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Showing posts with label read. Show all posts
Monday, July 21, 2014
//refer libraries
#include<stdio.h>
#include<conio.h>
void main() //main function definition
{
char c[10];// string variable declaration
clrscr();//to clear the screen it explained in conio.h
printf(“enter your string \n”);
scanf(“%s”,c);
printf(“you are entered string is :%s”,c);
getch();//this function makes to wait a character from standard input or keyboard this function described in conio.h
}
Friday, February 21, 2014
ASSUME CS: CODE, DS: DATA
DATA SEGMENT ; start of data
segment
MSG1 DB 0DH, 0AH,'ENTER YOUR NAME : ', '$'
MSG2 DB 'WHAT IS YOUR NAME? ',
'$'
STR DB
25 DUP(' '), '$' ; 25 bytes of STR array (blank) is declared to store
the user entered name.
X DB 04H ; X coordinate
value
Y DB 12H ; Y
coordinate value
DATA ENDS
DISPLAY MACRO MSG ; DISPLAY macro definition starts
MOV DX, OFFSET MSG
MOV AH, 09H ; display the message whose offset is in
DX using 09H
INT 21H ; with DOS 21H interrupt.
ENDM ; end of macro definition
CODE SEGMENT
START:
MOV AX, DATA ; data segment initialization
MOV DS, AX
DISPLAY MSG1 ; invoke the DISPLAY macro to display
MSG1
MOV SI, OFFSET STR ; SI
point to the 1st memory location of STR array
BACK: MOV AH, 01H ; read a character from keyboard using
01H service
INT 21H ; with 21h interrupt, then compare with
enter key
CMP AL, 0DH ; if yes terminate, otherwise store in
STR array pointed by SI JE
STOP ; if yes terminate,
MOV [SI], AL ; otherwise store in STR array pointed by
SI
INC
SI ; increment SI, to point to the next
location of STR array
JMP BACK ; jump to BACK to
read the next character
STOP: MOV
AH, 07H ; service number
to clear the screen
MOV AL, 00H
; Number of lines to scroll; 00 blank
screen.
MOV BH, 0FH ; attribute of
character; 0F white and 00 black
MOV CX, 00H ; CH=00 Y coordinate of upper left corner
and
; CL=00 X
coordinate of upper right corner.
MOV DH, 31H ; Number of rows;
MOV DL, 79H ; Number of columns;
INT 10H ; BIOS interrupt
to clear the screen is invoked
MOV
AH, 02H ; service number to set the cursor
MOV BH, 00H ; set video Page number to 0
MOV DH, Y ; store row
number in DH (Y coordinate)
MOV
DL, X ; store the
column number (X) in DL register
INT
10H ;
BIOS interrupt to set the cursor is invoked.
DISPLAY MSG2 ; invoke the
DISPLAY macro to display MSG2.
DISPLAY STR ; invoke the
DISPLAY macro to display STR array contents
MOV AH, 4CH ; terminate the program
INT 21H
CODE ENDS ; end of code segment
END
START ; end of program
Output:
D:\MASM>
Masm 7a.asm;
D:\MASM>
Link 7a.obj;
D:\MASM>
TD 7a.exe
Press
F7 to trace the program (line by
line execution).
ASSUME DS: DATA, CS: CODE
MSG1 DB 0AH, 0DH, "ENTER THE FIRST STRING : ","$"
MSG2 DB 0AH, 0DH, "ENTER THE SECOND STRING : ","$"
MSG3 DB 0AH, 0DH, "STRINGS ARE SAME","$"
MSG4 DB 0AH, 0DH, "STRINGS ARE NOT SAME","$"
MSG5 DB 0AH, 0DH, "LENGTH OF FIRST STRING IS: ","$"
MSG6 DB 0AH, 0DH, "LENGTH OF SECOND
STRING IS: ","$"
STR1 DB 100 DUP(' '),"$" ;reserve 100 bytes of blank memory
location for STR1 array
STR2 DB 100 DUP(' '),"$" ;reserve 100 bytes of blank memory
location for STR2 array
LEN1 DB ? ; variable to store the length of 1st
string.
LEN2 DB ? ; variable to store the length of 2nd string.
DATA ENDS
DISPLAY
MACRO MSG ;DISPLAY macro definition starts
here, this macro is used to display
MOV DX, OFFSET MSG ; message, whose
offset address is stored in DX using 09h
MOV AH, 09H ; with 21H DOS
interrupt.
