每天学习c++一小时-expressions, operations and statements
1.using count to display on the screen with semicolon “;” ending
2.whitespace is not visible to the compiler, but whitespace with string literals makes difference
3.inserting backslash() at the end to spread a statement over two lines
4.prefix ++number L-value is the incremented value VS postfix number++ L-value is the original number
5.NOT ! AND && OR ||
6.1000>>1 =0100 1000>>2 =00100
1000<<1 =10000 1000<<2 =100000
7.bitset<8> inputBits(number) means transforming number into 2-Bits
8.bitset<8> bitwiseNOT = (~inputNum);
bitset<8> bitwiseAND = (0x0F & inputNum);// 0x0F is hex for 0001111
bitset<8> bitwiseOR = (0x0F | inputNum);
~10110101 = 01001010
Logical AND, & with 00001111
0001111 & 10110101 = 00000101
Logical OR, | with 00001111
00001111 | 10110101 = 10111111
Logical XOR, ^ with 00001111
00001111 ^ 10110101 = 10111010
9.the result of shifting signed numbers is implementation dependent. On some compilers, most-significant-bit when shifted left is not assigned to the least-significant-bit; rather the latter is zero.
