C to C++ translation help?

i found this program and i'm more familiar with c++ but this is in c and i just can't figure out how to put it into c++

Code:

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/* Demonstration of the do…..while loop */

    #include <stdio.h>

    int main(void)
    {

        int value, r_digit;

        printf(“Enter a number to be reversed.\n”);
        scanf(“%d”, &value);

        do
            {
                r_digit = value % 10;
                printf(“%d”, r_digit);
                value = value / 10;
            } while (value != 0);

        printf(“\n”);

        return 0;


    }

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Use cout instead of printf(), cin instead of scanf(), and include iostream instead of stdio.h. Lastly, to be completely portable, I believe main() should accept nothing, not even void. For C, void is preferred.

So yeah... That's easy.

Quote:

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Originally Posted by MacGyver

Lastly, to be completely portable, I believe main() should accept nothing, not even void.

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Your belief is incorrect. In C++ "int main()" is equivalent to "int main(void)".

There is also the minor point that no return statement is required from main() in C++: falling off the end is equivalent to returning zero. That is also true in the 1999 C standard but not, IIRC, in the 1989 C standard.

Although using void for a function argument is allowed in C++, I believe it's generally considered bad style, since the only reason for it is to avoid the ambiguity caused by C's backwards compatibility with the old K&R function declarations, and those aren't allowed in C++. So to make the code fully C++-like, the void should probably be taken out.

Last I checked, "bad style C++" (something some mere mortals will frown upon) is a subjective notion that differs from "invalid C++" (something that, arguably, can be defined objectively by reference to the C++ standard).

I have seen some C++ style guides (admittedly ones I don't subscribe to) that require functions with no arguments to be declared with a void argument list. One of the reasons, stated in one of those style guides, is that a fair amount of C++ code interfaces to legacy C code.

If you want to ignore style (a hugely important part of programming), than why not just leave it with printf and scanf? I mean, <cstdio> has them, so, it's perfectly valid C++. Of course, if you actually want to program in C++, taking out the "void" would be a good idea, along with switching to cin, cout, etc.