How to Add a Formula for Excel

Introduction
In an Excel Worksheet, we may import a great deal of data. Sometimes, we need to calculate the data to get another numbers we need. Formula is the mail tool to calculate data.
There are various formulas included in Excel. Actually, formulas are equations and each one starts with an equal sign. We can use a formula to calculate values for a column list. A formula contains four parts: functions, column references, operators and constants.
How to Add Formula for Excel in MS
There are different methods to add a formula for Excel including different part. This example is about formulas containing functions. The example is about how to average all number in the range from A1 to B4.
Firstly, click the cell where we wan to add the formula. Then, click Insert Function on the formula bar. Thirdly, select the function we want to use. We can search the function or browse form the categories. Next, enter the arguments. Click Collapse Dialog to hide the dialog box to enter cell references as an argument. Press Expand Dialog after selecting the cells on the worksheet. Finally, Press Enter when we complete the formula.
How to Add Formula for Excel with Spire.XLS
Spire.XLS presents you an easiest way to add formula for Excel. We will give you a demo with many kinds of formulas written in the worksheet. The formula can be string, bool value, calculation, sheet area reference, time and so on. Here, we reference a variable "currentRow" to control rows of all kinds of formulas. You may add formula text with the property of sheet.Range[++currentRow, 1].Text, and calculate the formula with the property of sheet.Range[currentRow, 2].Formula.
The following code shows how to add a formula for Excel with C#/VB.NET:
[C#]
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01 using Spire.Xls;
02
03 namespace Formula
04 {
05 class Program
06 {
07 static void Main(string[] args)
08 {
09 //Create a new workbook
10 Workbook workbook = new Workbook();
11
12 //Initialize worksheet
13 Worksheet sheet = workbook.Worksheets[0];
14
15 //initialize currentRow
16 int currentRow = 3;
17 string currentFormula = string.Empty;
18
19 //test data
20 sheet.Range[currentRow, 2].NumberValue = 7.3;
21 sheet.Range[currentRow, 3].NumberValue = 5; ;
22 sheet.Range[currentRow, 4].NumberValue = 8.2;
23 sheet.Range[currentRow, 5].NumberValue = 4;
24 sheet.Range[currentRow, 6].NumberValue = 3;
25 sheet.Range[currentRow, 7].NumberValue = 11.3;
26
27 //string.
28 currentFormula = "=\"hello\"";
29 sheet.Range[++currentRow, 1].Text = "=\"hello\"";
30 sheet.Range[currentRow, 2].Formula = currentFormula;
31
32 //bool.
33 currentFormula = "=false";
34 sheet.Range[++currentRow, 1].Text = currentFormula;
35 sheet.Range[currentRow, 2].Formula = currentFormula;
36
37 //calculation
38 currentFormula = "=33*3/4-2+10";
39 sheet.Range[++currentRow, 1].Text = currentFormula;
40 sheet.Range[currentRow, 2].Formula = currentFormula;
41
42 //sheet area reference
43 currentFormula = "=AVERAGE(Sheet1!$D$3:G$3)";
44 sheet.Range[++currentRow, 1].Text = currentFormula;
45 sheet.Range[currentRow, 2].Formula = currentFormula;
46
47 //time
48 currentFormula = "=NOW()";
49 sheet.Range[++currentRow, 1].Text = currentFormula;
50 sheet.Range[currentRow, 2].Formula = currentFormula;
51 sheet.Range[currentRow, 2].Style.NumberFormat = "yyyy-MM-DD";
52
53 //Save the file
54 workbook.SaveToFile("Sample.xls");
55
56 //Launch the file
57 System.Diagnostics.Process.Start("Sample.xls");
58 }
59 }
60 }
[Visual Basic]
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01 Imports Spire.Xls
02
03 Module Module1
04
05 Sub Main()
06 'Create a new workbook
07 Dim workbook As New Workbook()
08
09 'Initialize worksheet
10 Dim sheet As Worksheet = workbook.Worksheets(0)
11
12 'initialize currentRow
13 Dim currentRow As Integer = 3
14 Dim currentFormula As String = String.Empty
15
16 'test data
17 sheet.Range(currentRow, 2).NumberValue = 7.3
18 sheet.Range(currentRow, 3).NumberValue = 5
19
20
21 sheet.Range(currentRow, 4).NumberValue = 8.2
22 sheet.Range(currentRow, 5).NumberValue = 4
23 sheet.Range(currentRow, 6).NumberValue = 3
24 sheet.Range(currentRow, 7).NumberValue = 11.3
25
26 'string.
27 currentFormula = "=""hello"""
28 sheet.Range(System.Threading.Interlocked.Increment(currentRow), 1).Text = "=""hello"""
29 sheet.Range(currentRow, 2).Formula = currentFormula
30
31 'bool.
32 currentFormula = "=false"
33 sheet.Range(System.Threading.Interlocked.Increment(currentRow), 1).Text = currentFormula
34 sheet.Range(currentRow, 2).Formula = currentFormula
35
36 'calculation
37 currentFormula = "=33*3/4-2+10"
38 sheet.Range(System.Threading.Interlocked.Increment(currentRow), 1).Text = currentFormula
39 sheet.Range(currentRow, 2).Formula = currentFormula
40
41 'sheet area reference
42 currentFormula = "=AVERAGE(Sheet1!$D$3:G$3)"
43 sheet.Range(System.Threading.Interlocked.Increment(currentRow), 1).Text = currentFormula
44 sheet.Range(currentRow, 2).Formula = currentFormula
45
46 'time
47 currentFormula = "=NOW()"
48 sheet.Range(System.Threading.Interlocked.Increment(currentRow), 1).Text = currentFormula
49 sheet.Range(currentRow, 2).Formula = currentFormula
50 sheet.Range(currentRow, 2).Style.NumberFormat = "yyyy-MM-DD"
51
52
53 'Save doc file.
54 workbook.SaveToFile("Sample.xls")
55
56 'Launching the MS Word file.
57 System.Diagnostics.Process.Start("Sample.xls")
58
59 End Sub
60 End Module
After running the demo, you will find the formula in the worksheet:
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