Question

Write a mips assembly language program that asks the user to enter an alphabetic character (either lower or upper case)and change the case of the character from lower to upper and from upper to lower and display it.

Answer 1

MIPS

  The MIPS, or Microprocessor without Interlocked Pipeline Stages, assembly code was developed by MIPS Computer Systems. There are six major implementations of the code. The two current implementations are MIPS32 and MIPS64, which support 32-bit and 64-bit operating instructions, respectively. MIPS uses a two-character alphanumeric codes to represent different letters and characters such as operands.

Steps for program:

Step 1 :

Open the MIPS code

Step 2 :

Locate the code containing lowercase and vice versa.The numbers are used to represent letters.For example, letters "a" to "i" are represented by numbers from 61 to 69.The letters "j" through "o" are represented by 6A to 6F. The letters "p" through "y" are represented by 70 to 79. The letter z is represented by 7A.

Program :

.data

lower: .ascii "aaaa"

upper: .ascii "xxxx"

.text

loop:

lb $t1, lower($t0)

beq $t1, 0, exit

sub $t1, $t1, 32

sb $t1, lower($t0)

add $t0, $t0, 1

.j loop

lb $t1, upper($t0)

beq $t2, 0, exit

sub $t2, $t2, 32

sb $t2, upper($t0)

add $t0, $t0, 2

.j loop

exit :

lw $t1, lower

sw $t2, upper

li $v0, 10

syscal

Note : Programming in assembly language is easy for memory swapping and memory related purposes.