zoj 2971 Give Me the Number

//2609243 	2011-07-31 20:05:39 	Accepted 	2971 	C++ 	0 	180 	ylwh!
#include <stdio.h>
#include <string.h>
using namespace std;
char codes[][15]={"zero", "one", "two", "three", "four", "five", "six", "seven", 
				"eight", "nine", "ten", "eleven", "twelve", "thirteen", 
				"fourteen", "fifteen", "sixteen", "seventeen","eighteen", "nineteen",
				"twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty","ninety",
				 "hundred","thousand", "million", "and"};

int getnum(char * s)
{
	int i;
	for(i=0; ; i++)
		if(strcmp( s, codes[i]) == 0)
		{
			return i;
		}
}

int main()
{
	int t, sum, i, j, num, x;
	char s[300], temp[100];
	scanf("%d", &t);
	getchar();      
	while(t--)
	{
		gets(s);    
		j = 0;
		num = 0;
		sum = 0;
		for(i=0; i<=strlen(s); i++)
		{
			if(s[i] != ' ' && s[i] != '\0')
			{
				temp[j++] = s[i];
			}
			else if(s[i] == ' ' || s[i] == '\0')
			{
				temp[j] = '\0';
				x = getnum(temp);
				if(x <= 20)
					num += x;
				else if(x>20 && x<=27)
					num += (x - 18) * 10;
				else if(x == 28)
				{
					num = num * 100;
				}
				else if(x == 30)
				{
					sum += num * 1000000;
					num = 0;
				}
				else if(x == 29)
				{
					sum += num * 1000;
					num = 0;
				}
				j = 0;
			}
		}
		printf("%d\n", sum+num);
	}
return 0;
}