Convert Integer to Binary

[Darryl]

Problem in line #9 - the "," should be a ";" I think.

No, that's right, I think C uses the comma operator too.

It is not good to cram so much code into one line, The compiler can keep it all straight, but it hurts my head to look at it!

Yea, but I hate vertical space, I think I read once, debugging is easier and code is less likely to have errors if you can view it all at once without scrolling.

[ilikepython]

Hey, I found another way:
[code=c]
char buffer[33];
int num = 30;
itoa(num, buffer, 2);
cout << buffer << endl;
[/code]

[ravenspoint]

Hey, I found another way:
[code=c]
char buffer[33];
int num = 30;
itoa(num, buffer, 2);
cout << buffer << endl;
[/code]

Bravissimo!

Today's lesson: RTFM

Parameters

value
Number to be converted

string
String result

radix
Base of value; must be in the range 2 – 36

[Banfa]

Yea, but I hate vertical space, I think I read once, debugging is easier and code is less likely to have errors if you can view it all at once without scrolling.

This is true, however it does not mean cram all the code onto one line otherwise by that argument your code is most maintainable in this form

[code=c]
#include "stdio.h"
int main(){ char bits[33]="0000000000000 000000000000000 0000"; int index=0; unsigned number = 23, copy = number; while(copy>0) bits[31-index++]='0'+ (1 & copy), copy>>=1; printf("%d -> %s\n",number , bits);}
[/code]

What that statement means is that you should keep the individual code units (functions) small enough that the fit on your screen without the need to scroll, not that you should compress your code by using shortcuts and leaving out vertical space. The first will increase maintainability and reduce the chance of putting bugs in in the first place the second will result in less maintainable harder to read code.

A good rule of thumb is "<= 1 statement per line"

In general the comma operator is not a particularly useful one and normally only sees usage in the 1st and 3rd expressions of a for loop.

[joeschnell]

Python, what does itoa mean in your code?

[ilikepython]

Python, what does itoa mean in your code?

The function means to turn an integer into a string. The name just means integer to ascii (string) (i to a).

[umeshpatil]

[HTML]

#include<stdio.h>
#include<math.h>

int main(int argc, char *argv[]){
   int num=atoi(argv[1]),r,bin[10]; // takes number from commandline argument 
  for(i=0;i<10;i++)
          bin[i]=3;   
 i=0; 
 while(num!=0){
       r=num%2;
       bin[i]=r;
       i++: 
      num=num/2; 
         
       }
 printf("\nNumber %d in binary is..\n");
 for(i=9;i>=0;i--)
    if(bin[i]!=3) printf("%d",bin[i]); 
 getch(); 
 return 0;
}

This codes shows converting number from decimal to binary. [/HTML]

[umeshpatil]

#include<stdio.h>
#include<math.h>

int main(int argc, char *argv[]){
   int num=atoi(argv[1]),r,bin[10]; // takes number from commandline argument 
  for(i=0;i<10;i++)
          bin[i]=3;   
 i=0; 
 while(num!=0){
       r=num%2;
       bin[i]=r;
       i++: 
      num=num/2; 
         
       }
 printf("\nNumber %d in binary is..\n");
 for(i=9;i>=0;i--)
    if(bin[i]!=3) printf("%d",bin[i]); 
 getch(); 
 return 0;
}

This codes shows converting number from decimal to binary.

[LXSoft]

Without modulus operator: (works with any range of values)

int ttobit(int num)
{
    int power = log2(num);
    int res[99];
    int sum = 0;
    int counter = 0;

    while(power >= 0)
    {
        sum = sum + pow(2,power);

        if(num>=sum) {res[counter] = 1;}
        else
        {
            sum = sum - pow(2,power);
            res[counter] = 0;
        }
        counter++;
        power--;
    }

    return res[99];
}

With integer representation of bytes: (only works with values under 1024)

int ntobit(int num)
{
    int power = log2(num);
    unsigned long int res = 0;
    
    int sum = 0;

    while(power >= 0)
    {
        sum = sum + pow(2,power);

        if(num>=sum) { res = (res*10) + 1; }
        else
        {
            sum = sum - pow(2,power);
            res = (res*10) + 0;
        }

        power--;
    }

    return res;
}

[bibiki]

int numToConvert;
String rez = "";

while(numToConv ert > 0)
{
rez = (numToConvert%2 ) + rez;
numToConvert = (int)(numToConv ert/2);
}
//turn rez into an int, and there you go

[whodgson]

On a minor point (@emaghero)the C++ pow() function return a double from its two double arguments