i have to write a function to calculate the total income from a csv file but I have no idea how to complete it
totalIncome:
#finds the total income from the file
#arguments: a0 contains the file record pointer array location (0x10040000 in our example) But your code MUST handle any address value
# a1:the number of records in the file
#return value a0:the total income (add up all the record incomes)
#if empty file, return 0 for a0
bnez a1, totalIncome_fileNotEmpty
li a0, 0
ret
totalIncome_fileNotEmpty:
# Start your coding from here!
li a0, 0
#if no student code entered, a0 just returns 0 always :(
# End your coding here!
ret
this is my code:
int arraysum(int a[], int size) {
int ret = 0;
int i;
for (i = 0;i < size;i++) {
ret = ret + a[i];
}
return ret;
}
.section .text
.global arraysum
arraysum:
# a0 = int a[]
# a1 = int size
# t0 = ret
# t1 = i
addi t0, zero, 0 # ret = 0
addi t1, zero, 0 # i = 0
1: # For loop
bge t1, a1, 1f # if i >= size, break
slli t2, t1, 2 # Multiply i by 4 (1 << 2 = 4)
add t2, a0, t2 # Update memory address
lw t2, 0(t2) # Dereference address to get integer
add t0, t0, t2 # Add integer value to ret
addi t1, t1, 1 # Increment the iterator
jal zero, 1b # Jump back to start of loop (1 backwards)
1:
addi a0, t0, 0 # Move t0 (ret) into a0
jalr zero, 0(ra)
can someone help me to check if this is right? and did i miss something?
