Question

Coding Problem 1: In this program, you are asked to write a program in assembly (MIPS) which works as a simple calculator. The program will get two integer numbers, and based on the requested operation, the result should be shown to the user. a. The program should print a meaningful phrase for each input, and the result. i. “Enter the first number” ii. “Enter the second number” iii. “Enter the operation type” iv. “The result is” b. The user should enter 0, 1, and 2 to tell the program the types of operation add, sub, and multiply, respectively. c. How many registers do you need to implement this program? d. What system calls do you need to write this program?

Answer 1

Please up vote ,comment if any query . Thanks for Question . Be safe .

Note : check attached image for output ,code compiled and tested in MARS MIPS simulator .

Also attached image for syscall we need and register we used inside program.

Program Plan :

1. prompt user for first number ,get user input stored in $v0 and move into $t0 (first number)
2. prompt user for second number ,get user input stored in $v0 and move into $t1 (second number)
3. prompt for operation type (0=add,1=sub,2=multiply)
4. operaton type stored in $v0 now check
5. using branch operaton if $v0==0 go to addition label
6. using branch operaton if $v0==1 go to subtract label
7. using branch operaton if $v0==2 go to multiply label
8. else jump to exit label
9. inside addition label store addition in $t2 =$t0+$t1
10. inside subtract label store subtract in $t2 =$t0-$t1
11. inside multiply label store multiply in $t2 =$t0*$t1
12. after them jump to print label
13. inside print label print result string and result of operation by moving $t2 to $a0
14. now exit or terminate program .

Program :

.data
   firstNumber : .asciiz "Enter the first number: "
   secondNumber: .asciiz "Enter the second number: "
   operationType: .asciiz "Enter the operation type(0=add,1=sub,2=multiply ): "
   result : .asciiz "the result is :"
  
  
.text
   main:
  
       la $a0,firstNumber #$a0=address of first number
       li $v0,4 #syscall 4 to print string
       syscall
      
       #read user input integer using syscall 5
       li $v0,5 #user input stored in $v0
       syscall
      
       addi $t0,$v0,0 #move first number in $t0=$v0+0
      
       la $a0,secondNumber #$a0=address of second number
       li $v0,4 #syscall 4 to print string
       syscall
      
       #read user input integer using syscall 5
       li $v0,5 #user input stored in $v0
       syscall
      
       addi $t1,$v0,0 #move second number in $t1=$v0+0
      
      
       la $a0,operationType #$a0=address of operation type
       li $v0,4 #syscall 4
       syscall
      
       #read user input in $v0 using syscall 5
       #0 -> add
       #1 -> subtract
       #2 -> multiply
       li $v0,5 #syscall 5
       syscall
      
      
       beq $v0,0,addition #if operation type $v0==0 go to addition label
       beq $v0,1,subtract #if operation type $v0==1 go to subtract label
       beq $v0,2,multiply #if operation type $v0==2 go to multiply label
       j exit #if invalid value jump to exit label(operation type not 0,1 and 2)

addition: #addition label
   add $t2,$t0,$t1 #t2=$t0+$t1 ,result=firstnumber + secondnumber
   j print #jump to print label
  
subtract: #subtract label
   sub $t2,$t0,$t1 #t2=$t0-$t1 ,result=firstnumber - secondnumber
   j print #jump to print label

multiply: #multiply label
   mul $t2,$t0,$t1 #t2=$t0*$t1 ,result=firstnumber * secondnumber
   j print #jump to print label
  
print: #print label
   la $a0,result #$a0=address of result
   li $v0,4 #syscall 4
   syscall
  
   addi $a0,$t2,0 #move result in $a0 =$t2
   li $v0,1 #syscall 1
   syscall
  
   exit:#exit label
    li $v0,10 #syscall 10 to terminate program
    syscall
      

Output :

Register and syscall used in program :

Please up vote ,comment if any query .