# MIPS Assembly Language Program
#
# High-level (C++) equivalent:
#
# int main()
# {
# 	int age, weight, rate
#
#	cout << "Enter age: ";
#	cin >> age;	// enter age
#	cout << "Enter weight: ";
#	cin >> weight;	// enter weight
#	rate = weight /age;	// compute growth rate
#	cout << "Your growth rate is " << rate << " pounds per year." << endl;
#  }   


	.data
age:	.word	0
weight:	.word	0
inString1:	.asciiz	"Enter age: "	# storage for strings for input / output prompts
inString2:	.asciiz	"Enter weight: "
outString1:	.asciiz	"Your growth rate is "
outString2:	.asciiz	" pounds per year."     

	.text
# __start:			# not used in SPIM simulator
main:			# needed for SPIM simulator!
# print out first prompt, inString1
	li	$v0, 4	# load appropriate system call code into register $v0;
			# code for printing string is 4
	la	$a0, inString1	# load address of string to be printed into $a0
	syscall		# pseudo-code that calls the operating system to perform
			# desired print operation
# read age
	li	$v0, 5	# load system call code into $v0; read integer = 5
	syscall		# pseudo-code that calls the operating system
	sw	$v0, age	# integer read returned in $v0; store into age

# print out second prompt, inString2
	li	$v0, 4	# load system call code into $v0; print string = 4
	la	$a0, inString2	# load address of string to be printed into $a0
	syscall		# call operating system to perform operation

# read weight
	li	$v0, 5	# load system call code into $v0: read integer = 5
	syscall		# pseudo-code that calls the operating system
	sw	$v0, weight	# integer read returned in $v0; store into age

# finally, do some work!
	lw	$t0, age
	lw	$t1, weight
	div	$t1, $t0
	mflo	$t2	# $t2 = weight / age

# print output string outString1
	li	$v0, 4	# load system call code into $v0; print string = 4
	la	$a0, outString1	# load address of string to be printed into $a0
	syscall		# call operating system to perform operation

# print out integer value of rate, contained in $t2
	li	$v0, 1	# load system call code into $v0; print integer = 1
	move	$a0, $t2	# move integer to be printed into $a0:  $a0 = $t2
	syscall		# call operating system to perform operation

# print output string outString2
	li	$v0, 4	# load system call code into $v0; print string = 4
	la	$a0, outString2	# load address of string to be printed into $a0
	syscall		# call operating system to perform operation



#	done		# not used in SPIM simulator!