C Programming

Points to remember While writing a C program

v  Every program requires main () function.

v  The execution of each function in a C program begins at the opening brace and ends are the corresponding closing curly brace.

                     Example

§     void main ()

§  {

§  Program statements;

§  }

v  C programs are written in lowercase.  Upper cases are used in defining Symbolic constants and output strings.

   Example

§  Const int PI = 3.14;

§  Printf(“  Hello Welcome To C Program”);

v  Statements must end in semicolon after main function

   Example

§  main()

§  {

§  Stament 1;

§  Statement 2;

§  }

v  Variables must be Declared for their types before it uses in program.

    Example

§  int age,

§  char name[12];

v  # include preprocessor must used to include header files for special functions.

     Example

§  #include<string.h>         // for the use of String manipulation

§  #include<math.h>          // for the use of formulas

§  These are the special functions strcmp(), Pow() Etc…

v  Braces are balanced when it uses to group multiple statements.

     Example

§  For (i=1;i<=4;i++)

§  {

§  For(j=1;j<=4;j++)

§  {

§  Printf(“hai\t”);

§  }

§  Printf(“\n”);

§  }