Why do we use subi $v1,$a0,0x20 instruction in func1?

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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.data

        msg1: .asciiz "\nEnter a lowercase alphabet character: "

        msg2: .asciiz "\nThe uppercase character is: "

.text

main:

        la $a0,msg1

        li $v0,4

        syscall

 

        li $v0,12

        syscall

        move $a0,$v0

 

        jal func1

 

        la $a0,msg2

        li $v0,4

        syscall

 

        move $a0,$v1

        li $v0,11

        syscall

        j func2

 

func1:

        subi $v1,$a0,0x20

        jr $ra

func2:

        li $v0,10

        syscall

 

Why do we use subi $v1,$a0,0x20 instruction in func1?

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