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Convert string to lowercase or uppercase in Arduino
In order to convert a string to lower/upper case, the in-built .toLowerCase() and .toUpperCase() functions can be used.
Note: These functions change the original string itself, and don't return a new string with the changes.
The implementation is shown below −
Example
void setup() {
Serial.begin(9600);
Serial.println();
String s1 = "Hello World";
Serial.println(s1);
s1.toLowerCase();
Serial.println(s1);
s1.toUpperCase();
Serial.println(s1);
}
void loop() {
// put your main code here, to run repeatedly:
}The corresponding Serial Monitor output is −
Output
As you can see, the changes have been made in s1 itself. The return of .toUpperCase() and .toLowerCase() is void.
Updated on: 24-Mar-2021
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