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Comment by uecker

2 months ago

It is not even possible to do arithmetic on char in C.

3 comments

uecker

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pjmlp  2 months ago 

    #include <stdio.h>

    unsigned int pack_rgb(unsigned char r, unsigned char g, unsigned char b) {
        return (r << 16) | (g << 8) | b;
    }

    unsigned int pack_rgb_arith(unsigned char r, unsigned char g, unsigned char b) {
        return (r * 65536) + (g * 256) + b;
    }

    int main(void)
    {
        printf("The color value of (246, 176, 223) is %d\n", pack_rgb(246, 176, 223));
        printf("The color value of (246, 176, 223) is %d\n", pack_rgb_arith(246, 176, 223));
    }

Compiler Explorer link, https://godbolt.org/z/3jExdaTT9

I would expect a better comment from someone working on the standard.