Unsigned additiong overflow
Hi,
I need some help on completing my little project I'm doing to enhance my skills a little bit. My program is to read in an amount transaction and add the amounts together. If the amount added together exceeds the nth bit, then an overflow occurs. Below is my code for what I've done so far:
Code:
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.data # Data declaration section
Head: .ascii "\n\tThis program"
.ascii " can be used to balance your check book."
.asciiz "\n\n\t\t\t\t\t\t\t\t\t Balance"
tabs: .asciiz "\t\t\t\t\t\t\t\t\t"
tran: .asciiz "\nTransaction:"
error: .asciiz "Overflow Occurred – Last Transaction Ignored" #### Overflow message
bye: .asciiz "\n **** Adios Amigo **** "
.text # Executable code follows
main:
li $v0, 4 # system call code for print_string
la $a0, Head # load address of Header message into $a0
syscall # print the Header
move $s0, $zero # Set Bank Balance to zero
loop:
li $v0, 4 # system call code for print_string
la $a0, tran # load address of prompt into $a0
syscall # print the prompt message
li $v0, 5 # system call code for read_integer
syscall # reads the amount of Transaction into $v0
beqz $v0, done # If $v0 equals zero, branch to done
addu $s0, $s0, $v0 # add transaction amount to the Balance
li $v0, 4 # system call code for print_string
la $a0, tabs # load address of tabs into $a0
syscall # used to space over to the Balance column
li $v0, 1 # system call code for print_integer
move $a0, $s0 # move Bank Balance value to $a0
syscall # print Bank Balance
b loop # branch to loop
done: li $v0, 4 # system call code for print_string
la $a0, bye # load address of msg. into $a0
syscall # print the string
li $v0, 10 # terminate program run and
syscall # return control to system
# END OF PROGRAM
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