Array after a while showing 0

Projects Programming
1

Hi guys, I write a sketch to reading the array integer from serial monitor but it showing 0 numbers. I have no zero as an array in my sketch. how can I solve this problem ?

thanks.

Screenshot 2022-03-16 192223
Screenshot 2022-03-16 192223834×659 9.53 KB

the sketch:

int my_array[3417] {554, 538, 522, 501, 484, 470, 457, 441, 436, 428, 418, 410, 409, 391, 377, 364, 356, 350, 333, 345, 344, 357, 351, 361, 368, 359, 370, 376, 393, 389, 395, 397, 413, 426, 441, 450, 466, 480, 503, 522, 538, 554, 570, 582, 593, 596, 606, 613, 610, 622, 639, 650, 651, 667, 670, 670, 669, 671, 663, 676, 661, 670, 640, 652, 640, 626, 615, 619, 596, 582, 569, 555, 537, 522, 503, 485, 471, 456, 439, 435, 423, 419, 411, 409, 388, 380, 365, 351, 356, 339, 336, 344, 351, 347, 381, 373, 366, 390, 402, 401, 405, 417, 435, 451, 465, 492, 518, 533, 550, 568, 586, 589, 603, 609, 616, 625, 638, 647, 659, 669, 674, 666, 669, 665, 651, 655, 639, 636, 628, 621, 617, 594, 573, 557, 538, 516, 493, 473, 459, 445, 435, 423, 410, 415, 393, 382, 357, 340, 344, 345, 331, 354, 350, 362, 359, 373, 394, 389, 397, 407, 419, 433, 449, 473, 490, 511, 535, 555, 565, 582, 591, 597, 613, 619, 628, 647, 653, 663, 668, 670, 670, 665, 672, 663, 653, 650, 634, 638, 618, 615, 592, 576, 555, 532, 513, 490, 473, 452, 441, 430, 419, 412, 409, 395, 373, 356, 360, 342, 340, 344, 356, 352, 359, 362, 383, 379, 394, 394, 405, 421, 440, 452, 474, 494, 518, 541, 555, 570, 587, 592, 605, 615, 622, 637, 644, 656, 666, 673, 684, 672, 669, 668, 670, 642, 654, 638, 632, 614, 605, 586, 567, 552, 531, 505, 489, 465, 449, 439, 424, 419, 406, 402, 385, 364, 353, 340, 336, 339, 345, 353, 355, 352, 368, 383, 398, 393, 397, 406, 423, 440, 460, 483, 500, 518, 540, 558, 578, 590, 598, 606, 616, 622, 635, 644, 664, 665, 668, 671, 668, 664, 681, 651, 652, 651, 638, 628, 610, 601, 587, 564, 549, 521, 506, 484, 465, 447, 433, 425, 414, 406, 402, 381, 374, 347, 348, 349, 340, 355, 355, 362, 363, 380, 378, 384, 391, 411, 412, 429, 444, 459, 484, 498, 523, 543, 561, 578, 588, 595, 608, 610, 621, 637, 646, 662, 669, 672, 681, 667, 670, 656, 678, 645, 646, 631, 627, 617, 596, 578, 559, 541, 523, 498, 482, 467, 447, 436, 429, 418, 408, 395, 372, 363, 345, 358, 352, 334, 347, 366, 363, 367, 384, 394, 390, 414, 405, 418, 431, 448, 463, 486, 505, 525, 543, 563, 578, 591, 600, 607, 618, 624, 634, 660, 664, 666, 676, 669, 672, 679, 663, 658, 661, 634, 627, 635, 614, 592, 576, 557, 536, 517, 497, 476, 459, 444, 431, 418, 409, 403, 402, 367, 345, 350, 349, 339, 345, 345, 347, 360, 366, 373, 377, 386, 395, 397, 416, 430, 448, 468, 485, 511, 532, 549, 562, 580, 593, 603, 611, 623, 624, 644, 651, 660, 679, 674, 669, 667, 667, 658, 656, 653, 635, 632, 632, 611, 593, 578, 556, 540, 516, 494, 472, 453, 438, 431, 419, 414, 408, 393, 372, 364, 361, 340, 335, 340, 351, 352, 355, 371, 378, 382, 391, 393, 400, 419, 436, 452, 471, 493, 513, 540, 556, 573, 585, 596, 599, 612, 615, 631, 643, 662, 662, 666, 680, 676, 671, 672, 670, 661, 644, 628, 629, 625, 605, 589, 570, 553, 532, 511, 490, 472, 450, 437, 424, 421, 407, 406, 394, 370, 359, 346, 341, 341, 341, 355, 347, 370, 362, 374, 382, 400, 395, 410, 419, 439, 455, 473, 495, 516, 537, 556, 577, 589, 597, 604, 616, 620, 636, 648, 653, 671, 672, 673, 667, 669, 662, 668, 669, 637, 649, 625, 613, 608, 588, 572, 553, 528, 506, 485, 468, 451, 436, 427, 412, 407, 395, 385, 375, 348, 344, 345, 352, 344, 351, 353, 363, 364, 373, 395, 387, 404, 410, 422, 441, 459, 479, 499, 520, 544, 559, 575, 586, 597, 607, 618, 621, 635, 646, 664, 687, 675, 672, 665, 683, 