
Concept explainers
Program Plan:
Following functions are used in the program:
Cout: To display the explanatory text.
Cin: To take input from user.
Following variables are used in the program:
permutation: is used to store the permutation of (n)numbertaken (r)numbers at a time.
n : is used to store the total number of items.
r: is used to store the number that must be taken from total numbers.
num: is a temporary variable used while calculating the factorial of a number.
Summary Introduction:
Program will use the Main () method, which will prompt the user to enter the value for variable n and r and calculate permutation of (n)number taken (r)numbers at a time. Formula to calculate the permutation of (n)number taken (r)numbers at a time is
Program Description:
The purpose of the program is to calculate the permutation of the given number(n) taken (r)numbers at a time.

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Chapter 3 Solutions
Programming and Problem Solving With C++
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