pku1546.cpp

这是ACM 方面的资料 是PKU的 北京大学的出来的

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

char s[8];
int val[8];
int ans;
int B1, B2;

int calc(char c)
{
	if (c >= '0' && c <= '9')
	{
		return c - '0';
	}
	return c - 'A' + 10;
}

void Out(int i)
{
	if (i < 10)
	{
		printf("%d", i);
	}
	else
	{
		printf("%c", 'A' + i - 10);
	}
}

void Solve()
{
	int i, tmp;
	ans = 0;
	i = 0;
	memset(val, 0, sizeof(val));
	while (s[i] != 0)
	{
		ans *= B1;
		tmp = calc(s[i]);
		if (tmp >= B1)
		{
			printf("  ERROR\n");
			return;
		}
		else
		{
			ans += tmp;
		}
		i++;
	}
	tmp = ans;
	for (i = 0; i < 7; i++)
	{
		tmp /= B2;
	}
	if (tmp > 0)
	{
		printf("  ERROR\n");
	}
	else
	{
		tmp = ans;
		for (i = 0; tmp; i++)
		{
			val[i] = tmp % B2;
			tmp /= B2;
		}
		i = 6;
		while (val[i] == 0)
		{
			printf(" ");
			i--;
		}
		for (; i >= 0; i--)
		{
			Out(val[i]);
		}
		printf("\n");
	}
}

int main()
{
	
	while (scanf("%s %d %d", s, &B1, &B2) != -1)
	{
		Solve();
	}

	return 0;
}