OJ Board

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define FALSE	0
#define TRUE	1

void main(void)
{
	char table[10];
	char str_m[200], str_n[200];
	int len_m, len_n;
	int m, n, i, cur_value;

	while ( 1 ) 
	{
		scanf("%s %s", str_m, str_n);

		if ( str_m[0] == '0' && str_n[0] == '0' ) 
			break;

		memset(table, FALSE, sizeof(table));

		len_m = strlen(str_m);
		len_n = strlen(str_n);

		m = str_m[len_m-1] - 48;

		if ( len_n > 1 ) 
		{
			n = ( str_n[len_n-2] - 48 ) * 10 + ( str_n[len_n-1] - 48 );
			
			if ( len_n > 2 ) 
				n++;
		}
		else
			n = str_n[0] - 48;

		cur_value = 1;
		for ( i = 0 ; i < n ; i++ ) 
		{
			cur_value *= m;
			cur_value %= 10;

			if ( table[cur_value] == FALSE ) 
			{
				table[cur_value] = TRUE;
			}
			else
				break;
		}

		if ( i == 0 ) 
			cur_value = 1;
		else if ( i == n ) 
			cur_value = cur_value;
		else
		{
			n--;
			n %= i;
						
			while ( n > 0 ) 
			{
				cur_value *= m;
				cur_value %= 10;
				n--;
			}
		}
		printf("%d\n", cur_value);
	}
}

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 Please help, I need an explination, I realy need an explination, please I need help!!!!!!

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0 238479283749827394234
1 2340982309420394802
2 2
2 5
3 3
3 74
4 982374982739487239847298374982374982734987
5 23849823498
6 2342
7 444444
8 3999949230402394
8 24
9 2345996959645456
2 0
209384032409803948209 4032094809238409238409
8932749872394729346628364 234972983749823749872394789234
0 0

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0
1
4
2
7
7
4
5
6
1
8
4
1
0
1
6

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0
1
4
2
7
9
4
5
6
1
4
6
1
1
9
6

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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>

int main(){
	int num, pow;
	char s1[2000], s2[2000];
	char temp[5];
	int i;
	int sum;
	int cnt;
	int len;
	
	int list[10][5] = {
		1, 0, 0, 0, 0,
		1, 1, 1, 1, 0,
		6, 2, 4, 8, 0,
		1, 3, 9, 7, 0,
		6, 4, 0, 0, 0,
		1, 5, 0, 0, 0,
		1, 6, 0, 0, 0,
		1, 7, 9, 3, 0,
		6, 8, 4, 2, 0,
		1, 9, 0, 0, 0		
	};

	scanf("%s%s", &s1, &s2);
	while ( strcmp(s1, "0") || strcmp(s2, "0")){
		len = strlen(s1);
		num = atoi(&s1[len-1]);
		len = strlen(s2);
		cnt = 0;
		strcpy (temp, "\0");
		if (len > 2){
			for (i=len-2; i<len; i++){
				temp[cnt++] = s2[i];
			}
			temp[cnt] = '\0';
		}
		else {
			strcpy(temp, s2);
		}

		pow = atoi(temp);
		switch(num){
			case 0:
				if (pow != 0)
					sum = 0;
				else {
					sum = 1;
				}
				break;
			case 1:
				sum = 1;
				break;
			case 2: case 3: case 7: case 8:
				if (pow == 0)
					sum = 1;
				else {
					pow = pow % 4;
					sum = list[num][pow];
				}
				break;	
			case 5: case 6:
				if (pow == 0)
					sum = 1;
				else {
					sum = num;
				}
				break;
			case 4: case 9:
				if (pow == 0)
					sum = 1;
				else{
					pow = pow % 2;
					sum = list[num][pow];
				}
				break;
			default: printf("*(#(WUIOJFLSDKFJ\n");
				break;
		}
		printf ("%i\n", sum);
		scanf("%s%s", &s1, &s2);
	}//end while

	
	return 0;
}