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12 March, 20:15

Write a program that lets the user enter a nonnegative integer then uses a loop to calculate the factorial of that number. Display the factorial.

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  1. 12 March, 20:42
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    Following are the program in c+ + language

    #include / / header file

    using namespace std; / / namespace

    int main () / / main function

    {

    int num; / / variable declaration

    long int f=1; / / variable declaration

    do

    {

    cout<<"Enter the Positive value:";

    cin>>num;

    } while (num<0); / / i check whether number is non negative or not

    while (num>0) / / iterating over the loop

    {

    f=f*num; / / calculate the factorial

    num--; / / decrement the value of num by 1

    }

    cout<<" factorial is : "<
    return 0;

    }

    Output:

    Enter the Positive value:7

    factorial is : 5040

    Explanation:

    Following are the description of the program.

    Read the input by user in the "num" variable of "int" type ... The do-while will check the enter number is nonnegative number. While (n>0) loop is calculating the factorial in the "f" variable. Finally display the factorial.
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