Find factorial in c language

Purpose:

Input a number from the keyboard and find the factorial of this number, that is, n!.

Definition of factorial:

The so-called factorial of n means starting from 1 and multiplying it by a number that is 1 larger than the previous number, until it is multiplied to n. The formula is expressed as: 1×2×3 ×4×…×(n-2)×(n-1)×n=n!.

Algorithmic idea:

You can use loops to solve the problem. Let the loop variable be i, the initial value is 1, and i changes from 1 to n; multiply i and sum in turn, and add the product Assign to sum.

Example code:

#include <stdio.h>
int main()
{
    int i,n;
    double sum=1;
    scanf("%d",&n);
    for(i=1;i<=n;i++)
        sum=sum*i;
    printf("%d!=%lf",n,sum);
    printf("\n");
    return 0;
}

Run result:

Input 5, the corresponding factorial output is as follows:

5
5!=120.000000

Recommended tutorial: c language tutorial

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