Screen related function

1)      textcolor() :- textcolor() is an inbuilt function that reside into conio.h and it is responsible to change colour of text (i.e foreground) by specified colour.

Syntax :- To call textcolor()

                                         textcolor(constant/symbolic constant);

For example:-

                                         textcolor(4);

                                             or

                                         textcolor(RED);

NOTE:- An argument passed to inbuilt function textcolor must be constant or symbolic constant(i.e RED).

2)      textbackground() :- textbackground() is an inbuilt function that also reside into conio.h and it is responsible to change background color of text by specified colour.

Syntax :-  To call textbackground()

                                         textbackground(constant/symbolic constant);

For example:-

                                         textbackground(RED);

                                                        or

                                         textbackground(4);

3)      cprintf() :- cprintf() is an  inbuilt function i.e responsible to display parenthesized statements or monitor and effective its colour according to inbuilt function textcolor() and textbackground().

Syntax :-  To call cprintf()

                                         cprintf(“statement”);

For example:-

Explanation (1)

void main()

{

clrscr();

textcolor(4);

textbackground(2);

cprintf(“ welcome to C”);

printf(“\nIt is a demo”);

getch():

}

Output------ welcome to C

                      It is a demo

Explanation (2):-

void main()

{

clrscr();

textbackground(2);

textcolor(4);

cprintf(“ welcome to C”);

textcolor(5);

cprintf(“\nIt is a demo”);

getch():

}

Output------ welcome to C

                                         It is a demo

Explanation (3):-

void main()

{

clrscr();

textbackground(2);

textcolor(4);

cprintf(“ welcome to C”);

textcolor(1);

cprintf(“\n \rIt is a demo”);

getch():

}

Output------ welcome to C

                       It is a demo

Explanation (4):-

void main()

{

clrscr();

textbackground(BLUE);

textcolor(RED);

cprintf(“ welcome to C”);

getch():

}

Output------ Error:-   Undefined symbol ‘BLUE’

                                         Undefined symbol ‘RED’

NOTE:-  To resolve this problem a header file conio.h must be included into file manually.

Explanation (5):-

#include<conio.h>

void main()

{

clrscr();

textbackground(2);

textcolor(4);

cprintf(“ welcome to C”);

getch():

}

Output------ welcome to C

Symbolic constant       Constant     Background           Foreground

BLACK                                                   0                              YES                                         YES

BLUE                                                      1                              YES                                         YES

GREEN                                                  2                              YES                                         YES

CYAN                                                     3                              YES                                         YES

RED                                                        4                              YES                                         YES

MAGENTA                                          5                              YES                                         YES

BROWN                                                6                              YES                                         YES

LIGHT GREY                                        7                              YES                                         YES

DARK GREY                                         8                              NO                                         YES        

LIGHT BLUE                                         9                              NO                                         YES

LIGHT GREEN                                     10                           NO                                         YES

LIGHT CYAN                                        11                           NO                                         YES

LIGHT RED                                           12                           NO                                         YES

LIGHT MAGENTA                             13                           NO                                         YES

YELLOW                                                14                           NO                                         YES

WHITE                                                   15                           NO                                         YES        

BLINK                                                    128                         NO                                         ***