C古典文字列ポインタ

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, const char * argv[])
{

    //        
    char a[] = "abcdefg";//       ，   
    char *str = "abcdefg";//      ，    
    printf("%d
",sizeof(str));// = 8;         
    printf("%d
",strlen(str));// = 7;

    str = "gBGg";
    printf("%d
",sizeof(str));// = 8;
    printf("%d
",strlen(str));// = 4;
    printf("%c
",*(str+2));//=G;
    //      
    for (int i = 0; i < strlen(str); i ++) {
        printf("%c\t", *(str+i));//g B G g
    }
    printf("
");

    char chs[] = "kkkdddfff";//   
    chs[2]='G';
    printf("%s
",chs);

    //1              
    char *p = NULL;
    p = malloc(100);
    scanf("%s",p);
    printf("%s",p);
    //2              
    char *pp[100];
    scanf("%s",pp);
    printf("%s",pp);

    printf("
");
    return 0;
}