needs to compile with gcc -ansi and return 0 when run. Best I could come up was this:

main(){exit(!puts("Success"));}

32 characters counting the final newline (can you omit that?). Adding int to main() puts it at 36 characters.

Edit

This probably won't be allowed:

/* Filename: Success */
main(){exit(!puts(__FILE__));}

Compile with gcc -x c -ansi Success and it will save you another character!

And what about this one character solution:

C

Just compile with gcc -ansi -DC='int main(void){puts("Success");return 0;}'.

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26 characters

main(){brk(printf("%m"));}

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26

main(){j0(!printf("%m"));}

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int main(){perror(0);}

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30 characters:

main(){exit(!printf("%m\n"));}

29 characters:

main(){exit(!printf("%m
"));}

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Here's a simple one in 24 chars...

main(){puts("Success");}

Neither the int return type for main() nor the return statement are strictly necessary...

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Making it smaller relies on doing things which are not portable or strictly valid C. On a POSIX environment with lax enforcement of the rules, you can do (18 characters):

main(){perror(0);}

But unless int and pointers have the same size, this will break. Adding 1 extra character and taking advantage of the fact that real-world POSIX systems have long and pointer types the same size:

main(){perror(0L);}

I don't think you can make it any smaller.

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I made it in 0 (zero) characters:

 cat src.c

 (empty)

the resulting executable:

rbo@deneb ~
$ ./src
SUCCESS

and the command line:

rbo@deneb ~
$ echo x>>src.c && gcc -Dx="int main(){return puts(\"SUCCESS\");}" -o src src.c

But this of course still creates a source file with on character, as Pedro has pointed out below. Without any source file, the command would be (in a Unix environment):

rbo@deneb ~
echo 'int main(){return puts("SUCCESS");}'|gcc -ansi -o src -xc -

which is even shorter than the above. In the original description, there's no restriction stated how to solve it, but the OP adds in a later comment he can't change the command line. If this is true, then this is not really a Code Golf ;-)

Regards

rbo