#include"stdio.h"
#include"malloc.h"
#define MAXVER 10
typedef char ElemType;
typedef struct node
{ int num;
  struct node *next;
}slink;
typedef struct
{ struct
    { ElemType vertex;
      slink *first;
    }ve[MAXVER];
    int vex,edge,tag;
}adjlist;

//邻接表的建立
void cregraph(adjlist *G,int n,int m)
{ int i,e=0;slink *p,*q,*s;char x,y;
  G->vex=n;G->tag=m;
  for(i=0;i<n;i++)
  { G->ve[i].vertex=i+'A';G->ve[i].first=NULL;}
  printf("Input edges(x-->y):");
  scanf("%c%c",&x,&y);
  printf("%c%c",x,y);
}

void main()
{ adjlist G;
  int n,m;
  scanf("%d%d",&n,&m);
  cregraph(&G,n,m);
}

为何输入XY却只能出来Y啊

换行赋给x，y获取了'x'的值，所以结果打印\n和'x'
空了一行再打印y的值