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<blockquote data-quote="lek" data-source="post: 4233141" data-attributes="member: 133071">Need to write a Assembly language program in nasm to solve the below problem...I wrote 1 but i cannot get the correct output.<img src="/styles/default/xenforo/smilies/default/no.gif"&nbsp; class="smilie" loading="lazy" alt=":no:" title="No&nbsp; &nbsp; :no:" data-shortname=":no:" />.If some one knows Assembly language pls help meeee.....<img src="/styles/default/xenforo/smilies/default/sad.gif"&nbsp; class="smilie" loading="lazy" alt=":(" title="Sad&nbsp; &nbsp; :(" data-shortname=":(" />Problem:Write an assembly language program that allows entry of a&nbsp; decimal number via the keyboard. Note that the number should be accumulated as a bit word in&nbsp; register eax. The program terminates when a space is entered.solution:section .dataaccum&nbsp; &nbsp; dd&nbsp; &nbsp; 0&nbsp; &nbsp; &nbsp; &nbsp; ;This is a double word (32 bits)msg&nbsp; &nbsp;&nbsp; db&nbsp; &nbsp; &nbsp; 'Please enter a Decimal number: 'len&nbsp; &nbsp;&nbsp; equ&nbsp; &nbsp;&nbsp; $ - msg&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; ;length of stringbuf&nbsp; &nbsp; dd&nbsp; &nbsp; 0x0d0a30&nbsp; &nbsp; &nbsp; &nbsp; ;the input buffersection .text&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; ;program section&nbsp; &nbsp; &nbsp; &nbsp; global _start&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; ;must be declared for linker (ld)_start:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; ;tell linker entry point&nbsp; &nbsp; rawmodemy_loop:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;notice that loop is a reserve name&nbsp; &nbsp; ; Write banner&nbsp; &nbsp; &nbsp; &nbsp; mov&nbsp; &nbsp;&nbsp; edx,len&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; ;message length&nbsp; &nbsp; &nbsp; &nbsp; mov&nbsp; &nbsp;&nbsp; ecx,msg&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; ;message to write&nbsp; &nbsp; &nbsp; &nbsp; mov&nbsp; &nbsp;&nbsp; ebx,1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; ;file descriptor (stdout)&nbsp; &nbsp; &nbsp; &nbsp; mov&nbsp; &nbsp;&nbsp; eax,4&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; ;system call number (sys_write)&nbsp; &nbsp; &nbsp; &nbsp; int&nbsp; &nbsp;&nbsp; 0x80&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;call kernel&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ; Read a digit&nbsp; &nbsp; &nbsp; &nbsp; mov&nbsp; &nbsp;&nbsp; edx,len&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;message length&nbsp; &nbsp; &nbsp; &nbsp; mov&nbsp; &nbsp;&nbsp; ecx,buf&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;message to read&nbsp; &nbsp; &nbsp; &nbsp; mov&nbsp; &nbsp;&nbsp; ebx,0&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;file descriptor (stdin)&nbsp; &nbsp; &nbsp; &nbsp; mov&nbsp; &nbsp;&nbsp; eax,3&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;system call number (sys_read)&nbsp; &nbsp; &nbsp; &nbsp; int&nbsp; &nbsp;&nbsp; 0x80&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;call kernel&nbsp; &nbsp; mov&nbsp; &nbsp; eax,[buf]&nbsp; &nbsp; &nbsp; &nbsp; and&nbsp; &nbsp; ax,7fh&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;Strip off the most significant bit&nbsp; &nbsp; &nbsp; &nbsp; cmp&nbsp; &nbsp; ax,0x20&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;Compare with space&nbsp; &nbsp; &nbsp; &nbsp; je&nbsp; &nbsp; exit&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;Jump to exit if space&nbsp; &nbsp; &nbsp; &nbsp; sub&nbsp; &nbsp; ax, '0'&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; ; Subtract away the ASCII value for '0'&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; mov&nbsp; &nbsp;&nbsp; edx,15&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; ;message length&nbsp; &nbsp; &nbsp; &nbsp; mov&nbsp; &nbsp;&nbsp; [buf],ax&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;message to write&nbsp; &nbsp; &nbsp; &nbsp; mov&nbsp; &nbsp;&nbsp; ebx,1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; ;file descriptor (stdout)&nbsp; &nbsp; &nbsp; &nbsp; mov&nbsp; &nbsp;&nbsp; eax,4&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; ;system call number (sys_write)&nbsp; &nbsp; &nbsp; &nbsp; int&nbsp; &nbsp;&nbsp; 0x80&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;call kernel&nbsp; &nbsp; &nbsp; &nbsp; xor&nbsp; &nbsp; eax,eax&nbsp; &nbsp; &nbsp; &nbsp; jmp&nbsp; &nbsp; my_loop&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;jump to my_start if sum less twentyexit:&nbsp; &nbsp; normalmode&nbsp; &nbsp; &nbsp; &nbsp; mov&nbsp; &nbsp;&nbsp; eax,1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;system call number (sys_exit)&nbsp; &nbsp; &nbsp; &nbsp; int&nbsp; &nbsp;&nbsp; 0x80&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;call kernel</blockquote>

[QUOTE="lek, post: 4233141, member: 133071"] Need to write a Assembly language program in nasm to solve the below problem...I wrote 1 but i cannot get the correct output.:no:.If some one knows Assembly language pls help meeee.....:( [B]Problem: Write an assembly language program that allows entry of a decimal number via the keyboard. Note that the number should be accumulated as a bit word in register [/B][B]eax. The program terminates when a space is entered.[/B] [B]solution:[/B] section .data accum dd 0 ;This is a double word (32 bits) msg db 'Please enter a Decimal number: ' len equ $ - msg ;length of string buf dd 0x0d0a30 ;the input buffer section .text ;program section global _start ;must be declared for linker (ld) _start: ;tell linker entry point rawmode my_loop: ;notice that loop is a reserve name ; Write banner mov edx,len ;message length mov ecx,msg ;message to write mov ebx,1 ;file descriptor (stdout) mov eax,4 ;system call number (sys_write) int 0x80 ;call kernel ; Read a digit mov edx,len ;message length mov ecx,buf ;message to read mov ebx,0 ;file descriptor (stdin) mov eax,3 ;system call number (sys_read) int 0x80 ;call kernel mov eax,[buf] and ax,7fh ;Strip off the most significant bit cmp ax,0x20 ;Compare with space je exit ;Jump to exit if space sub ax, '0' ; Subtract away the ASCII value for '0' mov edx,15 ;message length mov [buf],ax ;message to write mov ebx,1 ;file descriptor (stdout) mov eax,4 ;system call number (sys_write) int 0x80 ;call kernel xor eax,eax jmp my_loop ;jump to my_start if sum less twenty exit: normalmode mov eax,1 ;system call number (sys_exit) int 0x80 ;call kernel [/QUOTE]

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