# include <stdio.h>int main(void){//    int i = -5;//    printf("%#X\n", i);  // 补码输出//    int j = 0xFFFFFFF5;//    printf("%d\n", j);    char ch = 0x80;//    printf("%d\n", ch);    ch = 129;// 1000 0000    printf("%d\n", ch);    return 0;}