Question on structure in C programming

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C++

#include <stdio.h>
#include <stdlib.h>
struct test
{
    int id;
    char name[20];
};
int main()
{

struct test t1;

   t1.id=1;
   fflush(stdin);
   fgets(t1.name,20,stdin);

print(&t1.name);
print1(t1.id,&(t1.name));

}
void print(struct test *name)
{
    puts(name);
}

void print1(struct test id,struct test *name)
{

    printf("\n%d\n",id);
    puts(name);
}

What I have tried:

the first puts in print function works perfectly but why doesnt it works in second function in print1?

Posted 10-Jul-16 0:26am

wedtorque

Updated 10-Jul-16 5:19am

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Comments

Kornfeld Eliyahu Peter 10-Jul-16 6:32am

Did you checked it with the debugger?

2 solutions

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OriginalGriff · Answer 1 · 2016-07-10T00:38:00

Solution 1

Simple: it's not a struct test that you pass to the method, it's a string.
Your functionm expects a pointer to a struct:

C++

void print1(struct test id,struct test *name)
{
    printf("\n%d\n",id);
    puts(name);
}

but you pass this:

C++

print1(t1.id,&(t1.name));

Which is a char *:

C#

struct test
{
    int id;
    char name[20];
};

And you pass an integer as the first value as well!
I'm not sure what you are trying to do here - I think you want to re-read your course notes and try again!

Posted 10-Jul-16 0:38am

OriginalGriff

Comments

wedtorque 10-Jul-16 6:44am

why does the first function is working ?
regarding what i want to do
let consider a structure with 5 member .i want to send the first member as a value and 2nd member by refernce to a function .how would i do that ?

OriginalGriff 10-Jul-16 6:53am

void MyFunction(int id, char** pstrName)
{
...
}
...
MyFunction(t1.id, &(t1.name));

Or just pass a pointer to the whole struct:
void MyFunction(struct test* data)
{
...
}
...
MyFunction(&t1);

wedtorque 10-Jul-16 6:58am

thanks :) this solves my question

Patrice T · Answer 2 · 2016-07-10T05:19:00

as OriginalGriff already said, the parameters *name are not structures, they are *char.

You should go back to C/C++ basics:
The C Programming Language - Wikipedia, the free encyclopedia[^]
https://hassanolity.files.wordpress.com/2013/11/the_c_programming_language_2.pdf[^]
http://www.ime.usp.br/~pf/Kernighan-Ritchie/C-Programming-Ebook.pdf[^]

Use the debugger to see what your code is doing.
The debugger allow you to follow the execution line by line, inspect variables and you will see that there is a point where it stop doing what you expect.
Debugger - Wikipedia, the free encyclopedia[^]
Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]

Question on structure in C programming

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