Question

1.) Use Visual Studio to create a program written in MASM assembly language. 2.) Declare a 4-byte unsigned integer variable named: number 3.) Initialize it a value of 5. 4.) Display the value. Here is the number: 5 Press any key to continue MASM HW #1b Output a one byte signed integer 1.) Change the variable number (in HW 1a) to a 1-byte unsigned integer 2.) Remember that the operands must be the same size. To move a 1-byte value to the eax, which is 4 bytes won't work. The 1-byte value must be moved to the al register (1 byte). 3.) Now that the value is in the al register, the Writelnt procedure can be used to output the value. Problem: The Writelnt procedure outputs the value as a 32-bit number, and although the al register has the correct value, 5, the rest of the eax has 1's and 0's. So the output will not be correct. Ex: EAX register: 01001100000111010011010100000101 (These 3 bytes of the eax have random 1's and 0's) (The al register holds a 5) Solution: First move 0 to the eax, which puts 32 0's in the eax. EAX register: 00000000000000000000000000000000 Then move number, 5, to the al. 00000000000000000000000000000101 4.) Display the number as done in HW 1a.

          1.) Use Visual Studio to create a program written in MASM assembly language.
2.) Declare a 4-byte unsigned integer variable named: number
3.) Initialize it a value of 5.
4.) Display the value.
Here is the number: 5
Press any key to continue
MASM HW #1b  Output a one byte signed integer
1.) Change the variable number (in HW 1a) to a 1-byte unsigned integer
2.) Remember that the operands must be the same size. To move a 1-byte value to the eax, which
is 4 bytes won't work. The 1-byte value must be moved to the al register (1 byte).
3.) Now that the value is in the al register, the Writelnt procedure can be used to output the value.
Problem: The Writelnt procedure outputs the value as a 32-bit number, and although the al
register has the correct value, 5, the rest of the eax has 1's and 0's. So the output will not be correct.
Ex: EAX register: 01001100000111010011010100000101
(These 3 bytes of the eax
have random 1's and 0's)
(The al register holds a 5)
Solution: First move 0 to the eax, which puts 32 0's in the eax.
EAX register: 00000000000000000000000000000000
Then move number, 5, to the al.
00000000000000000000000000000101
4.) Display the number as done in HW 1a.

1.) Use Visual Studio to create a program written in MASM assembly language.
2.) Declare a 4-byte unsigned integer variable named: number
3.) Initialize it a value of 5.
4.) Display the value.
Here is the number: 5
Press any key to continue
MASM HW #1b Output a one byte signed integer
1.) Change the variable number (in HW 1a) to a 1-byte unsigned integer
2.) Remember that the operands must be the same size. To move a 1-byte value to the eax, which
is 4 bytes won't work. The 1-byte value must be moved to the al register (1 byte).
3.) Now that the value is in the al register, the Writelnt procedure can be used to output the value.
Problem: The Writelnt procedure outputs the value as a 32-bit number, and although the al
register has the correct value, 5, the rest of the eax has 1's and 0's. So the output will not be correct.
Ex: EAX register: 01001100000111010011010100000101
(These 3 bytes of the eax
have random 1's and 0's)
(The al register holds a 5)
Solution: First move 0 to the eax, which puts 32 0's in the eax.
EAX register: 00000000000000000000000000000000
Then move number, 5, to the al.
00000000000000000000000000000101
4.) Display the number as done in HW 1a.

Added by Laura J.

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