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64 lines
1.7 KiB
64 lines
1.7 KiB
.globl main |
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.text |
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main: |
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# print user input |
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li $v0, 4 |
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la $a0, enter_num |
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syscall |
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# get input from user and set argument |
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li $v0, 5 |
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syscall |
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move $a1, $v0 |
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la $a0, arr # $a0 based address of array |
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#li $a1, 1 # $a1 number to be found (checked) - change the value (7) to test |
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li $a2, 6 # $a2 max array index to be checked - change the value (3) to test |
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li $s0, 0 # set counter to 0 |
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jal lookup # hop to lookup function |
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# print out result |
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li $v0, 1 # print_int syscall code = 1 |
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move $a0, $s0 # load integer into $ao |
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syscall |
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# print newline |
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li $v0, 4 |
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la $a0, newline |
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syscall |
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# exit |
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li $v0, 10 |
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syscall |
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lookup: |
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addi $t0, $a2, 1 # store one higher value |
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# loop to find index |
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bne $s0, $t0, dsetoob # set out of bounds if we overrun array |
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li $s0, -1 # index is oob, set to -1 |
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jr $ra # jump back to ra in main |
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dsetoob: # label for if we dont want to set oob |
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# find current array value |
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addi $t1, $s0, 0 # load index into $t1 |
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sll $t1, $t1, 2 # multiply the offset |
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add $t1, $t1, $a0 # add the offset to the base address |
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lw $t2, 0($t1) # get current array value: aka arr[$s0] |
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bne $a1, $t2, dontjump # check if this is the value we are looking for |
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jr $ra # return to main function if the values match |
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dontjump: # continue loop if they match |
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addi $s0, $s0, 1 # incriment counter |
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j lookup # back to beginning of loop |
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.data |
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arr: .word 5, 2, 1, 4, 6, 3 # change array to test |
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enter_num: .asciiz "Enter number to be found: " |
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newline: .asciiz "\n" |
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str_found: .asciiz "found" |
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str_not_found: .asciiz "not_found"
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