passing parameter

likeit · #1 26-Jul-2005, 22:07

i have a prog by input a number then after press ENTER the output is value of the number.if the number 0 then exit the prog
output:

input a number: 4
value:4

CPP / C++ / C Code:

#include<stdio.h>
#include<conio.h>

int view(int );
void printview(int a);
main(){
int no,view;
do{
printf("input a number:");
scanf("%d",&no);
view=view(no);
printview(view);
}while(no!=0);
getch();
return 0;
}

int view(int a)
{
a=no;
return a;
}

void printview(int a)
{
printf("value:%d",a);
}

but as i get the result,the passing doesn't work.

what cause the passing parameter can't run?

nkhambal · #2 26-Jul-2005, 23:34

were you able to complie it ? I see one mistake in function view()

CPP / C++ / C Code:

int view(int a)
{
a=no;
return a;
}

where does this variable "no" come from.? Its not declared inside view() and the one in main() is local to main() and not global. Hence you can not access it inside. You are trying to assign a non-existent variables value to variable a.

My guess is ( sorry, if its not as good as yours ;-) ), this is what you intended to write,

CPP / C++ / C Code:

int view(int a)
{
int no=a;
return no;
}

Thanks,

alcedo · #3 27-Jul-2005, 05:53

CPP / C++ / C Code:

int view(int a)
{
   return a;
}

I suppose that would work too

alcedo · #4 27-Jul-2005, 05:57

Ar actually, i think you are confused over functions parameter passing

CPP / C++ / C Code:

int view(int no)    //U can declare your function like this as well.
{
   return no;
}

void printview(int no)
{
   printf("value:%d",no);
}

in short, U dont have to match parameter names exactly. U dont have to return a value labelled as 'a' to a function that has 'a' as its parameter declaration.

davekw7x · #5 27-Jul-2005, 08:33

Quote:

Originally Posted by likeit

i have a prog by input a number

but as i get the result,the passing doesn't work.

There are several bugs in the code that you posted that prevent the code from compiling on anything that I can imagine. They are fatal, guaranteed-not-to-compile-with-any-compiler bugs.

1. If the code that you posted is not exactly the code that you compiled, then no one can help you understand your problem. Paste your code into the message; don't retype.

2. If the code that you posted is exactly the code that you compiled, please tell us what compiler you used. (We still may be able to help you, but I would like to know this.) When you say "the passing didn't work" you should tell us exactly what you got, and why you think it should have been something else.

3. If your code didn't compile, then look at the compiler's error messages. Fix the code so that it compiles. If you can't figure out what the error messages mean, then post the error messages exactly as the compiler gave them to you (paste the exact error message; don't summarize). Maybe we can point out how to interpret the compiler's error messages, so that you can understand what it's trying to tell you.

Regards,

Dave

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