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grandymaker [24]
3 years ago
11

Program 4: But I haven’t taken Calculus yet! OK – we admit, this one might look nasty, but read on because it’s not that bad. On

e of the things that computing folks do A LOT (especially CS students) is analyze how long a program takes to run. In the first step, something might take 1 unit of CPU time. The second step might take 2, the third 3 and so on. Mathematically, that would be expressed by the "summation" operator as this: ∑???? ???? ????=1 This is may look complex, but all it’s saying is that i goes from 1 to n and you sum all those numbers together. So, if (n = 10), ∑???? ???? ????=1 = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55 Fortunately, this reduces to a simple formula. When summing numbers from 1-n, the sum is: (n+1)*n/2 Why? It’s all in how you "pair" the numbers together. In the example above, we could pair (1+10) =11, (2+9)=11, (3+8)=11 and so on. That is, we have n/2 "pairs" of (n+1). Your task is, without using a loop (which we haven’t covered yet), to write a program that asks the user for a number, then prints out the sum of 1 to that number. If you use a loop, you will receive no credit
Computers and Technology
1 answer:
34kurt3 years ago
5 0

Answer:

wdadawdawdawdawdawdawdawsdwfawf

Explanation:

Program 4: But I haven’t taken Calculus yet! OK – we admit, this one might look nasty, but read on because it’s not that bad. One of the things that computing folks do A LOT (especially CS students) is analyze how long a program takes to run. In the first step, something might take 1 unit of CPU time. The second step might take 2, the third 3 and so on. Mathematically, that would be expressed by the "summation" operator as this: ∑???? ???? ????=1 This is may look complex, but all it’s saying is that i goes from 1 to n and you sum all those numbers together. So, if (n = 10), ∑???? ???? ????=1 = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55 Fortunately, this reduces to a simple formula. When summing numbers from 1-n, the sum is: (n+1)*n/2 Why? It’s all in how you "pair" the numbers together. In the example above, we could pair (1+10) =11, (2+9)=11, (3+8)=11 and so on. That is, we have n/2 "pairs" of (n+1). Your task is, without using a loop (which we haven’t covered yet), to write a program that asks the user for a number, then prints out the sum of 1 to that number. If you use a loop, you will receive no credit

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Svetlanka [38]
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3. I’m not 100% sure, but I guess this one is true. As far as I remember, add to selection mode lets you to add new selection to any existing areas. So I think it’s possible to add selection to the existing one.

4. I think this one is also true. But it allows you just paint it, but it’s also kinda modification. Quick Mask allows you to isolate subject and paint selected object. It helps you not to brush subject accidentally. It’s a very useful tool as for me.

5. Yes, this statement is 100% true. But it could be gray for GIMP, because the mask is coded in gray tones, but I think that black is also gray tone. Color black or gray removes part of selection, and color white adds area to existing selection.

6. According to what I’ve mentioned before this one is also true, so there’s no need for additional explanation.

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An information technology professional could be focused on the hardware or software of systems. It is vital that IT professionals deliver services that are foolproof and not susceptible to attacks.

When working with colleagues, they must cooperate in order to deliver the most efficient services.

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IRISSAK [1]

Answer:

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Explanation:

The question says result was declared but not initialized, so using result without initializing it to 0 would throw an error as result would be undefined and you can't add a number to undefined

Another way to do it to keep everything inside the loop would be

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if (i==lo) result= 0;

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}

but this is impractical since it would add unnecesary operations in each cycle of the loop

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