字符数组与指针

char数组

//char数组就是n个地址连续的char
static void print_char_arr(char *p, size_t len) {
    for (size_t i = 0; i < len; ++i) {
        char c = *(p + i);
        printf("%c ", c);
    }
    printf("\n");
}

int main() {
    char c1 = 'a';
    char c2 = 'b';
    char c3 = 'c';
    char arr[3] = { c1, c2, c3 };
    printf("%p, %p, %p\n", &arr[0], &arr[1], &arr[2]); //3个地址连续的char变量
    printf("%p, %p, %p\n", arr, &arr, &arr[0]); //都表示第1个char变量的地址
    print_char_arr(arr, sizeof(arr)/sizeof(char));

    printf("%p, %p, %p\n", &c1, &c2, &c3);
}

 

static void print_char_arr2(char *p) {
    int i = 0;
    char c;
    while(c = *(p++)) {
        printf("%c, ", c);
    }
    printf("\n");
}


int main() {
    char* str = "abc"; //会被编译器处理为 {'a', 'b', 'c', '\0'}
    str[0] = 't';
    print_char_arr2(str);
}

 

char*数组

static void print_charp_arr(char** p, size_t len) {
    for (size_t i = 0; i < len; ++i) {
        char* cp = *(p + i);
        char c = *cp;
        printf("%c ", c);
    }
    printf("\n");
}

int main() {
    char c1 = 'a';
    char c2 = 'b';
    char c3 = 'c';
    char* arr[3] = { &c1, &c2, &c3 };
    printf("%p, %p, %p\n", &arr[0], &arr[1], &arr[2]); //3个地址连续的char*变量, 变量间相差8个字节(Win64)
    printf("%p, %p, %p\n", arr, &arr, &arr[0]); //都表示第1个char*变量的地址
    print_charp_arr(arr, sizeof(arr)/sizeof(char*));

    printf("%p, %p, %p\n", &c1, &c2, &c3);
    printf("%p, %p, %p\n", arr[0], arr[1], arr[2]); //数组元素存放的是char的地址
}