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Questions tagged [char]

char refers to the character data-type, representing letters, digits, punctuation marks, control characters, etc. Use this tag for questions relating to and usage of the character data-type.

The keyword char is used in many programming languages, often defining a 1-byte memory location representing ASCII, UTF-8, UTF-16, UTF-32, and ISO-8895-1 character encodings. Arrays of characters can create Strings used to form words, descriptive text, or even extremely large numbers unable to be represented exactly by 32 or 64 bits.

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How to convert char to integer in C?

Possible Duplicates: How to convert a single char into an int Character to integer in C Can any body tell me how to convert a char to int? char c[]={'1',':','3'}; int i=int(c[0]); printf("%d",i); When I try this it gives 49.
Cute
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Check string for palindrome

A palindrome is a word, phrase, number or other sequence of units that can be read the same way in either direction. To check whether a word is a palindrome I get the char array of the word and compare the chars. I tested it and it seems to work.…
DarkLeafyGreen
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In Java, is the result of the addition of two chars an int or a char?

When adding 'a' + 'b' it produces 195. Is the output datatype char or int?
orange
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Converting an int or String to a char array on Arduino

I am getting an int value from one of the analog pins on my Arduino. How do I concatenate this to a String and then convert the String to a char[]? It was suggested that I try char msg[] = myString.getChars();, but I am receiving a message that…
Chris
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Java Switch Statement - Is "or"/"and" possible?

I implemented a font system that finds out which letter to use via char switch statements. There are only capital letters in my font image. I need to make it so that, for example, 'a' and 'A' both have the same output. Instead of having 2x the…
GlassZee
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Ruby - How to select some characters from string

I am trying to find a function for select e.g. first 100 chars of the string. In PHP, there exists the substr function Does Ruby have some similar function?
user1946705
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Converting a char to uppercase in Java

How could I get the f and l variables converted to uppercase? String lower = Name.toLowerCase(); int a = Name.indexOf(" ",0); String first = lower.substring(0, a); String last = lower.substring(a+1); char f = first.charAt(0); char l =…
shep
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How can I convert a char to int in Java?

(I'm new at Java programming) I have for example: char x = '9'; and I need to get the number in the apostrophes, the digit 9 itself. I tried to do the following, char x = 9; int y = (int)(x); but it didn't work. So what should I do to get the…
Haim Lvov
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"Too many characters in character literal error"

I'm struggling with a piece of code and getting the error: Too many characters in character literal error Using C# and switch statement to iterate through a string buffer and reading tokens, but getting the error in this line: case '&&': case…
Jinx
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How to get the real and total length of char * (char array)?

For a char [], I can easily get its length by: char a[] = "aaaaa"; int length = sizeof(a)/sizeof(char); // length=6 However, I cannot do like this to get the length of a char * by: char *a = new char[10]; int length =…
herohuyongtao
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How to generate a random String in Java

I have an object called Student, and it has studentName, studentId, studentAddress, etc. For the studentId, I have to generate random string consist of seven numeric charaters, eg. studentId = getRandomId(); studentId = "1234567" <-- from the random…
chandra wibowo
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Comparing chars in Java

I want to check a char variable is one of 21 specific chars, what is the shortest way I can do this? For example: if(symbol == ('A'|'B'|'C')){} Doesn't seem to be working. Do I need to write it like: if(symbol == 'A' || symbol == 'B' etc.)
Alex
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How can I check if char* variable points to empty string?

How can I check if char* variable points to an empty string?
Aan
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Best way to check if a character array is empty

Which is the most reliable way to check if a character array is empty? char text[50]; if(strlen(text) == 0) {} or if(text[0] == '\0') {} or do i need to do memset(text, 0, sizeof(text)); if(strlen(text) == 0) {} Whats the most efficient way…
ZPS
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In Java, how to find if first character in a string is upper case without regex

In Java, find if the first character in a string is upper case without using regular expressions.
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