main.asm

.data
    string: .asciiz "Welcome to Bank Management System\n"

    array: .word 1000, 500
           .word 1001, 900
           .word 1002, 1500
           .word 1003, 5000
           .word 1004, 3000
           .word 1005, 4000

    input1: .asciiz "\nPress 1 for operation \nPress 2 to create account: "

    choice: .asciiz "\nEnter 1 to deposit amount,\n2 to withdraw amount, \n3 for transfer : "
    
    input2: .asciiz "\nEnter account number: "

    input3: .asciiz "\nEnter amount to deposit"

    in

.text

.globl main
.ent main

main:

    #array address in t9
    la $t9, array

    #Displaying Welcome Message
    li $v0, 4
    la $a0, string
    syscall

    #Displaying input1 text
    li $v0, 4
    la $a0, input1
    syscall

    #Taking User Input, if it is 1 or 2
    li $v0, 5
    syscall

    # $t0 = 1 or 2
    move $t0, $v0

    # hardcode $t1 = 2
    addi $t1, $0, 2

    #hardcode $t3 = 3
    addi $t3, $0, 3

    #branch if user input 2 to two
    beq $t0, $t1, two

    #displaying choice message
    li $v0, 4
    la $a0, choice
    syscall

    #taking User input 1, 2, 3
    li $v0, 5
    syscall

    # $t2 = 1 2 OR 3
    move $t2, $v0

    # if choice is 2 then move to two two
    beq $t2, $t1, twotwo

    # if choice is 3 then move to three three
    beq $t2, $t3, threethree

    ##########################################################################

    #user wants to deposit amount

    #Displaying the message to enter account number
    li $v0, 4
    la $a0, input2
    syscall

    #Reading user's account number
    li $v0, 5
    syscall

    #saving account number to $t4
    move $t4, $v0

    #Displaying message to enter amount to deposit
    li $v0, 4
    la $a0, input3
    syscall

    #Reading user's input of amount to deposit
    li $v0, 5
    syscall

    #saving amount to deposit into $t5
    move $t5, $v0

    #setting loop variable t6 to 0
    addi $t6, $0, 0

    #setting $t7 to 5
    addi $t7, $0, 5

    loop1:

        beq $t6, $t7, exit

        #setting column index to 0 which will remain constant
        addi $a2, $0, 0

        #setting row index to loop variable
        addi $a1, $t6, 0

        jal calculate_address 

        #address is in t8
        move $s5, $v0

        lw $t8, ($s5)

        bne $t8, $t4, here

            #loading amount of that account number into s3
            lw $s3, 4($s5)

            #adding amount to deposit to actual amount
            add $s3, $s3, $t5

            #storing back to that address
            sw $s3, 4($s5)

            j exit

    here:    
        #adding 1 in loop variable
        addi $t6, $t6, 1

    j loop1

    exit:


            ######
            lw $s4, 4($s5)
            li $v0,1
            move $a0, $s4
            syscall
            ######

            li $v0,10
            syscall


    #########################################################################


    twotwo:

    threethree:

    two:
        
    
    #Exiting the program
    li $v0, 10
    syscall

    ######################################################################
    # function to calculate address

    calculate_address:

        #column_size = 2
        addi $s6, $0, 2

        #data_size = 4
        addi $s7, $0, 4

        # row index
        move $s0, $a1
        
        # column index
        move $s1, $a2

        # s2 = rowindex * column size
        mul $s2, $s0, $s6

        # s2 = + cloumn index
        add $s2, $s2, $s1

        # s2 = * data_size
        mul $s2, $s2, $s7

        # adding base address
        add $s2, $s2, $t9

        #returning address answer
        move $v0, $s2

        jr $ra 

    .end calculate_address

.end main