{}
#include <iostream>
int main() {
// 10 进制
int a = 123;
std::cout << "10 进制: " << a << std::endl;
// 8 进制
int b = 0123; // 0123 (八进制) = 8*8*1 + 8*2 + 3 = 64 + 16 + 3 = 83 (十进制)
std::cout << "8 进制 (0123): " << b << std::endl;
// 16 进制
int c = 0x1A; // 0x1A (十六进制) = 1*16 + 10 = 26 (十进制)
std::cout << "16 进制 (0x1A): " << c << std::endl;
// 类型后缀
long d = 123L;
unsigned int e = 123U;
unsigned long f = 123UL;
std::cout << "带 L 后缀的 long 类型: " << d << std::endl;
std::cout << "带 U 后缀的 unsigned int 类型: " << e << std::endl;
std::cout << "带 UL 后缀的 unsigned long 类型: " << f << std::endl;
// 演示类型后缀和不同进制的组合
unsigned long g = 0xFAUL; // 0xFA (十六进制) = 15*16 + 10 = 240 + 10 = 250
std::cout << "16 进制并带 UL 后缀: " << g << std::endl;
return 0;
}