Return and exit statement

[system]

While solving challenge problems( esp those with score ~ codelength ) in C, i have seen that sometimes they get accepted without including return or exit statement but sometimes it shows run time error. what's the reason for that ?

[system]

Checked it out for minor mistakes like coma , space and syntax and define proper header file and may be you not enter proper value . Hope this small but important point help you to solve out your problem .

such mistakes causes compilation error not run time error.

my solution to kamil --> id = 3136829 in C gives runtime error (NZEC) due to absence of return statement
id = 3136831 in C is AC after including return statement

but my solution to dosdate --> id = 3368957 in C is AC even without a return statement

[ericcarter13]

After exit () all memory and temporary storage areas are all flushed out and control goes out of program. In contrast, the return () statement is used to return from a function and return control to the calling function.
main ()
{
int a;
int b= 5;
a = f1(b);
printf("a=%d",a);
}
f1(a1)
int a1;
{
int a2;
a2 = 5 * a1;
printf("a2=%d",a2);
return(a2);
}

[system]

so why i need return for main() in some c programs while its not necessary for others.

[leppyr64]

If you don't return zero, then your program returns some random information that may or may not be zero.

It's undefined. If you want to trust something that's undefined, go right ahead. Just make sure that you let us all know before you get work in the aerospace field