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bombyx
Posts: **3**Member

in Algorithms

Hi! I'm James from the Philippines, I'm 17 yrs old, freshman college student taking up computer science. I am actually a beginner in programming. My professor give us an programming assignment in VB 6 about precedence. I'm doing this for almost two weeks now, but then I still cannot change the order of the precedence. I find it hard because instead of MDAS(multiplication,division,addition,and subtraction)order, it is now reverse (addition,subtraction,multiplication,division). I hope someone will help me.

My professor instruct us to use one textbox for the inputs and command button for evaluation...

Assume the following rules of precedence for expressions:

Highest is addition (+)

then subtraction (-)

then multiplication (*)

then division (/)

Evaluate inputs such as:

(a) 1+4*3-2/2 Output: 5*3-2/2 = 5*1/2 = 5/2 = 2.5

(b) 5-2/2+1*2 Output: 5-3/3*2 = 2/3*2 = 4/6 = 0.66667

(c) 3-2+4-2+5 Output: 3-6-7 = -3 - 7 = -10

Output up to 5 decimal places if long.

My professor instruct us to use one textbox for the inputs and command button for evaluation...

Assume the following rules of precedence for expressions:

Highest is addition (+)

then subtraction (-)

then multiplication (*)

then division (/)

Evaluate inputs such as:

(a) 1+4*3-2/2 Output: 5*3-2/2 = 5*1/2 = 5/2 = 2.5

(b) 5-2/2+1*2 Output: 5-3/3*2 = 2/3*2 = 4/6 = 0.66667

(c) 3-2+4-2+5 Output: 3-6-7 = -3 - 7 = -10

Output up to 5 decimal places if long.

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## Comments

6,349Member: student taking up computer science. I am actually a beginner in

: programming. My professor give us an programming assignment in VB 6

: about precedence. I'm doing this for almost two weeks now, but then

: I still cannot change the order of the precedence. I find it hard

: because instead of MDAS(multiplication,division,addition,and

: subtraction)order, it is now reverse

: (addition,subtraction,multiplication,division). I hope someone will

: help me.

:

: My professor instruct us to use one textbox for the inputs and

: command button for evaluation...

:

: Assume the following rules of precedence for expressions:

: Highest is addition (+)

: then subtraction (-)

: then multiplication (*)

: then division (/)

:

: Evaluate inputs such as:

: (a) 1+4*3-2/2 Output: 5*3-2/2 = 5*1/2 = 5/2 = 2.5

: (b) 5-2/2+1*2 Output: 5-3/3*2 = 2/3*2 = 4/6 = 0.66667

: (c) 3-2+4-2+5 Output: 3-6-7 = -3 - 7 = -10

: Output up to 5 decimal places if long.

If none of the calculations hve brackets in them, then the best way to evaluate them is as follows:

1) split the calculation into the numbers and operators.

example: (a) becomes a list of values 1, +, 4, *, 3, -, 2, /, 2

2) loop through that list and calculate each + and replace the 3 elements with the result

example: (a) becomes a list of values 5, *, 3, -, 2, /, 2

3) repeat step 2 until there are no more +-operators

4) Repeat steps 2 and 3 for each operator according to the preference rules

example:

(a) becomes a list of values 5, *, 1, /, 2

(a) becomes a list of values 5, *, 0.5

(a) becomes a list of values 2.5

Once all the operators are calculated, there should only be 1 element left in the list: the final result.

1Member: : student taking up computer science. I am actually a beginner in

: : programming. My professor give us an programming assignment in VB 6

: : about precedence. I'm doing this for almost two weeks now, but then

: : I still cannot change the order of the precedence. I find it hard

: : because instead of MDAS(multiplication,division,addition,and

: : subtraction)order, it is now reverse

: : (addition,subtraction,multiplication,division). I hope someone will

: : help me.

: :

: : My professor instruct us to use one textbox for the inputs and

: : command button for evaluation...

: :

: : Assume the following rules of precedence for expressions:

: : Highest is addition (+)

: : then subtraction (-)

: : then multiplication (*)

: : then division (/)

: :

: : Evaluate inputs such as:

: : (a) 1+4*3-2/2 Output: 5*3-2/2 = 5*1/2 = 5/2 = 2.5

: : (b) 5-2/2+1*2 Output: 5-3/3*2 = 2/3*2 = 4/6 = 0.66667

: : (c) 3-2+4-2+5 Output: 3-6-7 = -3 - 7 = -10

: : Output up to 5 decimal places if long.

:

: If none of the calculations hve brackets in them, then the best way

: to evaluate them is as follows:

: 1) split the calculation into the numbers and operators.

: example: (a) becomes a list of values 1, +, 4, *, 3, -, 2, /, 2

: 2) loop through that list and calculate each + and replace the 3

: elements with the result

: example: (a) becomes a list of values 5, *, 3, -, 2, /, 2

: 3) repeat step 2 until there are no more +-operators

: 4) Repeat steps 2 and 3 for each operator according to the

: preference rules

: example:

: (a) becomes a list of values 5, *, 1, /, 2

: (a) becomes a list of values 5, *, 0.5

: (a) becomes a list of values 2.5

: Once all the operators are calculated, there should only be 1

: element left in the list: the final result.

i think your idea is possible. however, if you have this expression -2+5*4 by splitting the calculation into numbers and operators you will get -7*4 instead of 3*4

6,349Member: : : student taking up computer science. I am actually a beginner in

: : : programming. My professor give us an programming assignment in VB 6

: : : about precedence. I'm doing this for almost two weeks now, but then

: : : I still cannot change the order of the precedence. I find it hard

: : : because instead of MDAS(multiplication,division,addition,and

: : : subtraction)order, it is now reverse

: : : (addition,subtraction,multiplication,division). I hope someone will

: : : help me.

: : :

: : : My professor instruct us to use one textbox for the inputs and

: : : command button for evaluation...

: : :

: : : Assume the following rules of precedence for expressions:

: : : Highest is addition (+)

: : : then subtraction (-)

: : : then multiplication (*)

: : : then division (/)

: : :

: : : Evaluate inputs such as:

: : : (a) 1+4*3-2/2 Output: 5*3-2/2 = 5*1/2 = 5/2 = 2.5

: : : (b) 5-2/2+1*2 Output: 5-3/3*2 = 2/3*2 = 4/6 = 0.66667

: : : (c) 3-2+4-2+5 Output: 3-6-7 = -3 - 7 = -10

: : : Output up to 5 decimal places if long.

: :

: : If none of the calculations hve brackets in them, then the best way

: : to evaluate them is as follows:

: : 1) split the calculation into the numbers and operators.

: : example: (a) becomes a list of values 1, +, 4, *, 3, -, 2, /, 2

: : 2) loop through that list and calculate each + and replace the 3

: : elements with the result

: : example: (a) becomes a list of values 5, *, 3, -, 2, /, 2

: : 3) repeat step 2 until there are no more +-operators

: : 4) Repeat steps 2 and 3 for each operator according to the

: : preference rules

: : example:

: : (a) becomes a list of values 5, *, 1, /, 2

: : (a) becomes a list of values 5, *, 0.5

: : (a) becomes a list of values 2.5

: : Once all the operators are calculated, there should only be 1

: : element left in the list: the final result.

:

: i think your idea is possible. however, if you have this expression

: -2+5*4 by splitting the calculation into numbers and operators you

: will get -7*4 instead of 3*4

:

:

With a minor adjustment (-number is split into + (-number)) this can be rectified. His example of 3-6-7 then becomes: 3, +, -6, +, -7.