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Following program shows you how to print factorial of given number.
In this program we get input from user and prints factorial of that number using for loop

#include <iostream>

int main() {
    int input;
    std::cout << "Enter a number:";
    std::cin >> input;
    int result = 1;
    for (int i = 1; i <= input; i++)
        result = result * i;
    std::cout << input << " factorial is: " << result;
}

Output:

Enter a number: 7
7 factorial is: 5040



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