无法输出是怎么回事？

[Sasura_321]

//有一个顺序表L，假设元素类型ElemType为整数
//设计一个尽可能高级的算法，将所有奇数移到偶数的前面


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

#define LIST_INIT_SIZE 100
#define LISTINCREMENT 10

typedef int ElemType;
typedef struct
{
ElemType *elem;
int length;
int listsize;
}SqList;

void InitList(SqList &L,int arr[]) //构造一个线性表
{
L.elem = (ElemType*)malloc(LIST_INIT_SIZE*sizeof(ElemType));
int i = 0;
L.length = 0;
for (i = 0; i < 8; i++)
{
L.elem[i] = arr[i];
L.length++;
}
L.listsize = LIST_INIT_SIZE;//初始储存容量
}

void MoveList(SqList &L)
{
int i = 0;
int j = L.length-1;
int temp = 0;

while(i<j)
{
while(i<j && L.elem[i]%2 == 0)
i--;
while(j>i && L.elem[j]%2 == 1)
j++;
if (i < j)
{
temp = L.elem[i];
L.elem[i] = L.elem[j];
L.elem[j] = temp;
}
}
}

void DisList(SqList L) //输出
{
int i = 0;
for(i = 0;i<L.length;i++)
printf("%d", L.elem[i]);
printf("\n");

}
int main()
{
SqList L;
int arr[] = {1,2,3,4,5,6,7,8};
InitList(L,arr);
MoveList(L);
DisList(L);
return 0;
}

[老马何以识途]

问题可能出在InitList上，参数应该是SqList *，而调用处应该是SqList(&L, arr)，这样才能给main函数的L初始化正确的值。

[paschen]

建议单步跟踪程序运行，观察变量变化情况，分析原因

[自信男孩]

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

#define LIST_INIT_SIZE  100
#define LISTINCREMENT   10

typedef int  ElemType;
typedef  struct
{
    ElemType *elem;
    int length;
    int listsize;
}SqList;

void InitList(SqList &L,int arr[], int size)  //构造一个线性表
{
    int i = 0;
    L.elem = (ElemType*)malloc(LIST_INIT_SIZE*sizeof(ElemType));
    L.length = 0;
    for (i = 0; i < size; i++)
    {
        L.elem[i] = arr[i];
        L.length++;
    }
    L.listsize = LIST_INIT_SIZE;//初始储存容量
}

void MoveList(SqList &L)
{
    int i = 0;
    int j = L.length-1;
    int temp = 0;

    while(i<j)
    {
        while(i<j && L.elem[i]%2 == 0)
            i++;    /*从开头向后，需要i++*/
        while(j>i && L.elem[j]%2 == 1)
            j--;    /* 从末尾向前，需要j--*/
        if (i < j)
        {
            temp = L.elem[i];
            L.elem[i] = L.elem[j];
            L.elem[j] = temp;
        }
    }
}

void DisList(SqList L)  //输出
{
    int i = 0;
    for(i = 0;i<L.length;i++)
        printf("%d ", L.elem[i]);
    printf("\n");

}
int main()
{
    SqList L;
    int arr[] = {1,2,3,4,5,6,7,8};
    InitList(L,arr, 8);
    MoveList(L);
    DisList(L);
    return 0;
}

参考一下吧 主要问题是首尾增加的错误；详见代码的注释；