668, 660, 656, 654, 638, 638, 618, 604, 582, 561, 542, 523, 500, 483, 463, 447, 432, 425, 416, 417, 394, 380, 374, 351, 343, 344, 337, 357, 355, 360, 362, 385, 385, 378, 395, 398, 412, 427, 442, 464, 481, 502, 523, 544, 565, 577, 588, 602, 605, 611, 623, 633, 653, 659, 672, 672, 668, 669, 666, 658, 652, 641, 642, 639, 626, 620, 597, 580, 564, 545, 523, 501, 483, 463, 444, 438, 425, 415, 404, 392, 372, 372, 360, 337, 334, 344, 353, 354, 362, 368, 371, 377, 381, 396, 389, 418, 428, 445, 463, 484, 503, 529, 547, 562, 582, 590, 596, 611, 613, 621, 643, 653, 668, 667, 676, 674, 667, 669, 663, 655, 648, 636, 641, 628, 620, 591, 577, 560, 538, 519, 498, 477, 459, 447, 433, 424, 417, 407, 398, 385, 359, 364, 333, 341, 333, 353, 347, 364, 371, 381, 379, 387, 392, 405, 413, 432, 446, 469, 490, 507, 533, 552, 567, 583, 591, 602, 610, 611, 631, 643, 655, 663, 668, 677, 677, 673, 659, 668, 649, 659, 633, 629, 626, 611, 590, 572, 559, 533, 513, 498, 472, 457, 440, 429, 423, 410, 412, 389, 378, 368, 352, 332, 349, 350, 355, 356, 364, 367, 380, 383, 389, 403, 401, 422, 433, 453, 471, 494, 515, 537, 555, 573, 588, 592, 601, 618, 613, 638, 643, 659, 664, 675, 668, 667, 668, 662, 661, 654, 645, 635, 634, 613, 612, 589, 571, 554, 532, 507, 488, 471, 449, 440, 428, 415, 409, 402, 385, 374, 364, 351, 340, 358, 343, 345, 361, 353, 369, 373, 387, 385, 395, 417, 426, 443, 458, 479, 500, 518, 538, 558, 577, 584, 600, 606, 628, 623, 626, 645, 661, 664, 670, 668, 667, 668, 663, 664, 672, 639, 633, 627, 620, 605, 586, 567, 547, 528, 504, 489, 475, 454, 434, 425, 417, 410, 402, 378, 367, 358, 343, 334, 343, 355, 363, 365, 369, 375, 373, 389, 401, 403, 410, 423, 441, 463, 478, 501, 523, 541, 561, 573, 587, 597, 608, 615, 617, 636, 653, 661, 666, 670, 667, 671, 664, 662, 660, 645, 641, 646, 623, 624, 601, 585, 565, 550, 523, 503, 482, 463, 448, 437, 428, 416, 404, 393, 380, 366, 347, 344, 336, 341, 345, 362, 366, 368, 374, 382, 387, 396, 396, 413, 427, 445, 462, 484, 506, 525, 547, 561, 578, 588, 593, 609, 611, 620, 642, 645, 662, 669, 673, 671, 671, 667, 680, 662, 664, 655, 624, 624, 617, 597, 582, 561, 544, 522, 498, 479, 460, 444, 432, 424, 413, 401, 388, 380, 359, 351, 345, 343, 349, 347, 362, 367, 377, 368, 375, 389, 389, 389, 416, 434, 444, 466, 488, 506, 532, 546, 565, 579, 589, 600, 608, 612, 626, 641, 651, 660, 671, 673, 673, 671, 672, 658, 661, 653, 643, 632, 624, 614, 595, 577, 559, 535, 518, 498, 476, 458, 444, 429, 420, 416, 407, 391, 376, 357, 344, 336, 334, 333, 342, 351, 364, 379, 368, 381, 393, 407, 397, 418, 432, 448, 469, 489, 513, 530, 554, 568, 584, 593, 603, 611, 614, 630, 645, 657, 670, 663, 674, 667, 672, 665, 664, 655, 651, 642, 635, 614, 611, 586, 576, 552, 534, 516, 493, 473, 452, 440, 431, 420, 411, 413, 398, 375, 354, 347, 330, 351, 341, 358, 359, 366, 377, 380, 388, 384, 397, 412, 423, 437, 456, 470, 495, 515, 537, 564, 571, 583, 591, 603, 611, 617, 629, 642, 657, 666, 673, 675, 671, 666, 662, 670, 646, 642, 641, 636, 615, 608, 588, 568, 553, 530, 508, 491, 467, 452, 439, 426, 421, 406, 414, 384, 376, 358, 346, 336, 340, 355, 355, 362, 359, 371, 379, 393, 396, 396, 406, 423, 438, 458, 475, 497, 520, 539, 557, 574, 587, 595, 604, 618, 616, 637, 652, 657, 676, 669, 668, 669, 661, 667, 664, 654, 647, 627, 621, 624, 605, 585, 569, 549, 531, 507, 485, 467, 450, 435, 433, 417, 408, 406, 389, 368, 358, 347, 341, 346, 348, 360, 350, 369, 365, 380, 395, 395, 407, 411, 427, 447, 460, 483, 504, 524, 546, 558, 579, 588, 597, 610, 617, 622, 632, 646, 658, 669, 672, 670, 666, 671, 669, 662, 644, 647, 632, 623, 615, 599}; // an array with 5 integer elements

