Big Data factorial

A headache program; Calculate a factorial of less than 100.

This is my program, which can calculate a factorial of less than 10000:

 1 #include<stdio.h> 2  3 void fac(int val){ 4 int i,n,c; 5         int k; 6         int t[1000]={1}; 7         k=0; 8         for(n=1;val>1;val--){ 9             for(c=0,i=0;i<n;i++){10                 k=t[i]*val+c;11                 t[i]=k%10000;12                 c=k/10000;13             }14             t[i]=c;15             if(t[i]>0)n++;    16         }17         printf("%d",t[--n]);18         for(n--;n>=0;n--)19             printf("%.4d",t[n]);20         printf("\n");    21 }22 int main(){23         int a,n,i;24         scanf("%d",&n);25         for(i=1;i<=n;i++){26             scanf("%d",&a);27             fac(a);28         }29     }

Although the results are correct, I still couldn't do it for a long time by referring to other people's algorithms. I finally breathed a sigh of relief.

It wasn't until I saw this program that my code was a bunch of shit.

Excellent code:

 1 /*Small factorials*/ 2   3 #include<stdio.h> 4   5 void fact(short int); 6 void print(void); 7   8 short int factorial[80]; 9 short int length;10  11 int main()12 {13     short int i,n,t;14     scanf("%d",&t);15     for(i=1;i<=t;i++)16     {17         scanf("%d",&n);18         fact(n);19         print();20     }21     return 0;22 }23  24 void fact(short int n)25 {26     short int i,j,sum,temp;27     for(i=1;i<80;i++)28         factorial[i]=0;29     factorial[0]=1;30     length=1;31     for(i=2;i<=n;i++)32     {33         j=temp=0;34         while(j<length)35         {36             sum=temp+factorial[j]*i;37             factorial[j]=sum%100;38             j++;39             temp=sum/100;40         }41         while(temp>0)42         {43             factorial[j++]=temp%100;44             temp/=100;45             length++;46         }47     }48 }49  50 void print(void)51 {52     short int i;53     printf("%d",factorial[length-1]);54     for(i=length-2;i>=0;i--)55     {56         if(factorial[i]>=10)57             printf("%d",factorial[i]);58         else59             printf("0%d",factorial[i]);60     }61     printf("\n");62 } 

1. In terms of format, the latter is clear, the declaration of the function, the definition of the variable, and the blank line of the empty line. The only thing I do is the indent of the indentation.

2. In variable naming, the latter uses simple but clear English. words should be used, and I am a bunch of I, J, K, L, and C; I can't understand it at all.

3. The above two points directly determine the readability and ease of coding. The latter is an excellent code, and I just learned to draw in kindergarten.

4. In terms of content, the latter's code structure is rigorous, and every variable is taken into account. It flexibly applies functions, global variables, and other simple foundations, with clear thinking. The profile has a standard style. I think it's just a beginner.

5. As a result, the latter strictly follows the requirement of the question. 100 is 100, which indicates its strong memory control capability. I am casual, not strict.

To sum up, my code style and thoughts need to be reshaped.