Value to binary number.

This is a discussion on Value to binary number. within the General Discussions forums, part of the Community Boards category; When calculating the value of a binary number for example 10010111 I need to do the following. (1*2^7) + (0*2^6) ...

  1. #1
    Learning C. JOZZY& Wakko's Avatar
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    Value to binary number.

    When calculating the value of a binary number for example 10010111 I need to do the following.
    (1*2^7) + (0*2^6) + (0*2^5) + (1*2^4) + (0*2^3) + (1*2^2) + (1*2^1) + (1*2^0) = 128 + 0 + 0 + 16 + 0 + 4 + 2 + 1 = 151
    But what if I am given the number 456 and I need to convert this value into a binary number. How would I do this this?

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    spurious conceit MK27's Avatar
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    Quote Originally Posted by JOZZY& Wakko View Post
    But what if I am given the number 456 and I need to convert this value into a binary number.
    It's already stored that way. Ironically, there is no standard method for presenting a binary number in human readable output in C -- the way that %d and %x work for decimal and hexadecimal.

    So you have to turn int x=456 into a string, "111001000". I'll give you a clue:
    Code:
    	int x=456, i;
    	for (i=512; i>0; i/=2) {
    the next step involves testing with AND (x&i).
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

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