How “Hello, World!” program works?
- The
#include
is a preprocessor command that tells the compiler to include the contents ofstdio.h
(standard input and output) file in the program. - The
stdio.h
file contains functions such asscanf()
andprintf()
to take input and display output respectively. - If you use the
printf()
function without writing#include <stdio.h>
, the program will not compile. - The execution of a C program starts from the
main()
function. printf()
is a library function to send formatted output to the screen. In this program,printf()
displays Hello, World! text on the screen.- The
return 0;
statement is the “Exit status” of the program. In simple terms, the program ends with this statement.
#include <stdio.h> int main() { // printf() displays the string inside quotation. printf("Hello World!"); return 0; }
Output
Hello World
What is C language is used for?
C language is used to develop system applications that forms major portion of operating systems such as Windows, UNIX and Linux. Operating systems, C compiler and all UNIX application programs are written in C language.
For most people, C++ is the better choice. It has more features, more applications, and for most people, learning C++ is easier. C is still relevant, and learning to program in C can improve how you program in C++. Neither language is a bad choice, and both have realistic career applications.
C. C is a general-purpose language that most programmers learn before moving on to more complex languages. … It is easy to learn because: A simple syntax with only 32 keywords.
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