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Arithmetic_Operations.txt

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+%macro write_string 2
+    mov	ebx, 1	    ;file descriptor (stdout)
+    mov	eax, 4	    ;system call number (sys_write);tell linker entry 
+    mov	ecx, %1     ;message to write
+    mov	edx, %2     ;message length
+    int	0x80        ;call kernel
+%endmacro
+
+%macro accept 2
+    mov ebx,0
+    mov eax,3
+    mov ecx,%1
+    mov edx,%2
+    int	0x80        ;call kernel
+%endmacro
+
+;======================================================================================;
+section	.text
+	global _start       ;must be declared for using gcc
+_start:                     ;tell linker entry point
+     ; display title
+    write_string msg,len
+    write_string newline, len8
+    write_string msg1, len1
+    accept num1,1
+    write_string num1,1
+    write_string newline, len8
+    write_string msg2, len2
+    accept num2,1
+    write_string num2,1
+    write_string newline, len8
+    write_string newline, len8
+
+    mov al, byte[num1]
+    sub al,'0'
+    mov bl, byte[num2]
+    sub bl,'0'
+    add al,bl
+    add al,'0'
+    mov byte[ans],al
+
+
+; print addition
+    write_string add_msg,len3
+    write_string ans,1
+    write_string newline,len8
+
+    mov al, byte[num1]
+    sub al,'0'
+    mov bl, byte[num2]
+    sub bl,'0'
+    sub al,bl
+    add al,'0'
+    mov byte[ans],al
+
+; print subtraction
+    write_string sub_msg,len4
+    write_string ans,1
+    write_string newline,len8
+
+    mov al, byte[num1]
+    sub al,'0'
+    mov bl, byte[num2]
+    sub bl,'0'
+    mul bl
+    add al,'0'
+    mov byte[ans],al
+
+; print multiplication
+    write_string mul_msg,len5
+    write_string ans,1
+    write_string newline,len8
+
+; calculate division	
+    mov al, byte[num1]
+    sub al,'0'
+    mov bl, byte[num2]
+    sub bl,'0'
+    div bl
+    add al,'0'
+    add ah,'0'
+    mov byte[ans],al
+    mov byte[rem],ah
+
+; print division
+    write_string div_msg,len6
+    write_string ans,1
+    write_string newline,len8
+
+; print remainder
+   write_string rem_msg,len7
+   write_string rem,1
+   write_string newline,len8
+
+; end program
+   mov eax,1
+   mov ebx,0
+   int	0x80        ;call kernel
+
+;========================================================================================;
+section	.data
+msg     db  'ARITHMETIC OPERATIONS', 0xa
+len     equ  $ - msg
+msg1	db  'Enter first number: '	
+len1	equ  $ - msg1			
+msg2	db  'Enter second number: '
+len2	equ  $ - msg2		
+add_msg	db  'Addition is: '	    
+len3	equ  $ - add_msg		
+sub_msg	db  'Subtraction is: '	   
+len4	equ  $ - sub_msg			
+mul_msg	db  'Multiplication is: '	
+len5	equ  $ - mul_msg		
+div_msg	db  'Division is: ' 	
+len6	equ  $ - div_msg		
+rem_msg db  'Remainder is: '
+len7    equ  $ - rem_msg
+newline db  " ", 0xa
+len8    equ  $ - newline
+num1 db '0'
+num2 db '0'
+
+;======================================================================================;
+section .bss
+ans: resb 2
+rem: resb 1
+;======================================================================================;

Find_Substring.txt

@@ -0,0 +1,88 @@
+;MACROS DEFINITION ==========================================================================
+%macro write_string 2
+    mov	ebx, 1	    ;file descriptor (stdout)
+	mov	eax, 4	    ;system call number (sys_write);tell linker entry 
+	mov	ecx, %1     ;message to write
+	mov	edx, %2     ;message length
+	int	0x80        ;call kernel
+%endmacro
+
+%macro accept 2
+    mov ebx,0
+    mov eax,3
+	mov ecx,%1
+	mov edx,%2
+	int	0x80        ;call kernel
+%endmacro
+;==============================================================================================;
+
+section	.text
+	global _start       			;must be declared for using gcc
+_start:                     			;tell linker entry point
+    	write_string msg1, len1
+    	write_string string_inp,string_len
+    	write_string newline, newl_len
+    	write_string msg2, len2
+    	accept st_ind,1
+    	write_string st_ind,1
+    	write_string newline, newl_len
+    	write_string msg3, len3
+    	accept en_ind,1
+    	write_string en_ind,1
+    	write_string newline, newl_len
+    	write_string msg4,len4
+
+	mov esi, string_inp
+	mov byte[len_temp],string_len
+	add byte[len_temp], 30h
+rpt:	mov ch, [esi]
+        mov bl, byte[st_ind]
+ 	cmp bl, byte[counter]
+ 	jg nextchar
+ 	mov bl, byte[en_ind]
+ 	cmp byte[counter], bl
+ 	jg nextchar
+
+	mov al, byte[esi]
+	mov byte[print_temp], al
+	write_string print_temp,1
+
+nextchar: inc esi
+          inc byte[counter]
+          dec byte[len_temp]
+          cmp byte[len_temp],'0'
+          jg rpt
+
+
+
+myend:				; end program
+	    mov	eax, 1	    	;system call number (sys_exit)
+	    mov ebx, 0
+	    int	0x80        	;call kernel
+;==========================================================================================;
+
+section	.data
+
+msg1	db	'Input string is : '	
+len1	equ	$ -msg1
+msg2    db  	'Enter start index: '
+len2    equ 	$ -msg2
+msg3    db  	'Enter end index: '
+len3    equ 	$ -msg3
+msg4    db  	'Substring is: '
+len4    equ 	$ -msg4
+newline db 	" ",0xa
+newl_len equ 	$ -newline
+counter db 	'0'
+string_inp db 	"GoodMorning"
+string_len 	equ $ -string_inp
+print_temp db 	'0'
+len_temp db 	'0'
+
+;=============================================================================================;
+
+section .bss
+
+st_ind: resb 1
+en_ind: resb 1
+;==============================================================================================;