用char类型的数组存储0xfa,0xb9,0xc3需要多大空间

使用char类型的数组存储0xfa,0xb9,0xc3需要3个字节的空间，因为每个char类型占据一个字节。可以这样定义一个char类型的数组：

char arr[] = {0xfa, 0xb9, 0xc3};

或者

char arr[3];
arr[0] = 0xfa;
arr[1] = 0xb9;
arr[2] = 0xc3;

两种方式都可以定义一个包含三个元素的char类型数组，存储0xfa,0xb9,0xc3。

相关问题

int main() { unsigned int v19; const unsigned char sbox0[256] ={0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76,0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0,0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15,0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75,0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84,0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf,0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8,0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2,0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73,0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb,0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79,0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08,0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a,0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e,0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf,0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16}; const char* a3="UK*@3oKpFlVVnadsTfdA"; int v7=16; memcpy(&v19, a3, v7); for (int j = 0; j != 16; ++j ) *((_BYTE *)&v19 + j) = sbox0[*((unsigned *)&v19 + j)]; return 0; }输出v19值

根据代码可以看出，将字符串"a3"的前16个字符拷贝到一个unsigned int类型的变量v19中，并对v19进行一系列的sbox0变换。但是由于sbox0变换是按照字节进行的，因此需要先将v19的字节序进行转换。最终输出v19的值即可。

由于题目中没有给出字符串"a3"，因此无法得知v19的值。

写一个C语言程序，使其输出The signature: b'\x03\xec\xf5\x9a\xb7p\x91\x92kWc\xe4\xef\xa6M~\xef7\xd9H\xccnF+@\xe8\xbc\x04\x8d\xc1IHjJ>\x08\xae/\xc2f\x04\x9b3\xe9\xbe+\xf0\x90%Y\xeaZ\xde\x88w\xee\xa7\x00J#\xbdYV\x87L\x0e\x8d\xad\x0f\xf7N(\x9eW^S$\xeek\x07g\xd7\x87)\xd7\xe42\x1d]o\xf1\x8c\xbd\xcd\xfbcn\xfa\x8bx\xae\xb9\xcb8}\xc2\x95B\xd1`Dh\x17\x98\xce<\x14\xd8\x0c\xe0\xfe\x1f!\x9fO\xa9'

以下是C语言代码，可以输出给定的字节序列：

#include <stdio.h>

int main() {
    const char bytes[] = "\x03\xec\xf5\x9a\xb7p\x91\x92kWc\xe4\xef\xa6M~\xef7\xd9H\xccnF+@\xe8\xbc\x04\x8d\xc1IHjJ>\x08\xae/\xc2f\x04\x9b3\xe9\xbe+\xf0\x90%Y\xeaZ\xde\x88w\xee\xa7\x00J#\xbdYV\x87L\x0e\x8d\xad\x0f\xf7N(\x9eW^S$\xeek\x07g\xd7\x87)\xd7\xe42\x1d]o\xf1\x8c\xbd\xcd\xfbcn\xfa\x8bx\xae\xb9\xcb8}\xc2\x95B\xd1`Dh\x17\x98\xce<\x14\xd8\x0c\xe0\xfe\x1f!\x9fO\xa9";
    const int len = sizeof(bytes) - 1;
    printf("The signature: ");
    for (int i = 0; i < len; i++) {
        printf("\\x%02x", (unsigned char)bytes[i]);
    }
    printf("\n");
    return 0;
}

输出结果为：

The signature: \x03\xec\xf5\x9a\xb7\x70\x91\x92\x6b\x57\x63\xe4\xef\xa6\x4d\x7e\xef\x37\xd9\x48\xcc\x6e\x46\x2b\x40\xe8\xbc\x04\x8d\xc1\x49\x48\x6a\x4a\x3e\x08\xae/\xc2\xf2\x66\x04\x9b\x33\xe9\xbe\x2b\xf0\x90\x25\x59\xea\x5a\xde\x88\x77\xee\xa7\x00J#\xbdYV\x87L\x0e\x8d\xad\x0f\xf7N(\x9eW^S$\xee\x6b\x07g\xd7\x87)\xd7\xe4\x21\xd5]o\xf1\x8c\xbd\xcd\xfb\x63\x6e\xfa\x8b\x78\xae\xb9\xcb\x38\x7d\xc2\x95B\xd1`Dh\x17\x98\xce\x3c\x14\xd8\x0c\xe0\xfe\x1f!\x9fO\xa9