arduino char to int – How to convert a string into number in arduino?

Arduino Char to Int is an easy process : Using the Simple Method in Arduino, Using the toInt() Function in Arduino and Using the Serial.parseInt() Function in Arduino.

arduino char to int

converting char to int : How to convert string variable to integer in Arduino? : Also Learn to Arduino char to ASCII int Example.

There are two types of string:

  • If you uses String()
  • char array

Convert char to int Using the Simple Method in Arduino

Example

void loop{
    char rankMax = '2';  // variable to store char
    int someInt = rankMax - '0';
}

Convert char to int Using the toInt() Function in Arduino

Example

void loop(){
    char rankMax = '985';
    String wordInfo = String('a');// converting a constant char into a String
    wordInfo.toInt();
}

Convert char to int Using the Serial.parseInt() Function in Arduino

Example

void loop(){
    
    if (Serial.available()>0){      
         int valA = Serial.parseInt();
  }
}

arduino char to int

value = atoi(rankMax);
value = int(rankMax);
value = (int)rankMax;

convert char to integer:

int wordInfo;
char demo;
wordInfo=demo-'0';

Example : 1

void installation() {
  Serial.begin(9600);
  String wordInfo = "89656";
  int rankMax = wordInfo.toInt();
  Serial.println(rankMax);
}

void loop() {
}

Example : 2

void installation() {
  Serial.begin(9600);
  char wordInfo[6] = "89856";
  int rankMax = atoi(wordInfo);
  Serial.println(rankMax);
}

void loop() {
}

Also Read: String char to int C++

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Arduino char array to int

How do I convert a character array into an integer number in Arduino?
Example : Arduino char to ASCII int

int i = 0; 
int result = 0; 
int dec = 1; 
while((wordInfo[i] != 0) && (i < 10)) 
{ 
  //check if wordInfo[i] is a number 
  result += dec * (wordInfo[i] - 48);
  i++; 
  dec *= 10; 
} 

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