string.concat(parameter) Parameters. This shows you the available member functions (scroll down for links). Yes, because "A" is a string with one character in it, whereas 'A' is a character constant that is equivalent to the ASCII code for capital A. Go Down. Appending to Strings using the += operator and concat() Examples of how to append different data types to strings created 27 July 2010 modified 4 Sep 2010 by Tom Igoe ... Corrections, suggestions et nouvelle documentation peuvent être postées sur le Forum Arduino ou à l'adresse suivante : … Strings are also useful for storing the user input. Appends the parameter to a String Syntax. The second String is appended to the first, and the result is placed in a new String. The Arduino String, which lets us use a string object in a sketch. Arduino string (c style strings) For C object Strings an ok place to look is the Arduino c string Reference. In memory, a constant like "A" will generate two bytes, one containing the ASCII code for A, and the other holding a zero byte to indicate end-of-string. Arduino Stack Exchange is a question and answer site for developers of open-source hardware and software that is compatible with Arduino. For example, the characters that a user types on a keypad connected to the Arduino. Besides, the compiler should give you a warning for that like "warning: deprecated conversion from string constant to 'char*'", which tells you that you're probably doing something wrong (g++ version 4.7.4 does for me, even without -Wall). Arduino Forum > Using Arduino > Programming Questions > concat a char or a String; Print. concat a char or a String.
Strings are also useful for storing the user input. Arduino String References Arduino String Objects. On the other hand, this would initialize chary to be a string that you can modify: For C object Strings a good place to look is the Arduino String Reference. How are defining them? Parameters. The concat function does not implement a float version, but some of char, int, unsigneds... unsigned char String::concat(long unsigned int) unsigned char String::concat(unsigned int) unsigned char String::concat(int) ... so the compiler does not know how to cast (truncating probably the float) to integer, as there are several options. Like the + operator, these operators are handy for assembling longer strings from a combination of data objects. Appends the parameter to a String Syntax. parameter: Allowed types are String, string, char, byte, int, unsigned int, long, unsigned long, float, double, __FlashStringHelper(F() macro). If they are initialized as arrays of characters like this:char exampleCString[50] = "This is a C string"; then you can use strcat() function in c: strcat(str1,str2); Make sure str1 is big enough, because the result goes there. Combines, or concatenates two Strings into one new String. String.
myString3 = myString1 + myString2. ... but instead use the C functions to concatenate strings (like strcat, strncat).