#include <stdio.h>
#include <malloc.h>
#define    MAXV 100
#define INF 32767
typedef int InfoType;                /*最大顶点个数*/
/*以下定义邻接矩阵类型*/
typedef struct
{      int no;                        /*顶点编号*/
    InfoType info;                /*顶点其他信息*/
} VertexType;                    /*顶点类型*/
typedef struct                  /*图的定义*/
{      int edges[MAXV][MAXV];         /*邻接矩阵*/
       int vexnum,arcnum;           /*顶点数，弧数*/
    VertexType vexs[MAXV];        /*存放顶点信息*/
} MGraph;                        /*图的邻接矩阵类型*/
/*以下定义邻接表类型*/
typedef struct ANode               /*弧的结点结构类型*/
{    int adjvex;                  /*该弧的终点位置*/
       struct ANode *nextarc;         /*指向下一条弧的指针*/
       InfoType info;               /*该弧的相关信息,这里用于存放权值*/
} ArcNode;
typedef int Vertex;
typedef struct Vnode              /*邻接表头结点的类型*/
{    Vertex data;                /*顶点信息*/
    ArcNode *firstarc;             /*指向第一条弧*/
} VNode;
typedef VNode AdjList[MAXV];    /*AdjList是邻接表类型*/
typedef struct
{    AdjList adjlist;             /*邻接表*/
    int n,e;                     /*图中顶点数n和边数e*/
} ALGraph;                       /*图的邻接表类型*/

void MatToList(MGraph g,ALGraph *&G)//这里也报错。。。
{    int i,j,n=g.vexnum;                    /*n为顶点数*/
    ArcNode *p;
    G=(ALGraph *)malloc(sizeof(ALGraph));
    for (i=0;i<n;i++)                    /*给邻接表中所有头结点的指针域置初值*/
        G->adjlist[i].firstarc=NULL;
    for (i=0;i<n;i++)                    /*检查邻接矩阵中每个元素*/
        for (j=n-1;j>=0;j--)
            if (g.edges[i][j]!=0)                /*邻接矩阵的当前元素不为0*/
            {
                   p=(ArcNode *)malloc(sizeof(ArcNode));    /*创建一个结点*p*/
                p->adjvex=j;
                p->info=g.edges[i][j];
                p->nextarc=G->adjlist[i].firstarc;        /*将*p链到链表后*/
                G->adjlist[i].firstarc=p;
            }
    G->n=n;G->e=g.arcnum;
}
void ListToMat(ALGraph *G,MGraph &g)////////就是这里报错。
{    int i,j,n=G->n;
    ArcNode *p;
    for (i=0;i<n;i++)          /*g.edges[i][j]赋初值0*/
           for (j=0;j<n;j++)
            g.edges[i][j]=0;
    for (i=0;i<n;i++)
    {
        p=G->adjlist[i].firstarc;
        while (p!=NULL)
        {
            g.edges[i][p->adjvex]=p->info;
            p=p->nextarc;
        }
    }
    g.vexnum=n;g.arcnum=G->e;
}
void DispMat(MGraph g)
/*输出邻接矩阵g*/
{    int i,j;
    for (i=0;i<g.vexnum;i++)
    {
        for (j=0;j<g.vexnum;j++)
            if (g.edges[i][j]==INF)
                printf("%3s","∞");
            else
                printf("%3d",g.edges[i][j]);
        printf("\n");
    }
}
void DispAdj(ALGraph *G)
{    int i;
    ArcNode *p;
    for (i=0;i<G->n;i++)
    {
        p=G->adjlist[i].firstarc;
        if (p!=NULL) printf("%3d: ",i);
        while (p!=NULL)
        {
            printf("%3d",p->adjvex);
            p=p->nextarc;
        }
        printf("\n");
    }
}

int main()
{    int i,j;
    MGraph g,g1;
    ALGraph *G;
    int A[MAXV][6]={    {0,5,0,7,0,0},{0,0,4,0,0,0},{8,0,0,0,0,9},{0,0,5,0,0,6},    {0,0,0,5,0,0},
                    {3,0,0,0,1,0}};
    g.vexnum=6;g.arcnum=10;
    for (i=0;i<g.vexnum;i++)        /*建立如图的邻接矩阵*/
        for (j=0;j<g.vexnum;j++)
            g.edges[i][j]=A[i][j];
    printf("\n");
    printf(" 有向图G的邻接矩阵:\n");
    DispMat(g);
    G=(ALGraph *)malloc(sizeof(ALGraph));
    printf(" 图G的邻接矩阵转换成邻接表:\n");
    MatToList(g,G);
    DispAdj(G);
    printf(" 图G的邻接表转换成邻接邻阵:\n");
    ListToMat(G,g1);
    DispMat(g1);
    printf("\n");
    return 0;
}
\g\main.c|33|error: expected ';', ',' or ')' before '&' token|
\g\main.c|51|error: expected ';', ',' or ')' before '&' token|

把文件后缀名改成.cpp

c语言没有引用

是的，谢谢，哥们你是什么专业呀？

Code Blocks严格区别c和c++，c中没有引用类型~