How to convert binary array to a decimal number in C

Question

I am facing difficulty in converting a binary array to a decimal number:

bin[8] = {10,00,00,10};

I want the equivalent of this array element as a decimal number, i.e. 130.

Your array contains the decimal numbers 10 and 0. If you want a binary number you'd need to represent it as a string, or an array of bits (0 or 1 only). — interjay
– interjay, Commented Mar 27, 2018 at 10:39

Acorn · Accepted Answer · 2018-03-27 10:36:10Z

1

A standard solution goes like this:

int f(char s[])
{
    int n = 0;
    int i;

    for (i = 0; i < 8; ++i) {
        n <<= 1;
        n += s[i] - '0';
    }

    return n;
}

answered Mar 27, 2018 at 10:36

Acorn

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Comments

Alex Liu · Accepted Answer · 2018-03-27 13:21:12Z

0

I think you can follow this code:

int bin_to_dec(char *src, int bits){
    int i, n, sum = 0;
    for (i = 0; i < bits; i++) {
        n = *(src + i) - '0';
        sum += (n * (1 << (bits - (i + 1))));
    }
    return sum;
}

answered Mar 27, 2018 at 13:21

Alex Liu

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