#include <stdio.h>
#define MAXSIZE 10000
#define v 30
typedef struct node
{
    char vert[v];
    int edge[v][v];
    int n,e;
}matrix;
void creatmatrix(matrix *gra)
{
    int p,q,x,w;
    printf("The n and e are:\n");
    scanf("%d%d",&gra->n,&gra->e);
   
    printf("The vertexs are:\n");
    for(p=0;p<gra->n;p++)
        scanf("%c",&gra->vert[p]);
    for(p=0;p<gra->n;p++)
        for(q=0;q<gra->n;q++)
            if(p==q)
                gra->edge[p][q]=0;
            else
                gra->edge[p][q]=MAXSIZE;
            printf("The edges are:\n");
            for(x=0;x<gra->e;x++)
            {
                scanf("%d%d%d",&p,&q,&w);
                gra->edge[p][q]=w;
            }
}
void print(matrix gra)
{
    int p,q;
    printf("\nThe vertexs are:\n");
    for(p=0;p<gra.n;p++)
        printf("%c",gra.vert[p]);
    printf("\n");
    printf("\nThe matrix is:\n");
    for(p=0;p<gra.n;p++)
    {
        for(q=0;q<gra.n;q++)
            printf("%8d",gra.edge[p][q]);
        printf("\n");
    }
}
int main()
{
    matrix gra;
    creatmatrix(&gra);
    print(gra);
    return 0;
}
运行结果：
The n and e are:
3 3
The vertexs are:
ABC
The edges are:

The vertexs are:
AB
The matrix is:
    0  10000  10000
10000      0  10000
10000  10000      0
以上运行结果是错误的。


正确的是：
#include <stdio.h>
#define MAXSIZE 10000
#define v 30
typedef struct node
{
    char vert[v];
    int edge[v][v];
    int n,e;
}matrix;
void creatmatrix(matrix *gra)
{
    int p,q,x,w;
    printf("The n and e are:\n");
    scanf("%d%d",&gra->n,&gra->e);
    getchar();
    printf("The vertexs are:\n");
    for(p=0;p<gra->n;p++)
        scanf("%c",&gra->vert[p]);
    for(p=0;p<gra->n;p++)
        for(q=0;q<gra->n;q++)
            if(p==q)
                gra->edge[p][q]=0;
            else
                gra->edge[p][q]=MAXSIZE;
            printf("The edges are:\n");
            for(x=0;x<gra->e;x++)
            {
                scanf("%d%d%d",&p,&q,&w);
                gra->edge[p][q]=w;
            }
}
void print(matrix gra)
{
    int p,q;
    printf("\nThe vertexs are:\n");
    for(p=0;p<gra.n;p++)
        printf("%c",gra.vert[p]);
    printf("\n");
    printf("\nThe matrix is:\n");
    for(p=0;p<gra.n;p++)
    {
        for(q=0;q<gra.n;q++)
            printf("%8d",gra.edge[p][q]);
        printf("\n");
    }
}
int main()
{
    matrix gra;
    creatmatrix(&gra);
    print(gra);
    return 0;
}
运行结果是：
The n and e are:
3 3
The vertexs are:
ABC
The edges are:
0 2 60
2 0 74
1 2 65
The vertexs are:
ABC
The matrix is:
    0  10000     60
10000      0     65
   74  10000      0
运行正确的程序比运行错误的程序就多了一条"getchar();"语句；
请各位大侠帮我分析一下，十分感谢！