Question

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import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int result = 0;
        System.out.print("Enter the first number: ");
        int x = input.nextInt();
        System.out.print("Enter the second number: ");
        int y = input.nextInt();
        System.out.println("operation type for + = 0");
        System.out.println("operation type for - = 1");
        System.out.println("operation type for * = 2");
        System.out.print("Enter the operation type: ");
        int z = input.nextInt();
        if(z==0){
           result = x + y;
           System.out.println("The result is " + result);
        }else if(z==1){
            result = x - y;
            System.out.println("The result is " + result);
        }else if(z==2){
            result = x * y;
            System.out.println("The result is " + result);
        }else{
            System.out.println("Wrong input");
        }

    }
}

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Change Java program to MIPS

How many registers do you need to implement this program?

What system calls do you need to write this program?

Answer 1

Program:

.data
stmt1: .asciiz "Enter the first number: "
stmt2: .asciiz "Enter the second number: "
stmt3: .asciiz "\nEnter the operation type: "
stmt4: .asciiz "operation type for + = 0"
stmt5: .asciiz "\noperation type for - = 1"
stmt6: .asciiz "\noperation type for * = 2"
stmt7: .asciiz "Enter the operation type: "
stmt8: .asciiz "\nThe result is "
stmt9: .asciiz "\nWrong input"
newline: .asciiz "\n"
.text
.globl main
main:
        la $a0, stmt1       # load address of stmt for syscall
        li $v0, 4           # specify Print String service
        syscall
        
        li $v0,5       #get user input for first number
        syscall
        move $t0,$v0
        
        la $a0, stmt2       # load address of stmt for syscall
        li $v0, 4           # specify Print String service
        syscall
        
        li $v0,5       #get user input for second number
        syscall
        move $t1,$v0
        
        la $a0, stmt4       # load address of stmt for syscall
        li $v0, 4           # specify Print String service
        syscall
        
        la $a0, stmt5       # load address of stmt for syscall
        li $v0, 4           # specify Print String service
        syscall
        
        la $a0, stmt6       # load address of stmt for syscall
        li $v0, 4           # specify Print String service
        syscall
        
        la $a0, stmt3       # load address of stmt for syscall
        li $v0, 4           # specify Print String service
        syscall
        
        li $v0,5       #get user input for operation type
        syscall
        move $t2,$v0
        
        beqz $t2,sum
        beq $t2,1,difference
        beq $t2,2,product
        
        la $a0, stmt9       # load address of stmt for syscall
        li $v0, 4           # specify Print String service
        syscall
        
        j end
sum: add $t3,$t0,$t1
     j printResult
difference: sub $t3,$t0,$t1
            j printResult
product:    mul $t3,$t0,$t1
            j printResult  
printResult:    la $a0, stmt8       # load address of stmt for syscall
                li $v0, 4           # specify Print String service
                syscall
                
                move $a0,$t3
                li $v0,1
                syscall    
                j end
end:   li $v0,10
       syscall

Output:

I used 6 registers to implement the program

$a0, $v0 for input and output operations

$t0 for storing first number

$t1 for storing second number

$t2 for storing operation

$t3 for storing result

system calls needed:

4 to print string

5 to read integer

1 to print output