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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