Converting decimal to binary?

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  1. #1
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    Converting decimal to binary?

    Is there an easy way to convert a decimal number to binary in C? For example, how could I go from:

    decimal 3 to binary 0011?

    Thanks for any advice.

  2. #2
    ATH0 quzah's Avatar
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    Yup. The easiest way is to use the search button. Alternately, if you actually want to learn what you're doing, rather than taking someone's example, you could go here.

    Quzah.
    Hope is the first step on the road to disappointment.

  3. #3
    Just because ygfperson's Avatar
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    0011 =


    0 * 2^3 +
    0 * 2^2 +
    1 * 2^1 +
    1 * 2^0 =
    3

    is bit even? if no, 1. if yes, 0
    divide by 2 (or bit shift)
    is bit even? if no, 1. if yes, 0
    etc... for 7 more times

  4. #4
    Registered User Nutshell's Avatar
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    Code:
    void displayBits( unsigned value )
    { 
       unsigned c, displayMask = 1 << 31;
    
       printf( "%7u = ", value );
    
       for ( c = 1; c <= 32; c++ ) { 
          putchar( value & displayMask ? '1' : '0' );
    
          value <<= 1;
    
          if ( c % 8 == 0 )
             putchar( ' ' );
       }
    
       putchar( '\n' );
    }

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