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a3d61ac
Close Lab-1
weitsai Aug 1, 2014
d1a7073
Fix error and warning to fibseq
weitsai Aug 1, 2014
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10 changes: 10 additions & 0 deletions lab-1/fib.s
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Original file line number Diff line number Diff line change
Expand Up @@ -15,18 +15,28 @@ fibonacci:

@ R4 = R0 - 0 (update flags)
@ if(R0 <= 0) goto .L3 (which returns 0)
subs r4, r0, #0
ble .L3

@ Compare R4 wtih 1
@ If R4 == 1 goto .L4 (which returns 1)
cmp r4, #1
beq .L4

@ R0 = R4 - 1
@ Recursive call to fibonacci with R4 - 1 as parameter
subs r0, r4, #1
bl fibonacci

@ R5 = R0
@ R0 = R4 - 2
@ Recursive call to fibonacci with R4 - 2 as parameter
mov r5, r0
subs r0, r4, #2
bl fibonacci

@ R0 = R5 + R0 (update flags)
adds r0, r5, r0

pop {r3, r4, r5, pc} @EPILOG

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10 changes: 7 additions & 3 deletions lab-1/fibseq.c
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Expand Up @@ -8,8 +8,12 @@ int main(int argc, char **argv)
int result=0;

printf("Please input a number:");
scanf("%d",&number);
result = fibonacci(number);
printf("The fibonacci sequence at %d is: %d\n", number, result);

if (scanf("%d",&number) == 1) {
result = fibonacci(number);
printf("The fibonacci sequence at %d is: %d\n", number, result);
}

return 0;
}