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/****************************************************************************** Welcome to GDB Online. GDB online is an online compiler and debugger tool for C, C++, Python, PHP, Ruby, C#, VB, Perl, Swift, Prolog, Javascript, Pascal, HTML, CSS, JS Code, Compile, Run and Debug online from anywhere in world. Gabriel Staples www.ElectricRCAircraftGuy.com 22 Dec. 2020 arduino_test_setLed - demonstrate an alternative way to initialize an array of structs in C++, inside a function. - Note: this is most useful when struct contents need to be changed often, not necessarily when initializing a struct once. See: [my ans] https://arduino.stackexchange.com/questions/80236/initializing-array-of-structs/80289#80289 Share link: https://onlinegdb.com/9zl7Fth0f *******************************************************************************/ #include <stdint.h> #include <stdio.h> // Get the number of elements in an array #define ARRAY_LEN(array) (sizeof(array)/sizeof(array[0])) constexpr uint8_t NUM_LEDS = 3; struct Led { uint8_t current; uint8_t start; uint8_t target; uint32_t startTime; uint16_t duration; }; // To initialize once at construction. This form of initialization can be // used anywhere: both inside and outside functions. Led leds[NUM_LEDS] = { { 1, 2, 3, 4, 5}, { 6, 7, 8, 9, 10}, {11, 12, 13, 14, 15}, }; // Print the full contents of an array of `Led` structs void printLeds(const Led ledArrayIn[], size_t ledArrayLen) { for (size_t i = 0; i < ledArrayLen; i++) { printf("ledArrayIn[%lu]\n" "current = %u\n" "start = %u\n" "target = %u\n" "startTime = %u\n" "duration = %u\n\n", i, ledArrayIn[i].current, ledArrayIn[i].start, ledArrayIn[i].target, ledArrayIn[i].startTime, ledArrayIn[i].duration); } } int main() { printf("Hello World\n\n"); printLeds(leds, ARRAY_LEN(leds)); printf("==============\n\n"); // Do this to set or change the structs at any time AFTER construction! // This variable (re)assignment is only allowed inside of a function, NOT // in the global scope outside of all functions! leds[0] = {10, 20, 30, 40, 50}; leds[1] = {60, 70, 80, 90, 100}; leds[2] = { 0, 0, 255, 0, 300}; printLeds(leds, ARRAY_LEN(leds)); return 0; } /* SAMPLE OUTPUT: Hello World ledArrayIn[0] current = 1 start = 2 target = 3 startTime = 4 duration = 5 ledArrayIn[1] current = 6 start = 7 target = 8 startTime = 9 duration = 10 ledArrayIn[2] current = 11 start = 12 target = 13 startTime = 14 duration = 15 ============== ledArrayIn[0] current = 10 start = 20 target = 30 startTime = 40 duration = 50 ledArrayIn[1] current = 60 start = 70 target = 80 startTime = 90 duration = 100 ledArrayIn[2] current = 0 start = 0 target = 255 startTime = 0 duration = 300 */

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