If else if else if else

**CAP** · 08-01-2002

Ok, I don't know why but it seems that almost everytime I try and make a program using if and/or else and execute it that it gives me an "error, must shut down" but I don't know why, this one is from the book(I just put in the #include and int main() and the scanf thing, here is the code if it will help:

Code:

#include <stdio.h>

int age=0;

int main()
{
	printf("To find out if you are a minor, adult, or senior citizen please enter your age: ");
	scanf("%d", age);

	if( age < 18 )
    printf("Minor");

	else 
	
	if( age < 65 )
    printf("Adult");

	else
    printf( "Senior Citizen");
}

thanks in advance

**no-one** · 08-01-2002

change

scanf("%d", age);

to

scanf("&d", &age);

you are undeclaredly using pointers with scanf, you need to pass the adress of variables.

**Cshot** · 08-01-2002

your scanf should look like this:
scanf("%d", &age);

**moi** · 08-01-2002

do you people even try to compile these things?

Code:

C:\WINDOWS\Desktop>gcc -c dum.c -o dum.o -Wall
dum.c: In function `main':
dum.c:8: warning: format argument is not a pointer (arg 2)
dum.c:20: warning: control reaches end of non-void function

fix both of those errors

**gabulldog** · 08-01-2002

do you people even try to compile these things?

Compiles fine on Microsoft's Visual C++ compiler

Doesn't run though

**moi** · 08-01-2002

Originally posted by gabulldog

Compiles fine on Microsoft's Visual C++ compiler

Doesn't run though

well then i guess gcc > msvc++

**gabulldog** · 08-01-2002

Smart developers > any compiler

**Hammer** · 08-01-2002

>do you people even try to compile these things?
Some compilers don't warn about the 2nd arg on scanf() calls not being pointers, so the newbie wouldn't necessarily know that they'd done wrong.

[edit]beaten.... doh! Anyways, Borland 5.5 doesn't warn either.

**CAP** · 08-01-2002

Compiles fine on Microsoft's Visual C++ compiler
But doesn't run

That is what I am using

I got it to work, It works with the thing being
scanf("&d", &age);
and with
scanf("%d", &age);

Which one of these is "preferable" or right by a standard, or are they both equal?

**Cshot** · 08-01-2002

I got it to work, It works with the thing being
scanf("&d", &age);
and with
scanf("%d", &age)

Ummm, the 2nd one is missing a semicolon. Missing semicolons = BAD

**moi** · 08-01-2002

Originally posted by CAP

That is what I am using

I got it to work, It works with the thing being
scanf("&d", &age);
and with
scanf("%d", &age)

Which one of these is "preferable" or right by a standard, or are they both equal?

no semicolon = wtf

**ygfperson** · 08-01-2002

variable length functions are very difficult to type check. the type of variable can only be determined at run time (i think). scanf, being a generic function, is a special case, so it may be treated specially by gcc.

i have a somewhat related question...
functions like

Code:

void func1 (int &x ) {

...
}

work in c++, but do they work in c? if they don't that would explain why scanf inputs data that way.

**no-one** · 08-01-2002

sorry for the typo,

use scanf("%d", &age);

**CAP** · 08-01-2002

Ya sorry for mine too, it was an accident, but all fixed now, I had it right in the program.

I am working on learning the language, like the syntax and all but can someone please reccomend a book, website, or something that is a good guide to something like "All things C" because even if you know the language there are so many ways to do things and how to do them better, is there a resource out there on the best techniques and such??

**ronin** · 08-01-2002

I should really take a class in C, but I hate doing the programs in school since they suck... I had to write five programs in my CPP class, yet neither program taught me anything new. I would suggest looking into lots of souce code. You might not understand everything... lord knows that I don't

... but it's a great way to see what the professional programmers are doing.

Check out http://www.wrox.com for links to source code, or even sign up for some on-line programming classes at http://www.codewarrioru.com the classes were free the last time I checked into it.

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