integer array issue with Serial.Print function

Projects Programming
1

Could somebody help me to understand why my Serial.Print loop works nicely when I declare a FOUR element integer array by writing int16_t cmps[3] = {0}; but the same Serial.Print loop only prints a single line when I declare a three element integer array by writing int16_t cmps[2] ?

All I am trying to do is to repeatedly print three integer values - namely cmps[0], cmps[1] and cmps[2] that keep getting updated.

I find that I only get a single line output when declare the integer array with 3 elements, ie. int16_t cmps[2]. So my output would just be 1 line.

70 -88 -116

But once I declare the array with 4 integers, such as int16_t cmps[3], then the loop always works properly, such as with outputs:

62 -92 -120
68 -90 -124
66 -86 -124
69 -89 -121
68 -84 -118
66 -84 -120
68 -90 -118
(and the lines just keep building forever).

Would someone be able to let me know why my Serial.Print code only works properly when I declare my integer array to be larger than what I need? That is everything works excellently when I declare the array (cmps) with 4 elements, while declaring with 3 elements causes my code to print a single line of values (then seemingly gets jammed).

Thanks in advance!

Kenny

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int16_t cmps[2] = {0};

void loop()
{
// Print all sensor values which the sensor provides
// Formated all values as x, y, and z in order for
// Compass, Gyro, Acceleration. The First value is
// the temperature.
I2Cdev::writeByte(MAG_I2C_ADDY, MAG_CNTL, 0x00);
delay(10);
I2Cdev::writeByte(MAG_I2C_ADDY, MAG_CNTL, 0x01);
delay(10);

cmps[0] = readMAG(0x03, 0x04);
cmps[1] = readMAG(0x05, 0x06);
cmps[2] = readMAG(0x07, 0x08);

Serial.print(cmps[0]);Serial.print(" ");Serial.print(cmps[1]);Serial.print(" ");Serial.print(cmps[2]);
Serial.println();
delay(100);
}

==============================

2

int16_t cmps[2]

is a 2 element array. cmps[0] and cmps[1]; (Indexed from 0. Max array index is 1 less than the number in the array size declaration)

for 3 elements, you need int16_t cmps[3].

3

arduinodlb:
int16_t cmps[2]

is a 2 element array. cmps[0] and cmps[1]; (Indexed from 0. Max array index is 1 less than the number in the array size declaration)

for 3 elements, you need int16_t cmps[3].

Thanks very much ard-dlb! I didn't know that at all before. That really helped me tremendously. Very kindly appreciated.

Kenny