#include <stdio.h>
#include <stdlib.h>
typedef struct OLNode
{
    int i,j;
    int e;
    struct OLNode *right,*down;
}OLNode,*OLink;
typedef struct
{
    OLink *rhead,*chead;
    int mu,nu,tu;
}CrossList;
void CreatSMatrix_OL(CrossList *M)
{
    int i,j,e;
    int m,n,t;
    OLink p,q;
    printf("请输入M的行数、列数和非零元的个数:\n");
    scanf("%d%d%d",&m,&n,&t);
    M->mu=m,M->nu=n,M->tu=t;
    if(!(M->rhead=(OLink *)malloc((m+1)*sizeof(OLink))))
        exit(0);
    if(!(M->chead=(OLink *)malloc((n+1)*sizeof(OLink))))
        exit(0);
    for(i=1;i<=m;i++)
        M->rhead[i]=NULL;//
    for(j=1;j<=n;j++)
        M->chead[j]=NULL;
    printf("请按任意次序录入非零元的三元组数据,格式(行数 列数 非零元):\n");
    while(t>0)
    {
        scanf("%d%d%d",&i,&j,&e);
            if(!(p=(OLNode *)malloc(sizeof(OLNode))))
                exit(0);
            p->i=i;p->j=j;p->e=e;
            if(M->rhead[i]==NULL||M->rhead[i]->j>j)
            {
                p->right=M->rhead[i];
                M->rhead[i]=p;
            }
            else
            {
                for(q=M->rhead[i];(q->right)&&(q->right->j<j);q=q->right)
                    p->right=q->right;q->right=p;
            }
            if(M->chead[j]==NULL||M->chead[j]->i>i)
            {
                p->down=M->chead[j];
                M->chead[j]=p;
            }
            else
            {
                for(q=M->chead[i];(q->down)&&(q->down->i<i);q=q->down)
                    p->down=q->down;q->down=p;
            }
            t--;
    }
}
void main()
{
    CrossList *M=(CrossList *)malloc(sizeof(CrossList));
    CreatSMatrix_OL(M);

}

比如说像上面那样输入数据就有问题？

我怎么没发现你定义的类？这种问题要用类做，不然写出的程序会不规范。然后写写注释吧，方便别人看。

我用C语言写的啊，只有结构体的概念，没有类的概念...

我找到错误了，谢谢了！
#include <stdio.h>
#include <stdlib.h>
typedef struct OLNode
{
    int i,j;
    int e;
    struct OLNode *right,*down;
}OLNode,*OLink;
typedef struct
{
    OLink *rhead,*chead;
    int mu,nu,tu;
}CrossList;
void CreatSMatrix_OL(CrossList *M)
{
    int i,j,e;
    int m,n,t;
    OLink p,q,pt;
    printf("请输入M的行数、列数和非零元的个数:\n");
    scanf("%d%d%d",&m,&n,&t);
    M->mu=m,M->nu=n,M->tu=t;
    if(!(M->rhead=(OLink *)malloc((m+1)*sizeof(OLink))))
        exit(0);
    if(!(M->chead=(OLink *)malloc((n+1)*sizeof(OLink))))
        exit(0);
    for(i=0;i<=m;i++)///
        M->rhead[i]=NULL;
    for(j=0;j<=n;j++)///
        M->chead[j]=NULL;
    printf("请按任意次序录入非零元的三元组数据,格式(行数(>=1) 列数(>=1) 非零元(!=0)):\n");
    while(t>0)
    {
        scanf("%d%d%d",&i,&j,&e);
            if(!(p=(OLink)malloc(sizeof(OLNode))))
                exit(0);
            p->i=i;p->j=j;p->e=e;
            if(M->rhead[i]==NULL||M->rhead[i]->j>j)
            {
                p->right=M->rhead[i];
                M->rhead[i]=p;
                ////
                printf("M->rhead[%d]->e=%d\n",i,M->rhead[i]->e);
                ////
            }
            else
            {
                for(q=M->rhead[i];(q->right)&&(q->right->j<j);q=q->right);//此处缺了分号
                    p->right=q->right;q->right=p;
                ////
                printf("输出当前横向链表:\n");
                pt=M->rhead[i];
                while(pt!=NULL)
                {
                    printf("%d ",pt->e);
                    pt=pt->right;
                }
                printf("\n");
                ////
            }
            if(M->chead[j]==NULL||M->chead[j]->i>i)
            {
                p->down=M->chead[j];
                M->chead[j]=p;
                ////
                printf("M->chead[%d]->e=%d\n",j,M->chead[j]->e);
                ////
            }
            else
            {
                for(q=M->chead[j];(q->down)&&(q->down->i<i);q=q->down);//此处缺了分号
                    p->down=q->down;q->down=p;
                ////
                printf("输出当前纵向链表:\n");
                pt=M->chead[j];
                while(pt!=NULL)
                {
                    printf("%d ",pt->e);
                    pt=pt->down;
                }
                printf("\n");
                ////
            }
            t--;
    }
}
void main()
{
    CrossList M;
    CreatSMatrix_OL(&M);
}
//现在程序可以正常运行了！