判断位&设置位

/* ******************************** * 将某一个char中的第local位置为1 * *********************************/int SetBit(unsigned char *Des, int local){const static int markbuf[ ] = { 0x1, 0x2, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80 };if ( local > 8 ){return 0;}Des[ 0 ] |= markbuf[ local - 1 ]; /* local对应数组第local-1 */return 1;}/* ******************************** * 判断char中的第local位置是否为1 * *********************************/int CompareBit(unsigned char *Des, int local){const static int markbuf[ ] = { 0x1, 0x2, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80 };if ( local > 8 ){return 0;}return (Des[ 0 ] & markbuf[ local+1 ]) == markbuf[ local+1 ];}