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Hi.
I need help. I would like to have a function that returns to it's parent function if conditions are not met, however my code will not compile. I am using Xcode 3. Here is the non functioning code:
Thanks to anyone who can help.Code:#include <stdio.h>
void first(void);
int main()
{
first();
printf("first completed successfully");
}
void first(void){
int welcome;
scanf( "%d", &welcome );
fpurge( stdin );
if(welcome == ""){
return();
}
else{
first();
}
}
Please, read a basic book on C or something. It would be much better than posting this here.
Go easy, it's his/her first post and the code is at least a decent attempt.Quote:
Please, read a basic book on C or something. It would be much better than posting this here.
Generally speaking, when your code fails to compile you receive compiler warnings. You may not be able to understand them at this point in time, but if you post them along with your code it will greatly help the people that are trying to help you.
Not sure why your 'welcome' variable is preceded by two tabs? I'm pretty sure this doesn't actually matter but it just seems weird.
'welcome' is an integer, while comparing it to the empty string may work, it's counter-intuitive to do so. I'd imagine you want to compare it to 0.
When you don't want to return a value, you can just use 'return;'. The parenthesis shouldn't be there.
Calling 'first' recursively isn't the best here because the user may never enter zero and you'd run out of stack space. This is best implemented as a simple loop, but it should at least work for now.
A couple of things more:
1. In the code you say that your main returns an int, but you are not returning anything from it. So make sure you return an int from the main.
2. The fpurge() function is non-standard, and is not recommended even on systems where it's provided.
>In the code you say that your main returns an int, but you are not returning anything from it. So make sure you return an int from the main.
Here's a quote from the standard. Writing return 0; explicitly is not really necessary. However, unlike in C++, I'd recommend to explicitly state in C functions that there are no agruments by putting void between parentheses. Because if one declares a prototype with empty parentheses, any argument list could be written in function definition, causing no errors, much for compatibility with legacy code.Quote:
5.1.2.2.3 Program termination
1 If the return type of the main function is a type compatible with int, a return from the
initial call to the main function is equivalent to calling the exit function with the value
returned by the main function as its argument;10) reaching the } that terminates the
main function returns a value of 0.