**C program for calculating sum of digits in 100!**

#include<stdio.h>

#define MAX 10000

void factorialof(int);

void multiply(int);

int length = 0;

int fact[MAX];

int main(){

int num;

int i,k ;

long int r, sum=0;

printf(“Enter number : “);

scanf(“%d”,&num);

fact[0]=1;

factorialof(num);

for(i=length;i>=0;i–)

{

sum=sum+fact[i];

}

printf(“sum of digits is: %d”, sum );

return 0;

}

void factorialof(int num)

{

int i;

for(i=2;i<=num;i++)

{

multiply(i);

}

}

void multiply(int num)

{

long i,r=0;

int arr[MAX];

for(i=0;i<=length;i++)

{

arr[i]=fact[i];

}

for(i=0;i<=length;i++){

fact[i] = (arr[i]*num + r)%10;

r = (arr[i]*num + r)/10;

}

if(r!=0){

while(r!=0){

fact[i]=r%10;

r= r/10;

i++;

}

}

length = i-1;

}

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