void setup() {
  Serial.begin(115200);
}

void loop() {
  for (int i = 0; i < 3417; i++) {
    Serial.println(my_array[i]);
  }
}
2

Clever comment!

// an array with 5 integer elements

The array contains neither 3417 nor 5 elements, so why are you trying to print 3417 values?

Which Arduino are you using?

3

5 integer is from another example I copied it's just a comment.
I want to reading 3417 integers from array. the board is MEGA2560

4

What board?
UNO is too small...

Not enough memory; see https://support.arduino.cc/hc/en-us/articles/360013825179 for tips on reducing your footprint.
Error compiling for board Arduino Uno.
5

the board is MEGA2560

6

First, you need to store 3417 elements.

7

how ? I trying with 38 integer but the problem is the same as before.

Screenshot 2022-03-16 193723
Screenshot 2022-03-16 193723829×666 9.4 KB 

int my_array[38] {554, 538, 522, 501, 484, 470, 457, 441, 436, 428, 418, 410, 409, 391, 377, 364, 356, 350, 333}; // an array with 5 integer elements

void setup() {
  Serial.begin(115200);
}

void loop() {
  for (int i = 0; i < 38; i++) {
    Serial.println(my_array[i]);
  }
}
8

What do you perceive to be the problem?

9

why showing 0 numbers ?

10

Because you didn't fill the array, so crt0 filled it for you

11 
int my_array[38] {554, 538, 522, 501, 484, 470, 457, 441, 436, 428, 418, 410, 409, 391, 377, 364, 356, 350, 333}; // an array with 5 integer elements

This array does not contain 38 elements.

First, you need to store 38 elements, before you can print out 38.

Have a cup of coffee! You are slow on the uptake today.

12

and how can I solve this problem ?

13

Yes, it does.
The "[38]" says it does.

14

Oops! I defer to greater insight.

15

It's unclear to me what the "problem" is.

There's a very strong smell of X-Y here

16

The "38" example contains 19 elements. I suspect that the OP does not understand that an int takes up two bytes (on some Arduinos).

17

really, the preferred method is declare array[] = {0, 1, 2, 3...} and let the preprocessor set size. then use sizeof in loop.

I suspect the C++ compiler builds a sparse-array.

18

...whatever is appropriate to the unstated requirement.

1 Like
19

Try this:

int array[] {554, 538, 522, 501, 484, 470, 457, 441, 436, 428, 418, 410, 409, 391, 377, 364, 356, 350, 333}; // an array with 5 integer elements


void setup() {
  Serial.begin(115200);
  int size = sizeof(array) / sizeof(array[0]);
  Serial.print("size = "); Serial.println(size);
  for (int i = 0; i < size; i++) Serial.println(array[i]);
}

void loop() {
}
1 Like
20

+1

-Ray

1 Like