06.08.2020»»четверг

Dev C++ Get Data From Function

06.08.2020
Dev C++ Get Data From Function Average ratng: 5,7/10 8060 votes

Apr 09, 2020  You can't call that function in a loop to read the file line-by-line because the file pointer is destroyed as soon as the function returns to it's caller. You need to call that function only once, then have that function read each line in a loop. You will most likely have. File Handling in C. File Handling concept in C language is used for store a data permanently in computer. Using file handling we can store our data in Secondary memory (Hard disk). Why use File Handling in C. For permanet storage. The transfer of input - data or output - data from one computer to another can be easily done by using files.

  1. Landoop Fast Data Dev

In this C++ tutorial, I’ll be teaching you how to do math functions in C++. I’m going to use the addition and subtraction operators and I’m also going to show you some other mathematical functions.

First, we’re going to need to include our library by entering the above coding.

Next, we’re going to enter two integers, along with Enter commands for those integers. Now, I’m going to show you how to add a real number.

Using this example, I am going to show you how to compile a file. I am going to select Compile & Run from under the Execute menu.

In the Compile Progress window, I am going to select Log. This will then bring up the .exe file where you can enter any two numbers that you want. I am going to enter 23 and 12:

Instead of adding, you can also have the program subtract, divide, and multiply. You can do anything you want, really; this is just a simple math function in C++. Now, I am going to show you how to use a math function in Dev-C++.

For this, we only need one variable. I also need to create an alphabetical value. I am going to choose Z, and equal it to a value of 2.

Next, I need to take the square of a number. I’m going to use a float function and set the result to be the power of the number that I want to square.

Next, I’m going to Execute the Compile & Run function again.

As we see here, I have an error. I forgot to add the following math function:

After correcting this error, I am going to try to Compile & Run again. You can see in the screenshot that it worked! The command will tell me to enter any number I wish.

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I am going to enter 16. The result, accurately following the function’s logic, will be 256.

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(until C++17)
(until C++17)(until C++17)(until C++17)(until C++17)
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std::function
Member functions
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(until C++17)
Deduction guides(C++17)
template<class>
class function;/* undefined */
(since C++11)
template<class R, class.. Args>
class function<R(Args..)>;
(since C++11)

Class template std::function is a general-purpose polymorphic function wrapper. Instances of std::function can store, copy, and invoke any Callabletarget -- functions, lambda expressions, bind expressions, or other function objects, as well as pointers to member functions and pointers to data members.

The stored callable object is called the target of std::function. If a std::function contains no target, it is called empty. Invoking the target of an emptystd::function results in std::bad_function_call exception being thrown.

std::function satisfies the requirements of CopyConstructible and CopyAssignable.

  • 2Member functions

[edit]Member types

Type Definition
result_typeR
argument_type(deprecated in C++17)(removed in C++20)T if sizeof..(Args)1 and T is the first and only type in Args..
first_argument_type(deprecated in C++17)(removed in C++20)T1 if sizeof..(Args)2 and T1 is the first of the two types in Args..
second_argument_type(deprecated in C++17)(removed in C++20)T2 if sizeof..(Args)2 and T2 is the second of the two types in Args..

[edit]Member functions

constructs a new std::function instance
(public member function)[edit]
destroys a std::function instance
(public member function)[edit]
assigns a new target
(public member function)[edit]
swaps the contents
(public member function)[edit]
(removed in C++17)
assigns a new target
(public member function)[edit]
checks if a valid target is contained
(public member function)[edit]
invokes the target
(public member function)[edit]
Target access
obtains the typeid of the stored target
(public member function)[edit]
obtains a pointer to the stored target
(public member function)[edit]

[edit]Non-member functions

(C++11)
specializes the std::swap algorithm
(function template)[edit]
(removed in C++20)
compares a std::function with nullptr
(function template)[edit]

[edit]Helper classes

(C++11)(until C++17)
specializes the std::uses_allocator type trait
(class template specialization)[edit]

[edit]Deduction guides(since C++17)

Function

Landoop Fast Data Dev

[edit]Notes

Care should be taken when a std::function whose result type is a reference is initialized from a lambda expression without a trailing-return-type. Due to the way auto deduction works, such lambda expression will always return a prvalue. Hence, the resulting reference will usually bind to a temporary whose lifetime ends when std::function::operator() returns.

[edit]Example

Possible output:

[edit]See also

(C++11)
the exception thrown when invoking an empty std::function
(class)[edit]
(C++11)
creates a function object out of a pointer to a member
(function template)[edit]
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