scanfの入力文字時のトラップ

 
 
//       ：scanf("%c", &ch)   ch = getchar()
//  %c        
//int ：  
#include <stdio.h>
int main()
{
    int i;
    int var1, var2;
    for(i=0 ; i<10; i++)
    {
        scanf("%d%d",&var1, &var2);
        printf("i = %d
", i);
    }
    return 0;
}
//char ：  
#include <stdio.h>
int main()
{
    int i;
    char var1, var2;
    for(i=0 ; i<6; i++)
    {
        scanf("%c%c",&var1, &var2);
        //scanf("%c %c",&var1, &var2);
        printf("var1 = %d, var2 = %d
", var1, var2);
        printf("i = %d
", i);
    }
    return 0;
}
/*
         ：
a b
var1 = 97, var2 = 98
i = 0
c d
var1 = 10, var2 = 99
i = 1
var1 = 32, var2 = 100
i = 2
e f
var1 = 10, var2 = 101
i = 3
var1 = 32, var2 = 102
i = 4
g h
var1 = 10, var2 = 103
i = 5
         ：
a b
var1 = 97, var2 = 32
i = 0
var1 = 98, var2 = 10
i = 1
c d
var1 = 99, var2 = 32
i = 2
var1 = 100, var2 = 10
i = 3
e f
var1 = 101, var2 = 32
i = 4
var1 = 102, var2 = 10
i = 5
*/
//char ：  
#include <stdio.h>
int main()
{
    int i;
    char var1, var2;
    for(i=0 ; i<6; i++)
    {
        scanf("%c%*c%c", &var1, &var2);//    、Tab          
        getchar();//  '
'
        printf("var1 = %d, var2 = %d
", var1, var2);
        printf("i = %d
", i);
    }
    return 0;
}

//      ，  ①②③④ 
#include <stdio.h>
#define MAX_VERTEX_NUM 20
#define INFINITY 0x00ffffff
typedef char VertexDataType;//      
typedef char *OtherInfo;//        
enum GraphKind{DG,DN,UDG,UDN};//directed graph,directed net,undirected graph,undirected net
typedef struct
{
    int edge;//     ，1、0      ；     ，   
    OtherInfo info;
}ArcNode;//   
typedef struct
{
    int verNum;//vertex number
    int arcNum;//arc number
    VertexDataType verList[MAX_VERTEX_NUM];//    
    ArcNode arc[MAX_VERTEX_NUM][MAX_VERTEX_NUM];
    enum GraphKind kind;
}AdjMatrix;//adjacency matrix(    )
void createDN(AdjMatrix *G);

//         
int main(void)
{
    AdjMatrix G;
    createDN(&G);
    printf("create successfully!
");

    return 0;
}
//locate the index of the vertex
int locateVer(AdjMatrix *G, const VertexDataType *ver)
{
    int i;
    for(i = 0; i < G->verNum; i++)
    {
        if(G->verList[i] == *ver)
        {
            break;
        }
    }
    return i;
}
//create directed net
void createDN(AdjMatrix *G)
{
    int i, j;
    VertexDataType v1, v2;
    int weight;
    printf("       、    ：");
    scanf("%d%d", &(G->verNum), &(G->arcNum));
    getchar();//①
    printf("       ：");
    for(i = 0; i < G->verNum; i++)
    {
        scanf("%c", G->verList+i);
        getchar();//②
    }
    for(i = 0; i < G->verNum; i++)
    {
        printf("%d ", G->verList[i]);
    }
    printf("
");
    //       
    for(i = 0; i < G->verNum; i++)
    {
        for(j = 0; j < G->verNum; j++)
        {
            G->arc[i][j].edge = INFINITY;
            G->arc[i][j].info = NULL;
        }
    }
    //      
    printf("       、  、  ：
");
    for(i = 0; i < G->arcNum; i++)
    {
        scanf("%c%*c%c%d", &v1, &v2, &weight);//③（%*c       ）
        getchar();//④
        printf("i = %d
", i);
        int temp1 = locateVer(G, &v1);//       
        int temp2 = locateVer(G, &v2);
        G->arc[temp1][temp2].edge = weight;
        printf("output:%c %c %d
", G->verList[temp1], G->verList[temp2], G->arc[temp1][temp2].edge);
    }
    G->kind = DN;
}
/* test data and result
       、    ：6 10
       ：a b c d e f
       、  、  ：
a b 5
a c 4
a d 1
b d 6
b e 3
c d 7
c f 6
d e 5
d f 2
e f 5
*/