# Create some null terminated strings to use .data strPromptFirst: .asciiz "Enter an integer value n:" strResult: .asciiz "Sum is: " strCR: .asciiz " " .text .globl main main: # STEP 1 -- get the first operand # Print a prompt asking user for input li $v0, 4 # syscall number 4 will print string whose address is in $a0 la $a0, strPromptFirst # "load address" of the string syscall # actually print the string

# Now read in the first operand li $v0, 5 # syscall number 5 will read an int syscall # actually read the int move $s0, $v0 # save result in $s0 for later

# STEP 2 Call the function to calculate the sum move $a0, $s0 # move the input integer n to register $a0 jal sum # jump to the function sum to calculate the sum move $s1, $v0 # move the final sum value to register $s1

# STEP 3 -- print the sum # First print the string prelude li $v0, 4 # syscall number 4 -- print string la $a0, strResult syscall # actually print the string # Then print the actual sum li $v0, 1 # syscall number 1 -- print int move $a0, $s1 # put the result in $a0 for print syscall # actually print the int

# STEP 4 -- # Finally print a carriage return li $v0, 4 # syscall for print string la $a0, strCR # address of string with a carriage return syscall # actually print the string

# STEP 5 -- exit li $v0, 10 # Syscall number 10 is to terminate the program syscall # exit now sum: # write your code here and final result must be stored in register $v0.

jr $ra

Problem 1: (10 Marks) Write a MIPS assembly program to print the sum of the first n numbers. Ask n as an input from the user, and print out the sum 1 +2 + ... + (n-1) + n. Use the code in the file Problem1.asm provided with this document