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    <p>You can use <a href="http://spike.scu.edu.au/~barry/interrupts.html#ah0a">function <code>0Ah</code></a> to read buffered input. Given a string buffer in <code>ds:dx</code> it reads a string of up to length 255. The buffer layout is:</p> <pre><code>Byte 0 String length (0-255) Byte 1 Bytes read (0-255, filled by DOS on return) Bytes 2-..Length+2 (The character string including newline as read by DOS). </code></pre> <p>An example of a small COM file that reads a string and then echos it back to the user:</p> <pre><code> org 0x100 start: push cs pop ds ; COM file, ds = cs mov ah, 0x0A ; Function 0Ah Buffered input mov dx, string_buf ; ds:dx points to string buffer int 0x21 movzx si, byte [string_buf+1] ; get number of chars read mov dx, string_buf + 2 ; start of actual string add si, dx ; si points to string + number of chars read mov byte [si], '$' ; Terminate string mov ah, 0x09 ; Function 09h Print character string int 0x21 ; ds:dx points to string ; Exit mov ax, 0x4c00 int 0x21 string_buf: db 255 ; size of buffer in characters db 0 ; filled by DOS with actual size times 255 db 0 ; actual string </code></pre> <p>Note that it will overwrite the input line (and it thus might not look the program is doing anything!)</p> <p>Alternatively you can use <a href="http://spike.scu.edu.au/~barry/interrupts.html#ah01">function <code>01h</code></a> and read the characters yourself in a loop. Something like this (note it will overflow later buffers if more than 255 characters are entered):</p> <pre><code> org 0x100 start: push cs pop ax mov ds, ax mov es, ax; make sure ds = es = cs mov di, string ; es:di points to string cld ; clear direction flag (so stosb incremements rather than decrements) read_loop: mov ah, 0x01 ; Function 01h Read character from stdin with echo int 0x21 cmp al, 0x0D ; character is carriage return? je read_done ; yes? exit the loop stosb ; store the character at es:di and increment di jmp read_loop ; loop again read_done: mov al, '$' stosb ; 'Make sure the string is '$' terminated mov dx, string ; ds:dx points to string mov ah, 0x09 ; Function 09h Print character string int 0x21 ; Exit mov ax, 0x4c00 int 0x21 string: times 255 db 0 ; reserve room for 255 characters </code></pre>
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    1. POHow to make string input in Assembly language?
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    1. POHow to make string input in Assembly language?
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    1. COSo i can make `string db "$"`? Will it works?
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    2. COIf you want a one-byte string containing just the '$' (terminator for the ah=09h function), yes, but then there won't be any place to store the characters you read. `times 255 db` is the same as db 0, 0, 0, 0, [snip 250 times 0,], 0, which ensures there is room to store the characters. If you are using a different assembler the syntax to reserve space might be different (and/or you can use dynamic memory allocation).
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    3. COthank zou verz much.
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