Converting string to int

Programming Questions

dedz9060

in Programming Questions • 1 year ago

Hey everyone, Iv never posted here before, I normally find what I need on here quite easily but I am now stuck.

I have search the forum for this issue and tried everything that has already been suggested but its still not working.

the program is designed to take a temperature reading from an Arduino Uno and use it as an int to be displayed on screen.

here are all the variables I'm using

int DT = 40; // Desired temp

int AT = 0; // Actual temp

int lf = 10; // line feed end signal sent by arduino

Serial myPort; // The serial port

String in = null ; //received string

this is the code I'm using to read the serial input and then convert the string

while (myPort.available() > 0)

{

in = myPort.readStringUntil(lf);

if (in == null)

{

}

else if (in != null )

{

AT = int(in);

print(in); //test

print (" / "); // test

println (AT); //test

}

any help or suggestions would be welcomed.

Thanks

Dedz

Replies(5)

quarks

I assume that the problem is with this line where you attempt to cast a string to an int
AT = int(in);

the solution is

AT = Integer.parseInt(in);

This will work provided 'in' represents an actual integer value otherwise it will crash.

dedz9060

Re: Converting string to int

1 year ago

Yea 'in' wasn't an integer it was actually a float, perhaps I shouldn't code until midnight any more.

thank you this now works. I hate it when answers are simple stupid mistakes.

Dedz

alkopop79

Re: Converting string to int

10 months ago

I wonder why do I get this error:

"Cannot convert from int[] to int"

import processing.serial.*;
Serial myPort;
int memorySize = 35536;
int count;
void setup() {
println(Serial.list());
myPort=new Serial(this, Serial.list()[0], 9600);
}
void draw() {
String lines[] = loadStrings("all.rom");
for (int i=0; i<memorySize; i++) {
int byt = int(lines);
println(byt);
count++;
if (count==64) {
delay(100);
count=0;
}
if (i==memorySize) {
break;
}
}
}

andreas.s..

Re: Converting string to int

10 months ago

lines is of type String-array so you need to specify which item of the array you want to convert to int, for example:

int byt = int(lines[0]);

assuming lines contains at least 1 item.

if you want to iterate through array lines you can use

for( String line : lines ) {
int byt = int( line );
// etc.
}

alkopop79

Re: Converting string to int

10 months ago

Thank you! Fantastic!

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