From: http://blog.csdn.net/zzqhost/article/details/6064886

完整程序如下：

[zcm@c #51]$cat a.c
// linux平台C程序
#include <stdio.h>
typedef unsigned long long int64;
typedef unsigned long long uint64;
int main ( void )
{
int64    c = 0x123456789LL;        // 有符号
uint64    uc = 0x123456789ULL;    // 无符号
printf("%lld, %llu\n", c, uc);    // 整数形式输出
printf("%llx, %llx\n", c, uc);    // 十六进制格式输出
printf("%#llx, %#llx\n", c, uc);// 带0x的十六进制格式输出
return 0;
}
[zcm@c #53]$make
gcc -g -O2 -o a a.c
[zcm@c #54]$./a
4886718345, 4886718345
123456789, 123456789
0x123456789, 0x123456789
[zcm@c #55]$