Calculating sum of an integer using recursion

Hello,

In this program, we use a recursive function integerSum() to find the sum of an integer number.
For example: integerSum(5) returns 1 + 2 + 3 + 4 + 5, which is 15.
Here, the argument of integerSum() function is 5, and total is 15.
return 0 is a statement to run once an end condition is met.

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