sizeof与strlen

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void main()
{
    char *str = "123456";
    char str2[10]="123456";
    printf("sizeof char is %d\n",sizeof(char));
    printf("sizeof char* is %d\n",sizeof(char*));
    printf("sizeof int is %d\n",sizeof(int));
    printf("sizeof int* is %d\n",sizeof(int*));
    printf("str is %s\n",str);
    printf("sizeof str is %d\n",sizeof(str));
    printf("lenof str is %d\n",strlen(str));
    printf("str[10] is %s\n",str2);
    printf("sizeof str2[10] is %d\n",sizeof(str2));
    printf("lenof str2[10] is %d\n",strlen(str2));
}

sizeof char is 1
sizeof char* is 4
sizeof int is 4
sizeof int* is 4
str is 123456
sizeof str is 4
lenof str is 6
str[10] is 123456
sizeof str2[10] is 10
lenof str2[10] is 6



sizeof对于指针求指针类型的大小（32位机为4字节），对于数组求数组所占大小