char与 unsigned char类型变量打印，注意事项

char与 unsigned char类型变量打印注意事项char ss; unsigned char ss_1; // 打印数值 printf(%d\n, ss); // char printf(%u\n, ss_1); // unsigned char // 以字符形式打印输出 printf(%c\n, ss); printf(%c\n, ss_1);