How convert two separate objects from separate arrays into one string?

Question

string[] groups;
int groupCount;
double[] grades;
int gradeCount;

So the groups and grades are in two separate arrays and I need to combine them as one string and add them to a new array.

string[] test = new string[groupCount];
for (int i = 0; i < groupCount; i++)
{
   test[i] = ("{0}:   {1}", groups[i], Math.Round(grades[i],2));              
   Console.WriteLine("{0}", test[i]);
}

How do i do it ?

Yeah it throws a lot of errors ; It expects ";" so it would be declared propperly; also : Error 1 Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement — Tom
– Tom, Commented Oct 11, 2016 at 11:16

Dmitrii Bychenko · Accepted Answer · 2016-10-11 14:10:55Z

3

C# 6.0 string interpolation (please, notice $ before the string):

test[i] = $"{groups[i]}:   {Math.Round(grades[i],2)}";

Another possibility is Linq (in order to output the entire collection in one go):

string[] groups;
double[] grades;

...

var test = groups
  .Zip(grades, (group, grade) => $"{group}:    {Math.Round(grade, 2)}")
  .ToArray(); // array materialization (if you want just to output you don't need it)

Console.Write(String.Join(Environemnt.NewLine, test));

edited Oct 11, 2016 at 14:10

answered Oct 11, 2016 at 11:26

Dmitrii Bychenko

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1 Comment

uTeisT Over a year ago

Got my vote for interpolation. I always prefer answers with more up-to-date solutions. For more info, one can refer to: stackoverflow.com/documentation/c%23/24/c-sharp-6-0-features/49/…

Berkay Yaylacı · Accepted Answer · 2016-10-11 11:15:42Z

2

You forgot string.Format()

It should be,

string.Format("{0}:   {1}", groups[i], Math.Round(grades[i], 2));

Hope helps,

answered Oct 11, 2016 at 11:15

Berkay Yaylacı

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1 Comment

Tom Over a year ago

OMG ! Lifesaver :D Thank you very much ! !!

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