删除字符（指针） 指针遍历 进制转换 中原工学院oj

#include
#include
#include
#include
using namespace std;
int main()
{
	int n,m,tian,du;
	
	while (scanf("%d%d", &n, &m) != EOF)//7 2 7%2=1 7/2=3 3%2=1 1/2=0 1%2=1
	{
		char num[50] = { 0 };
		int i = 0;
		tian = n;
		if (n < 0)
		{
			n = abs(n);
		}
		while (n != 0)
		{
			char du;
			if ((n % m) <= 9)
				du = (n % m) + '0';
			else
			{
				du = (n % m) + 'A' - 10;
			}
			num[i++] = du;
			n /= m;
		}
		if (tian >= 0)
		{
			for (int u = i - 1; u >= 0; u--)
			{
				printf("%c", num[u]);
			}
		}
		else
		{
			printf("-");
			for (int u = i - 1; u >= 0; u--)
				printf("%c", num[u]);
		}
		printf("n");
	}
	return 0;
}

#include
int tiandu(char*tian)
{
	int du = 0;
	while (*tian!= '')
	{
		if (*tian == ' ')
			du--;
			du++;
		tian++;
	}
	return du;
}
int main()
{
	char s[1000];
	char* tian;
	int ing;
	gets(s);
	tian = &s[0];
	ing=tiandu(tian);
	printf("%d", ing);
	return 0;
}

#include
int o(char* tian, char du)
{
	int n = 0;
	char record[1000];
	while (1)
	{
		if (*tian != du)
		{
			record[n] = *tian;
			n++;
		}
		if (*tian == '')
			break;
		tian++;
	}
	int i = 0;
	while (record[i] != '')
	{
		printf("%c", record[i]);
		i++;
	}

	return 0;
}
int main()
{
	char* tian;
	char s[100],du;
	scanf("%s", s);
	scanf(" %c", &du);
	tian = &s[0];
	o(tian, du);

	return 0;
}