Question

Hi

Can you solve this question for me in MIPS language works on mars4.5:

Write a program that asks the user to enter a letter (between A and Z) and display the letter corresponding index in the alphapet (e.g, if user enters A, display 1).

Answer 1

MIPS PROGRAM :-

.data
message: .asciiz "Please, enter a letter (between A and Z): \n"
result:   .asciiz "Index of the alphabet is :"

.text
main:

   # show the message
   li $v0, 4
   la $a0, message
   syscall

# reads a character and the user input is stored in $t1
li $v0, 12
syscall
   add $t1, $zero, $v0
  
  
   #ascii code of 'A'
   li $t0, 0x41
  
   #subtracting the ASCII of the character with ASCII code of 'A'
   #it gives the offset index value with referring 'A' as 0
   sub $t3, $t1, $t0
  
   #as we need to start from indexing 'A' as 1; we add value 1 to it
   addi $t3 $t3, 1
  
show:
# prints out the message
li $v0, 4
la $a0, result
syscall

# prints out the result
li $v0, 1
add $a0, $zero, $t3
syscall

# end of the main function
li $v0, 10
syscall