Thread: How can you take a string of numbers and turn it into an array of integers?

  1. #1
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    How can you take a string of numbers and turn it into an array of integers?

    I know strings are essentially just arrays of characters, so what would be the easiest way to take each individual digit and put it into a separate space in an array?

    ex.) *str = "90210"

    array[0] = 9
    array[1] = 0
    array[2] = 2
    array[3] = 1
    array[4] = 0

    all my attempts at achieving this just result in an array full of garbage numbers

    what ive done is:

    Code:
    int *array;
    array = malloc(sizeof(int)*(strlen(str));
    
    for(i=0; i<strlen(str); i++)
    {
    array[i] = str[i]
    }
    any help with this would be greatly appreciated.

    also, I should mention that the string will be defined in main, and its converted into an array in a separate function.

  2. #2
    C++ Witch laserlight's Avatar
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    Hint: subtract '0' from each character, assuming (or having checked) that it is in the range of '0' to '9'.
    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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    that worked, thank you!

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