Examples for Datatypes

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Example for Primitive Datatypes in C  

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                       intvar.c

/* example for integer variable declaration */

# include <stdio.h>

main()

{

  int num = 100;

  printf("\nValue of num is %d", num);

  getch();

}

In this program,

we have declared a integer variable using the keyword 'int' . int is a primitive datatype

/* */ is a comment line and ignored by the compiler. Comment

lines are used for documenting the program which makes it more readable

* variables are declared in the beginning of the program

* the number of bytes allocated for a int variable is 2 bytes (32 bits) and it varies from compiler to compiler if the OS environment is different like Unix

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Our First C Program

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Here is our first C program

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              welcome.c

#include <stdio.h>

main()

{

   printf("\nWelcome to the world of C");

}

Before getting into minute details of the syntax, there are few points which you have to know about C programming.

* C is a compiler based language which means the whole program is translated into machine code before execution

* C language is case sensitive. This means main() and Main() are not the same

* Every C program must have a function called main()

* main() is a reserved word and cannot be MAIN() or Main()

* main() is a function and it is the first function to be executed in a C program

More about this program

# include ...as of now just note the point that it include the contents of another file at the beginning of the program

main() is a function

{} is a code block which has C syntax

printf() is a library function which displays the output.

There are lot more points to explain, but let me take you through step by step.