C# Read Text File and Sort in Array It Only Puts One Value Into Listbox

C Linguistic communication Introduction

C is a procedural programming linguistic communication. It was initially developed past Dennis Ritchie in the yr 1972. It was mainly developed as a system programming language to write an operating system. The master features of the C language include depression-level retention access, a simple set of keywords, and a clean style, these features make C language suitable for system programmings like an operating organization or compiler development.
Many after languages have borrowed syntax/features straight or indirectly from the C language. Like syntax of Coffee, PHP, JavaScript, and many other languages are mainly based on the C language. C++ is nearly a superset of C language (Few programs may compile in C, merely non in C++).
Outset with C programming:

1. Structure of a C program
   After the above discussion, nosotros tin can formally assess the structure of a C program. By structure, information technology is meant that any programme can be written in this structure but. Writing a C programme in any other structure will hence lead to a Compilation Fault.
   The structure of a C program is as follows:
   

1. The components of the above construction are:
   1. Header Files Inclusion: The first and foremost component is the inclusion of the Header files in a C programme.
      A header file is a file with extension .h which contains C office declarations and macro definitions to exist shared between several source files.
      Some of C Header files:
      • stddef.h – Defines several useful types and macros.
      • stdint.h – Defines exact width integer types.
      • stdio.h – Defines cadre input and output functions
      • stdlib.h – Defines numeric conversion functions, pseudo-random network generator, memory allocation
      • cord.h – Defines cord handling functions
      • math.h – Defines common mathematical functions
   2. Chief Method Declaration: The adjacent office of a C program is to declare the main() part. The syntax to declare the main function is:
      Syntax to Declare the main method:
      

int main() {}

2. Variable Annunciation: The next office of whatsoever C program is the variable announcement. It refers to the variables that are to be used in the function. Please note that in the C plan, no variable can be used without being declared. Likewise in a C plan, the variables are to be alleged earlier whatever operation in the function.
   Example:
   

int main() {            int a;            . .

2. Body: The body of a function in the C program, refers to the operations that are performed in the functions. It can be annihilation like manipulations, searching, sorting, press, etc.
   Case:
   

int main() {     int a;            printf("%d", a);            . .

2. Return Statement: The terminal part of any C plan is the return statement. The return statement refers to the returning of the values from a office. This return statement and return value depend upon the return blazon of the function. For example, if the render type is void, then there will be no return statement. In any other case, there will be a render statement and the return value will be of the type of the specified return type.
   Example:
   

int main() {     int a;      printf("%d", a);            return 0;            }

2. Writing first program:
   Following is get-go programme in C
   

C

#include <stdio.h>

int main( void )

{

printf ( "GeeksQuiz" );

return 0;

}

1. Let us analyze the program line by line.
   Line 1: [ #include <stdio.h> ] In a C program, all lines that beginning with # are processed past a preprocessor which is a program invoked by the compiler. In a very basic term, the preprocessor takes a C program and produces another C program. The produced program has no lines starting with #, all such lines are processed by the preprocessor. In the above example, the preprocessor copies the preprocessed lawmaking of stdio.h to our file. The .h files are chosen header files in C. These header files generally contain declarations of functions. We need stdio.h for the office printf() used in the program.
   Line ii [ int master(void) ] There must be a starting point from where execution of compiled C program begins. In C, the execution typically begins with the first line of main(). The void written in brackets indicates that the main doesn't take any parameter (Come across this for more details). principal() can be written to take parameters also. We will exist covering that in future posts.
   The int was written earlier main indicates return type of main(). The value returned by master indicates the status of plan termination. See this mail service for more than details on the return type.
   Line three and vi: [ { and } ] In C linguistic communication, a pair of curly brackets ascertain scope and are mainly used in functions and command statements like if, else, loops. All functions must get-go and end with curly brackets.
   Line 4 [ printf("GeeksQuiz"); ] printf() is a standard library function to impress something on standard output. The semicolon at the end of printf indicates line termination. In C, a semicolon is ever used to indicate finish of a argument.
   Line v [ render 0; ] The render statement returns the value from chief(). The returned value may be used by an operating system to know the termination condition of your program. The value 0 typically means successful termination.
   
2. How to execute the to a higher place program:
   In order to execute the to a higher place plan, we need to have a compiler to compile and run our programs. There are certain online compilers like https://ide.geeksforgeeks.org/, http://ideone.com/, or http://codepad.org/ that can be used to start C without installing a compiler.

   Windows: There are many compilers available freely for the compilation of C programs similar Code Blocks and Dev-CPP.   We strongly recommend Code Blocks.
   Linux: For Linux, gcc comes bundled with Linux,  Code Blocks can also be used with Linux.
   

Delight write comments if you find anything incorrect, or you lot want to share more information about the topic discussed in a higher place

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Source: https://www.geeksforgeeks.org/c-language-set-1-introduction/