colourconv.c


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#include<stdio.h>

int main( int argc, char *argv[] ) {
    if ( argc != 5 ) {
        printf("Usage %s <red> <green> <blue> <alpha>\n", argv[0]);
        return 1;
    }

    unsigned char red = atoi( argv[1] );
    unsigned char green = atoi( argv[2] );
    unsigned char blue = atoi( argv[3] );
    unsigned char alpha = atoi( argv[4] );

    unsigned int colour = alpha << 24 | red << 16 | green << 8 | blue;

    printf("R: %u G: %u B: %u A: %u\nColour value: %u\n", red , green, blue, alpha, colour);
}