Determine if a string contains all lowercase letters

Assignment Help C/C++ Programming

Reference no: EM132604403

Problem Set

Question 1. Each of these problems gives "before" conditions and an instruction. Give the indicated "after" state.

	Before	Instruction executed	After
(a)	EBX: FF008E BA	notebx	EBX

(b)	AX: 8E BA	or ax, 0EDF2h	AX
				SF __	ZF__

(c)	AX: 8E BA	xor ax, 0EDF2h	AX
				SF __	ZF__

(d)	AX: 8E BA	and ax, 0EDF2h	AX
				SF __	ZF__
(d)	AX: 8E BA	testax, 80h	AX
				SF __	ZF__
(e)	AX: 8E BA	shl ax, 4	AX
				CF__

(f)	AX: 8E BA	sar ax, 4	AX
				CF__

Question 2. Suppose that value is an unsigned integer in the EAX register. Give instructions to compute(value mod 64), putting the result in the EBX register and leaving EAX unchanged.

Question 3. Starting with the PROC directive and ending with the ENP directive, write an 80x86 procedure that implements the function described by the following C++ function header:
voidarrMix(int arr1[], int arr2[], int arr3[], int count);
// for i=0, 1,...,count-1bits 0-7 and 16-23 of arr3[i] come
// from arr1[i] and bits 8-15 and 24-31 come from arr2[i]
Follow 32-bit cdeclprotocol.

Question 4. Each of these problems gives "before" conditions and one or more instructions. Give the indicated "after" state.

	Before	Instruction(s) executed	After
(a)	string1 BYTE "ABCD" string2 BYTE "GHIJ"	cld lea esi, string1 lea edi, string2 mov ecx, 3 rep movsb	ESI
	string1 BYTE "ABCD" string2 BYTE "GHIJ"
	(string1 is at address 00406030 and string2 is at address 00406034)		EDI

			string1

			string2

(b)	string1 BYTE "BLUE" string2 BYTE "BEAN"	cld lea esi, string1 lea edi, string2 mov ecx, 4 repecmpsb	ECX
	string1 BYTE "BLUE" string2 BYTE "BEAN"
	(string1 is at address 00406030 and string2 is at address 00406034)		ESI

			EDI
			ZF ___

(c)	string BYTE "CSCI" (string is at address 00406030)	cld lea edi, string mov al, 'S' mov ecx, 4 repnescasb	ECX

			EDI

			ZF ___

(d)	source: string at address 004BD000: green dest: string at address 004BD005: crown	lea esi,source lea edi,dest cld movsb	ESI

			EDI
			string at dest: _____________

Question 6. Suppose you want to determine if a string contains all lowercase letters. For this purpose you are going to write a procedure allLower. A C++ header for this procedure might look like

int allLower(char str[]);
// precondition: str is a null terminated string
// postcondition:
// returns true (-1) if str contains only lowercase letters
// returns false (0) if str contains any other character

Using32-bit cdeclprotocol, write assembly language code to implement hasLower.

Reference no: EM132604403

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