How to summarize a formula field in crystal reports? - crystal-reports

Question

How do I add a running total or summary field on a formula field in crystal reports?
// Sample Report
Serial No. Premium Commission Net (Premium-Commission)
-----------------------------------------------------------------------------
1. 10 4 6
2. 40 30 10
---------------------------------------------------------------------------
Grand Total 50 34 16
In sample report, Net (Premium-Commission) is a formula field which gets evaluated for each row? How do I add a grand total/summary field for my formula? It seems we can add a summary field to only Command fields.

Answer 1

Suppose Net (Premium-Commission) formula field name is {#Net}. Now you have to create another three formula fields.
Initializer: this formula filed will be placed in header section to reset all variables.
Increment: this formula field will be placed in detail section to summarize the value.
Total: this formula field will be placed in footer section to show total of {#Net}.
Code will be writen in formula fields as below.
{#Initializer}
WhilePrintingRecords;
Numbervar dSum :=0;
{#Increment}
WhilePrintingRecords;
Numbervar dSum; //Don't initialize zero
dSum:=dSum+{#Net}; //{#Net} formula field must be return numeric value
{#Total}
WhilePrintingRecords;
Numbervar dSum; //Don't initialize zero
dSum;
Place all formula fields in their appropriate section and suppress {#Initializer} and {#Increment} formula field.

Answer 2

If you are using any calculation then that is not possible but one workaround would be to sum the each row and reset it in header.
Create a formula #Intialize in that write below code:
Shared NumberVar count;
count:=0
In detail write below formula and place it after Net (Premium-Commission).
Shared NumberVar count;
Count:=count+<>
\
3. Now create one more formula #Display and place it in footer.
Shared NumberVar count;
count;