First C Program

First C Program

C Programming Tutorial

First C Program

#include < stdio.h>
int main()
{
printf(“\n Hello, JMD Tutorial\n”);
return 0;
}

How to Run C Program

#include < stdio.h>
int main()
{
int a, b,c;

printf(“\n Enter the First value of A=”);

scanf(“%d”, &a);

printf(“\n Ehter the First value of B=”);

scanf(“%d”, &b);

c=a+b;
printf(“\n The sum of A and B is=%d”,c);

return 0;
}

Different parts of C program


 Pre-processor
Header file
Function
Variables
Statements & expressions
Comments

Pre-processor (#include)

In C programming language, #include is the preprocessor. It is also known as a pre-processo. When we try to compile a program, preprocessor commands are first executed and then the program gets compiled.

when we write #include < stdio.h>, it is to inform the compiler to include the stdio.h header file to the program before executing it.

Header file < stdio.h>

A Header file is a collection of built-in functions. A header file is a file with extension .h. Header files contain definitions of the functions which can be incorporated into any C program by using pre-processor #include statement with the header file.

Function main()

Every C program must contain a main() function. Everything inside main() function in a C program will be executed.
int written before the main() function is the return type of main() function

Variables ( int a,b,c)

In c programming , a variable is a container or storage area to hold data.
int a, b,c; in this declaration anc is variable. we will discuss about variable in detail later.

Statements & expressions

An expression statement is a particular kind of statement. It consists of an optional expression followed by a semicolon.

x = 42; // the expression happens to be an assignment

Comments

Comments in C language are used to provide information about lines of code. It is widely used for documenting code. These comments are ignored by the compiler and are not executed. To add a single line comment, start it by adding two forward slashses // followed by the comment. To add multiline comment, enclode it between /* …. */, just like in the program above.

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