INT 21H
ENDM ; end of macro
definition
DISP
MACRO NUM ;DISP macro definition starts here, this macro
is used to display the length
MOV DL, NUM ; of the string ( character display) using
02H. with DOS 21H interrupt.
MOV AH, 02H
INT 21H
ENDM ; end of macro definition.
CODE SEGMENT ; code
segment starts
START: MOV AX, DATA
MOV DS, AX ; initializing
data segment
MOV
ES, AX
;
initializing extra segment
DISPLAY MSG1 ; invoke DISPLAY
macro to display MSG1
MOV SI, OFFSET STR1 ; SI points to the 1st memory
location of STR1 array
CALL READ
; call READ procedure
to read the 1st string from
keyboard
MOV
LEN1,
BL ;
store
the length of the 1st string in LEN1 variable
DISPLAY MSG2 ; invoke DISPLAY
macro to display MSG2
MOV SI, OFFSET STR2 ; SI points to
the 1st memory location of STR2 array
CALL READ ; call procedure READ to read the1st string from
keyboard
MOV
LEN2,
BL ; store
the length of the 2nd string in LEN2 variable.
MOV
AL, LEN1
CMP
AL, LEN2 ; compare the length of these two strings.
JNE NOTEQUAL ; if not equal go
to label NOTEQUAL
MOV SI, OFFSET STR1 ; SI points to 1st character
of STR1 array (source string)
MOV
DI, OFFSET STR2 ; DI points to 1st character of
STR2 array (destination string).
MOV CL, LEN1 ; store the length of the string in CL ( either
string1 or string2)
CLD ; clear the
direction flag for auto increment mode
REPE CMPSB ; compare the string bytes pointed by SI
and DI
JNE NOTEQUAL ; if strings are
not equal jump to label NOTEQUAL
DISPLAY MSG3 ; otherwise invoke display macro to
display MSG3 (strings are same)
JMP
NEXT ; jump to label
NEXT, to display the length.
NOTEQUAL: DISPLAY
MSG4 ; invoke display macro to display
MSG4 (strings are not same)
NEXT : DISPLAY MSG5
; invoke display macro to display
MSG5.
MOV
AL, LEN1 ; store the
length of 1st string in AL
CALL DISP_LEN
; Call DISP_LEN
procedure to display the length of 1st string.
DISPLAY MSG6 ; invoke
display macro to display MSG6.
MOV
AL, LEN2 ; store the
length of 2nd string in AL.
CALL
DISP_LEN ; Call DISP_LEN
procedure to display the length of 2nd string.
MOV AH,4CH ; terminate the program.
INT
21H
READ PROC NEAR ; start of READ procedure (procedure
defined in the same segment)
MOV BL, 00 ; initially
BL = 00, used as counter to store the number of
characters .
BACK: MOV AH, 01H
INT 21H ; read a character from keyboard, 01h with 21H dos interrupt
CMP AL, 0DH ;
compare with enter key.
JE STOP ; if equal terminate the read process
INC BL ; after reading a character from
keyboard, increment BL by 1
MOV [SI], AL ; store the character in array pointed by SI
INC SI ; increment SI by 1 to point to the
next location of array.
JMP BACK ; jump to BACK to read the next
character
STOP: RET ; return to main
READ ENDP ; end of READ procedure
DISP_LEN PROC NEAR ; start of DISP_LEN procedure
AAM ;convert the 2 digit binary (hex) length in AL
to unpacked BCD
ADD AX, 3030H ;add
AX with 3030H to get the ASCII value of that 2 digit no.
PUSH AX ; store the AX content temporarily in
Stack memory.
DISP AH ; invoke DISP macro to display the
upper digit of the length.
POP AX ; retrieve AX content from stack
DISP AL ; invoke DISP macro to display the lower
digit of the length
RET ;
return to main.
DISP_LEN ENDP ; end of DISP_LEN procedure
CODE ENDS ; end
of code segment
END START ; end of program.
Output:
D:\MASM>
Masm 6a.asm;
D:\MASM>
Link 6a.obj;
D:\MASM>
6a.exe
D:\MASM>
6a.exe
Or
D:\MASM>
TD 6a.exe
Then press F7 to trace the program (line by line execution)
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