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1st year student: Tracing a program by hand

 

1st year student: Tracing a program by hand
BrownianMan

18 Oct, 2009 - 09:58 AM
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Hey, new to the forum.

I'm currently taking my first programming course, and in one of the assignments, I was asked to trace the following Fortran77 program fragment by hand and determine the final values for n and m:

CODE
integer n, m, k, j
n = 0
m = 0
do k = 1, 3
     do j = k, 1, -1
         n = n + j
     end do
     m = m + k
end do
print*, n
print*, m


I was only able to get this far:

n m k j
0 0 1 1
1 1 2 0
3 3 3 2


How should I approach it from here?

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olibenu

RE: 1st Year Student: Tracing A Program By Hand

18 Oct, 2009 - 10:25 AM
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is it cheating if you put breakpoints and run the program?
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olibenu

RE: 1st Year Student: Tracing A Program By Hand

18 Oct, 2009 - 10:32 AM
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start from the inner most loop, that always helps me
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BrownianMan

RE: 1st Year Student: Tracing A Program By Hand

18 Oct, 2009 - 10:43 AM
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QUOTE(olibenu @ 18 Oct, 2009 - 10:32 AM) *

start from the inner most loop, that always helps me


What happens when k becomes higher than 3 though? Shouldn't it exit the loop?
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