%02x (x代表以十六进制形式输出,02代表不足两位，前面补0输出，如果超过两位，则以实际输出)
例：
#include <stdio.h> #include <stdint.h> #include <string.h> typedef struct xxx{ uint8_t a; uint8_t b; uint32_t c; } stu; int main() { int i; stu s; memset(&s, 0, sizeof(s)); s.a = 0x01; s.b = 0x02; s.c = 0x1C080206; unsigned char *p = (unsigned char *)&s; for (i = 0; i < sizeof(s); i++) { printf("p[%d] = %02x ", i, p[i]); } return 0; }
运行结果：
p[0] = 01
p[1] = 02
p[2] = 00
p[3] = 00
p[4] = 06
p[5] = 02
p[6] = 08
p[7] = 1c
PS： 不考虑大小端和内存对齐。
%2x (数据不足两位,实际输出;注意：不会额外补0，如果超过两位，则以实际输出)
例：
#include <stdio.h> #include <stdint.h> #include <string.h> typedef struct xxx{ uint8_t a; uint8_t b; uint32_t c; } stu; int main() { int i; stu s; memset(&s, 0, sizeof(s)); s.a = 0x01; s.b = 0x02; s.c = 0x1C080206; unsigned char *p = (unsigned char *)&s; for (i = 0; i < sizeof(s); i++) { printf("p[%d] = %2x ", i, p[i]); } return 0; }
运行结果：
p[0] = 1
p[1] = 2
p[2] = 0
p[3] = 0
p[4] = 6
p[5] = 2
p[6] = 8
p[7] = 1c