Member Avatar for johans22

Got blue, red and yellow lights that each can turn ON independently of one another. Using operators, structs, etc. how to obtain the current color, if having: Red & Blue is purple, Blue and Yellow is green and Yellow & Red is Orange. This is not a homework.

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For : treat each lamp as a single bit in a mask, combine them with bitwise OR, and map the 3-bit value to a name. That keeps the logic simple, fast and easy to extend. was right to ask for your code; below is a minimal, copy-pasteable pattern you can adapt to your I/O layer. is also right — how you read the lamps (GPIO, serial, etc.) affects debouncing and sampling, so keep that part separate from the color logic.

#include <stdint.h>

enum LightFlags {
    LIGHT_RED    = 1 << 0,  /* 0b001 */
    LIGHT_BLUE   = 1 << 1,  /* 0b010 */
    LIGHT_YELLOW = 1 << 2   /* 0b100 */
};

static const char *color_name[8] = {
    "None",    /* 0 */
    "Red",     /* 1 */
    "Blue",    /* 2 */
    "Purple",  /* 3 = Red+Blue */
    "Yellow",  /* 4 */
    "Orange",  /* 5 = Red+Yellow */
    "Green",   /* 6 = Blue+Yellow */
    "Mixed"    /* 7 = all three */
};

const char *get_color_name(uint8_t mask) {
    return color_name[mask & 0x07]; /* mask guards extra bits */
}

Practical tips: build the mask from your input pins (e.g. (read_red()?LIGHT_RED:0) | ...), validate inputs, and debounce physical switches. Use unsigned types for bit logic and guard array access with mask & 0x07. If perceived colors depend on brightness or LED color profiles (additive vs subtractive mixing), tweak the strings or add HSV/brightness logic instead. If you post the I/O code you have, more targeted fixes (debounce code, interrupt vs polling, thread safety) can be suggested.

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Member Avatar for rproffitt

While not homework this doesn't appear to be the place for "give me code." Supply your work so far and where you are stuck.

Member Avatar for johans22

A good deal.

Member Avatar for rubberman

How you code this depends upon how the lights are integrated into the system. If directly connected to I/O ports of the computer, then you would use io-in and io-out instructions to read or set their states (on or off). If other such as serial ports, the problem is a bit more complicated but not too difficult. What you have posted so far is useless for us to help you.

commented: Lights += 1; +11
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