Something wrong with different IDE xcode and vs - c

Question

I am using both Xcode and VS2017.But the code below works fine in Xcode,and get right output.But in vs, when using the function Printlist(),it stop working and run into loop:
Please input the number of vertexes:
5
Please input the number of edges:
6
Please input each vertex's imformation:
A
B
C
D
E
Please input the relationship between two vertexes:
A B
A D
B C
C D
B E
C E
The Adjacency Matrix you've entered is:
0 1 0 1 0
1 0 1 0 1
0 1 0 1 1
1 0 1 0 0
0 1 1 0 0
The converted adjacency list is:
(0)A->3 1
(1)B->4 2 0
(2)->4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4................
The program is to create an adjacency matrix and convert it to list. I am searching for a long time on net. But no use. Please help or try to give some ideas how to achieve this.
Thanks in advance:)
#include <stdio.h>
#include <stdlib.h>
#define vexnum 20
#define isLetter(a) ((((a)>='a')&&((a)<='z')) || (((a)>='A')&&((a)<='Z')))
int visited[vexnum];
typedef struct {
char vexs[vexnum];
int AdjMatrix[vexnum][vexnum];
int n, e; //VEXNUM and EDGENUM
}MGraph;
typedef struct ArcNode
{
int adjvex;
struct ArcNode *nextarc;
}ArcNode;
typedef struct VNode
{
char data;
ArcNode *firstarc;
}VNode, AdjList[vexnum];
int GetPosition(MGraph G, char ch)
{
int i;
for (i = 0; i<G.n; i++)
{
if (G.vexs[i] == ch)
return i;
}
return -1;
}
void CreatMGraph(MGraph *G, int n, int e)
{
int i, j, k;
int p = 0, q = 0;
char a, b;
printf("Please input each vertex's imformation:\n");
for (i = 0; i<n; i++)
{
do
{
G->vexs[i] = getchar();
} while (!isLetter(G->vexs[i]));
}
for (i = 0; i<n; i++)
{
for (j = 0; j<n; j++)
{
G->AdjMatrix[i][j] = 0;
}
}
printf("Please input the relationship between two vertexes:\n");
for (k = 0; k<G->e; k++)
{
do
{
a = getchar();
} while (!isLetter(a));
do
{
b = getchar();
} while (!isLetter(b));
p = GetPosition(*G, a);
q = GetPosition(*G, b);
G->AdjMatrix[p][q] = G->AdjMatrix[q][p] = 1;
}
}
void PrintAdjMatrix(MGraph G)
{
int i, j;
printf("The Adjacency Matrix you've entered is:\n");
for (i = 0; i<G.n; i++)
{
for (j = 0; j<G.n; j++)
{
printf("%d ", G.AdjMatrix[i][j]);
if (j == G.n - 1)
printf("\n");
}
}
}
void MatrixToList(MGraph G, AdjList *L)
{
int i, j;
ArcNode *p;
for (i = 0; i<G.n; i++)
{
L[i]->data = G.vexs[i];
L[i]->firstarc = NULL;
}
for (i = 0; i<G.n; i++)
{
for (j = 0; j<G.n; j++)
{
if (G.AdjMatrix[i][j] == 1)
{
if (L[i]->firstarc == NULL)
{
p = (ArcNode *)malloc(sizeof(ArcNode));
p->adjvex = j;
p->nextarc = NULL;
L[i]->firstarc = p;
}
else
{
p = (ArcNode *)malloc(sizeof(ArcNode));
p->adjvex = j;
p->nextarc = L[i]->firstarc;
L[i]->firstarc = p;
}
}
}
}
}
void Printlist(MGraph G, AdjList *L)
{
ArcNode *p;
int i;
for (i = 0; i<G.n; i++)
{
printf("(%d)%c->", i, L[i]->data);
p = (ArcNode *)malloc(sizeof(ArcNode));
p = L[i]->firstarc;
while (p)
{
printf("%d ", p->adjvex);
p = p->nextarc;
}
printf("\n");
}
}
int main()
{
MGraph G;
printf("Please input the number of vertexes:\n");
scanf("%d", &G.n);
printf("Please input the number of edges:\n");
scanf("%d", &G.e);
CreatMGraph(&G, G.n, G.e);
PrintAdjMatrix(G);
AdjList *L = NULL;
L = (AdjList *)malloc(sizeof(AdjList));
MatrixToList(G, L);
printf("The converted adjacency list is:\n");
Printlist(G, L);
return 0;
}

Answer 1

The subscripting of parameter L in functions MatrixToList() and Printlist() is wrong. Consider the parameter declaration AdjList *L: L is a pointer to AdjList, which in turn is defined as an array of vexnum struct VNodes, so L is a pointer to the whole array of struct VNodes. Then with an expression as L[i]->data not the ith node within the array is accessed, but the ith array of a (nonexistent for i > 0) array of arrays (and with ->data the data element in the first node of that ith array). To fix that error, you could change the parameter declaration in the mentioned functions to AdjList L as well as every instance of L[i]-> in those functions to L[i]. and call
MatrixToList(G, *L);
and
Printlist(G, *L);