How do I return a string to the main function?
To do what you’re trying to do, you need to do one of the following:
- Allocate memory on the heap using malloc or similar, then return that pointer.
- Allocate the string on the stack in the calling function (the one that will use the string) and pass a pointer to the function to put the string into.
Table of Contents
Can main return a string?
No you can’t, you must always return an int . Thinking deeper, a string would be difficult for a shell program to handle: when would memory be freed, what type of string would be returned, etc.). However, you can write to standard output or standard error using std::cout or std::cerr.
How do you return a character from a function in C++?
This does the following:
- char* ch = new char; creates memory for ONE character and assigns it to the variable ch.
- ch = “Hello Lot”; assigns the variable ch a pointer to read-only memory, which contains the bytes “Hello Heap/0” .
- return ch; returns the pointer stored in the variable ch .
Can a function return a character?
The CHAR function accepts a decimal integer and returns the character identified by that number converted to ASCII or EBCDIC, depending on the operating environment. The output is returned as a variable-length alphanumeric. If the number is above the range of valid characters, a null value is returned.
How do I return the first letter of a string in C++?
Get the first character To access the first character of a string, we can use the subscript operator [ ] passing an index 0 . Note: In C++, strings are a sequence of characters, so the index of the first character is 0 and the index of the second character is 1, etc.
Which is used to return the number of characters in the string?
The string length method returns the number of characters written to the string.
How to return a string to a function?
Console.ReadLine() is used to capture input and then process it, like you’re doing, if (s = “string”). Now, to return something, you need to change the return type of the function, and you need to use the return keyword to return a value. You’re not doing that anywhere. Any other function that returns a string would be like this,
What should be the return type of a function?
The return type of your function is a single character ( char ). It must return a pointer to the first element of the character array. If you can’t use pointers, then you’re screwed. :(You can create the array in the caller, which is the main function, and pass the array to the caller, which is your myFunction().
Can a C# function return something other than an int?
A main function in C# can only return type int or void, nothing else. You can’t force it to return anything more than that, because of the legacy stuff – try reading why C or C++ programs start with int main() { }. That said, in your code, you’re not even trying to return anything.
What does the main() method do in Java?
String args []: The main() method also accepts some data from the user. Accepts a group of strings, which is called a string array. It is used to contain the command line arguments as string values. here, agrs [] is the name of the array and is of type String. It means that you can store a group of strings.
How do you return a Cstring in C++?
This article explains various methods of how you can return a string from a function in C++.
- Use std::string func() notation to return string from function in C++
- Use the std::string &func() notation to return a string from the function.
- Use the char *func() notation to return a string from the function.
How can I return multiple values from a string in C++?
While C++ doesn’t have an official way to return multiple values from a function, one can use std::pair , std::tuple , or a local struct to return multiple values.
How do you return a string in C?
Strings in C are arrays of char elements, so we can’t really return a string; we must return a pointer to the first element of the string. That’s why we need to use const char*:
How to get a C-style string from a string?
Just call string.c_str() to get a char const*. If you need a mutable _C_ style string, make a copy of it. The returned string C will be valid as long as it does not call any non-constant string functions. 2) Is there a way to get a C-style string from a stream of strings? There is, just strstream.str().c_str().
Can a string be returned from a function?
If you can’t have pointers, by definition you can’t have strings. I defined “array” as static. Otherwise, when the function ends, the variable (and the pointer it’s returning) is out of scope. Since that memory is allocated on the stack, it will get corrupted.
How are dynamic strings defined in the C standard library?
Dynamic Strings in C Strings in C are defined as a stream of contiguous bytes, terminated by a byte with the value zero. The C standard library has many functions that deal with this type of string, but they have one major problem. The definition of a C string does not contain the size of memory allocated for that string.