Convert two 32-bit longs to one 64-bit long long

This is a discussion on Convert two 32-bit longs to one 64-bit long long within the C Programming forums, part of the General Programming Boards category; Hey guys, What I need is relatively simple. I need to convert two longs (each 4 digits, "0" padded) into ...

  1. #1
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    Convert two 32-bit longs to one 64-bit long long

    Hey guys,

    What I need is relatively simple. I need to convert two longs (each 4 digits, "0" padded) into a single long long.

    e.g.
    long a, b;
    long long c;

    a = 3;
    b = 4;

    sprintf((char*) c,"%04ld%04ld",a,b);

    The result should be c is equal to 00030004. That method doesn't work though. Anyone got any ideas? Do I need to convert it to a string first then to a long long?

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    C++ Witch laserlight's Avatar
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    It sounds like you just want to write:
    Code:
    c = a * 10000 + b;
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
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    Perfect! Makes sense, probably should have figured that out on my own. Thanks!

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