#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
   将一个字符串的奇数位和偶数位分别抽取出来保存到一个数组
*/
int getoddevent(char* src, char **odd, char **even)//这个需要传递指针的地址作为参数
{
	//需要分配空间
	*even = (char*)malloc(100);
	*odd = (char*)malloc(100);
	if (src == NULL||*odd==NULL||*even==NULL)
	{
		return -1;
	}

	int i = 0;
	int count1 =0;
	int count2 = 0;
	int len = strlen(src);
	//printf("src=%s\n", src);
	char tem1[100];
	char tem2[100];
	for ( i = 0; i < len; i++)
	{
		if (i % 2 == 0){
			tem1[count1] = src[i];
			count1++;
		}
		else
		{
			tem2[count2] = src[i];
			count2++;
		}

	}
	tem1[count1] = 0;
	tem2[count2] = 0;
	//printf("even=%s,odd=%s\n", tem1, tem2);
	strcpy(*even ,tem1);//在进行这一步之前，一定要注意*even必须指向一个合法内存单元
	strcpy(*odd , tem2);
	return 0;
}

int getoddevent2(char* src, char *odd, char *even)//这个需要传递数组作为参数
{
	if (src == NULL || odd == NULL || even == NULL)
	{
		return -1;
	}
	char * tmp1 = odd;
	char *tmp2 = even;
	int i = 0;
	int n1 = 0;
	int n2 = 0;
	
	int len = strlen(src);
	for (i = 0; i < len; i++)
	{
		if (i % 2 == 0)
		{
			*tmp2 = src[i];
			tmp2++;
			n1++;
		}
		else
		{
			*tmp1 = src[i];
			tmp1++;
			n2++;
		}
	}
	//printf("%s,%s\n", tmp1, tmp2);
	 
	even[n1] = 0;
	odd[n2] = 0;
	return 0;
}

int getoddevent3(char* src, char *odd, char *even)//这个需要传递数组作为参数
{
	if (src == NULL || odd == NULL || even == NULL)
	{
		return -1;
	}
	 
	int i = 0;
	 

	int len = strlen(src);
	for (i = 0; i < len; i++)
	{
		if (i % 2 == 0)
		{
			*even = src[i];
			even++;
			 
		}
		else
		{
			*odd = src[i];
			odd++;
			 
		}
	}
	//printf("%s,%s\n", tmp1, tmp2);

	*even = 0;
	*odd = 0;
	return 0;
}

int main(int argc, char const *argv[])
{
	char * p = "a1b2c3d4e5f6";
	char *even;
	char *odd;
	getoddevent(p, &odd, &even);
	printf("even=%s,odd=%s\n", even, odd);
	printf("=================================================\n");
	char even1[50];
	char odd1[50];
	getoddevent3(p, odd1, even1);
	printf("even1=%s,odd1=%s\n", even1, odd1);
	system("pause");
	return 0;
}