Can I have some help anyone?

[delonalan]

I have this program and I can't figure it out. Help please!

[Athar]

I can't figure it out.

And what is "it"?

[delonalan]

T

[coder777]

Lol, now that is a question

#define MAXBITS 10
#include <iostream> // Note
using namespace std; // Note


void Flip(char *x, int Last, int step)
{
char swap[2] = {'1','0'}; // Note

int k;
for(k=0;k<=Last;k+=step)
{

x[k] = swap[x[k]-'0'];
}
}

int main()
{
char bits[MAXBITS];
// char swap[2] = {'1','0'}; Note
int k;
for(k=0;k<MAXBITS-1;k++)
{
bits[k]='0'+rand()%2;
}
bits[k]='\0';

Flip(&bits[0],9,1); //I suspect my function call is bad

cout<<endl;
cout <<"Enter a character to quit ";
char quit;
cin >> quit;
return 0;
}

[Mathhead200]

Around line 10, in your flip function you refer to a variable swap:
swap[x[k]-'0'];
I does not appear to be defined in that scope.

Flip(&bits[0],9,1); //I suspect my function call is bad
Here you are passing the address of an array of chars, that is, you are passing a char**. Drop the &.

[delonalan]

Sorry...just a beginner in programming!

[kbw]

You need to make swap global. So move the declaration from main to the top of the program above Flip(). Also, as it never changes, you make it constant:

const char swap[2] = { '1', '2' };

[delonalan]

Thank you all for helping!
I dropped & but it still not working.
Everything in the code is working except the function call Flip which I had to write but I can"t pass the argument in the function without interfeering with swap.

[delonalan]

I did but still no working...I get the error
`swap' undeclared (first use this function)

The program is supposed to work without any changes...I have to only write the function Flip
I tried passing many and sorts of arguments into function but is not working

[LB]

If it needs to work without changes then why are you asking for help with changing it?

[delonalan]

using namespace std;

[kbw]

I did but still no working...I get the error
`swap' undeclared (first use this function)

Have you considered my advice above?

The program is supposed to work without any changes... I have to only write the function Flip

In which case, ignore my advice above. A swap is something we do all the time:
http://en.wikipedia.org/wiki/Swap_%28computer_science%29

[delonalan]

I just needed to write the function Flip but my codding is not working

[LB]

All you have to do is replace
//x[k] = swap[x[k]-'0'];//I commented this out to get an output
with
x[k] = '1' - (x[k] - '0');
and replace
Flip(&bits[0],9,1); //this is the problem
with
Flip(bits, 9, 1);

[delonalan]

Still no working...does it work for you when you compiled? I can't pass the compiler step

[LB]

What exactly is the error the compiler is giving you (copy and paste), and on what line of code (also copy and paste)?