strange declaration error

Well, it's strange, in C++ you can declare that type of variables almost any where in the code...

I have one question:
If we have a block inside the function can we declare a variable inside that block...

int main()
{
{
int x;
}
return 0;
}

Is that OK!

hi
something very strange is happening, or im simply blind.

Code:

---

#include<stdio.h>

int main ()
{
        printf("whats wrong?");
        int i;       
        return 0;
}

---

my compiler doesnt compile it but says that the "Declaration is not allowed here in function main"

im using Borland C++ 5.5.1 for win32

whats wrong with this small code? why cant i declare variables in
main?
whaaa

In C, declarations have to be at the top of functions.

I think C99 allows declarations anywhere -- as long as you declare before you use, but I'm not sure; I don't usually program in C. If that's the case, then if you get an updated C compiler you might be able to what you were trying to do.

after you started the program.
You can declare a variable outside a function (global variable) or at the start of the function, look:

Code:

---

#include <stdio.h>

/* global var */
int iGlobal;

int main(void)
{
    /* local var */
    int iLocal;
 
    return 0;
   
}

---

darn!
thanks i was going blind because of python.

I dont think this was mentioned, if so I didnt read everything right. If you have a function, all the variables must be declared at the top of that function

Code:

---

void print()
{
    int i;
    printf("something");
}

---

>>all the variables must be declared at the top of that function
No, as said by Salem, local variables must be declared at the top of the code block, not the function.

So, a very simplistic example would be this:

Code:

---

#include <stdio.h>

int main()
{
    int i;
   
    for (i = 0; i < 10; i++)
    {
        int j;
        j = i * 10;
        printf ("%d * 10 is %d\n", i, j);
    }

    return 0;
}

---

Here, j is declared within the for loop, and therefore it's scope is limited to that code block.

Is this good programming style? Well, that's another conversation that I'm sure someone will argue to death in a 50 post long thread, but imho, if it suits your needs, use it.

Quote:

---

#include<stdio.h>

int main ()
{
printf("whats wrong?");
int i;
return 0;
}

---

This compiles fine with me, using GCC 3.1. According to C99, the latest C standard, this is valid C. C99, like C++, does not require that all declarations appear at the start of a block.