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C Language Tutorial with Free C Programs

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What is C : - C Programming Tutorial

The C programming language is a widely used programming language for creating computer programs. This powerful computer programming language was developed in 1972 by Dennis Ritchie at the Bell Telephone Laboratories. C programming is used basically for System programming.

C language is a middle level language. It is a structured language. C language is a case sensitive language. All syntax written in c language is in lower case. C is the basis for C++. The statements, commands used in C are also available in C++. Thus learning C is a first step towards learning C++which is quite similar to c with some additional features.

This is simple Hello World Program in C language:

#include <stdio.h>
 
int main(void)
{
    printf("hello, world\n");
    return 0;
}

There is always a main() function in a c program.

A function has the form:

type name_function (parameters)
{
 local variables
 
 C Statements
 
 }
 

The printf function is a function used to print the output to the screen.

Note:#include<stdio.h> =this is a header file used in c. This line starts with a #, and is called a preprocessor directive. The preprocessor directive reads our program before it is complied and only executes those lines beginning with a # symbol. The word inside the angular brackets <> is a header file name, which is required to do the work of Input / Output. The contents of stdio.h header file are included at the place where the #include statement appears. The statement inside the function are terminated with a semicolon , the preprocessor directives should not end with a semicolon because preprocessors are messages to the compiler.

Another Simple C program:

main() {
int no;
puts("Please enter a no.: ");
scanf("%d", &no);
printf("The number is %d",no);
}
 

*****************************************************************************************************************

scanf function : This lets us input from the keyboard and for that input is to be taken by the program and processed.

printf function: It is a function used to print the output to the screen.

%d=integer %f=float %c=char %s =s tring %e=inputs number in scientific notation