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This tutorial will discuss printing character array using loop in Arduino.

Serial.println()Define intand print character arrays in Arduino

In Arduino, if we intinitialize an array using keyword, we have to use a loop to print its elements.

The character array elements are placed at certain indexes and to print them, we need to get each of them individually. We can do this using a loop in Arduino.

For example, we can use a loop that starts at index 0 and ends with the array length for, which we can length()get using the function. Inside the loop, we will get each array element using its index and print it using the Serial.print()or function.Serial.println()

Serial.print()The function prints the value on a single line, but Serial.println()the function prints the value and moves the cursor to the next line.

For example, let us define a char array and print it on the serial monitor window using a loop in Arduino.

example:

int ch[] = {'a', 'b', 'c'};

void setup() {
  Serial.begin(9600);
  for (int i = 0; i < 3; i++) {
    char c = char(ch[i]);
    Serial.println(c);
  }
}
void loop() {}

Output:

a
b
c

Suppose we use intto define a char array. In this case, the elements will be converted to their ASCII representation, and to print them, we have to char()convert them back to char using the function; that is why we use the function in the above code char().

If we do not use the function in the above code char(), the ASCII value of the character will be printed.

charDefine and Serial.println()print character arrays in Arduino

We can also chardefine a char array using the keyword and we don't have to use a loop to print it. We also don't have to use char()the function because the array is already of char data type.

For example, let us chardefine a loop using keyword and print it on the serial monitor.

example:

char ch[] = {'a', 'b', 'c'};

void setup() {
  Serial.begin(9600);
  Serial.println(ch);
}
void loop() {}

Output:

abc

If we want to print each element in a separate line, we have to use a loop as we have done in the above example. We can also define a char array as a string.

For example, to define the above char array as a string, we can use the following line of code.

char ch[] = "abc";

In the above example, we can get any element of the char array using its index. For example, to get the first array element, we will use the following line of code.

char c = ch[0];

We use 0 because the first element is at index 0 and the character will be stored in cthe variable. We can also replace the characters present in the array.

We need to get the element we want to replace using its index and replace it with the new element.

For example, to replace the first element of the above array, we will use the following line of code.

ch[0] = 'd';

We can also use loops to replace multiple array elements.