immediate help with c# required

#1 » Post by **Wilcox** » 21 Mar 2016 18:51

im 1st grade yet in university, studying IT & computer engineering, they are teaching us C# and it's my first time doing this shit since I decided to be lazy and skip all the classes over the course of 6 weeks

this is my exam question(according to 2nd grades), please take it very serious

i need to create the increment symbol using the "for loop", the program that finds the total value when you add up numbers from a to b

for example, the total of numbers from 1 to 10 is 55, i know that because im an expert at maths but I got no clue how to make this happen with C#

wtb immediate help, i have about 14 hours left until the exam

#2 » Post by **belendor** » 21 Mar 2016 19:16

Code: Select all

using System;

namespace Loops

{

   class Program

   {

      int number=0;

      static void Main(string[] args)

      {

         for (int i = 1; i <= 5; i++)

         {

            number= number + i;

         }

      }

   }

}

change the 5 to the number u want to count up to, you can also make this a var and fill in a number u like, it's been a while since i did c# lol

#3 » Post by **Wilcox** » 21 Mar 2016 19:19

i don't have any studios installed currently, did you test this and does it work? for example when you write 1 and 50 does it say 1275

im gonna look at this shit from my phone during the exam xd

#4 » Post by **belendor** » 21 Mar 2016 19:29

using System.IO;
using System;

class Program
{
static void Main()
{
int number=0;
Console.WriteLine("Hello, World!");
for (int i = 1; i <= 5; i++)
{
number= number + i;
Console.WriteLine(number);
}
}
}

copy paste it in
http://www.tutorialspoint.com/compile_csharp_online.php

#5 » Post by **Gnurg** » 21 Mar 2016 19:44

I highly doubt you would get the same question the year after, so in those 14 hours, I would rather get to know the basic of each topic you have had over the course thus far to be prepared for most of it. And just one question about a loop seems awfully easy for an exam?

#6 » Post by **Matsy** » 21 Mar 2016 19:50

Still dont understand what your asking for lol, a loop to add up a string of numbers? an array of numbers? numbers you type in and get an answer back?
Maybe I'm just stupid....

#7 » Post by **jamhead** » 21 Mar 2016 19:58

Here's a nice commented version if you need to understand what's happening in Belendor's answer:

Code: Select all


using System.IO;

using System;



class Program

{

    static void Main()

    {

        

        // start out by declaring variables a and b

        // "finds the total value when you add up numbers from a to b"

        int a = 1;

        int b = 50;

        

        // Make another variable to keep track of the total each time

        int total=0;

        

        // Make a for loop that starts at "a" and goes up to be "b", incrementing by one each time

        // "create the increment symbol using the "for loop""

        for (int i = a; i <= b; i++)

        {

            

            // add the value of each i to our running total

            total = total + i;

            

            // write to the console the total after each loop

            Console.WriteLine(number);

        }

        

        

        

        

    }

}

Slight improvement: explicitly making a and b variables since the question states that.

#8 » Post by **Polkic** » 21 Mar 2016 20:00

He needs program that adds numbers from 1 to 10 ( 1+2+3+4+5+6+7+8+9+10).

#9 » Post by **Longi** » 21 Mar 2016 20:01

he wants to make " program " to counting a set of numbers ... the set of numbers starts with " A " and ends with " B "

so lets say ... program will say

- Write first number
- you will write 5
- program wil ask for second number
- you will write 15
- press enter or random key ..for example

and program will do 5+6+7+8+9+10+11+12+13+14+15

- your number is 110

end

#10 » Post by **Gnurg** » 21 Mar 2016 20:02

Matsy wrote:Still dont understand what your asking for lol, a loop to add up a string of numbers? an array of numbers?
Maybe I'm just stupid....

I think he wants a loop that adds the numbers from number a to number b. So in his example a was 1 and b 10.

Code: Select all

static int addNumbersFromAToB(int a, int b) {

   int sum = 0;

   

   while (a <= b) { // (a < b) if you do not want to include number b.

      sum += a++;

   }



   return sum;

}

#11 » Post by **Matsy** » 21 Mar 2016 20:05

Yes but how does he get the values? does he enter them? are they already in a string or array? whut
If its just an array he can use this as a adding mechanism

Code: Select all

int sum = arr.Sum();

Console.WriteLine(sum);

Unless it has to be a loop for some god awful reason (if its an array)..
If it has to be just use

Code: Select all

for (int i = 0; i < arr.Length; i++)

{

    sum += arr[i];

}

Or the one you provided will work aswell, but its purely decided on how the numbers from a to b are assigned.

#12 » Post by **Longi** » 21 Mar 2016 20:08

j=0; for(i='a',i<='b',i++){j=j+i}
printf(j)

mby somthing like this

i rly dont know it was loooong time ago i had this in school

#13 » Post by **Gnurg** » 21 Mar 2016 20:12

Matsy wrote:Yes but how does he get the values? does he enter them? are they already in a string or array? whut

It's likely a paper exam and he is to create a function similiar to the one I wrote. I doubt an examiner is interrested in c# i/o syntax.

#14 » Post by **belendor** » 21 Mar 2016 20:22

bitches pls, come program COBOL with me.

#15 » Post by **Gnurg** » 21 Mar 2016 20:26

belendor wrote:bitches pls, come program COBOL with me.

Scheme is more fun with all those god damn parentheses. >..............<

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