For this problem, assume that you are developing code in the C language for a 32

Question

For this problem, assume that you are developing code in the C language for a 32-bit CPU such as the PIC32. Also assume that you are using an integer named k, which has been initialized. As usual, bit position 0 refers to the least-significant bit. a) Write a single instruction that will set bit 4 and bit 5 of k to 1, without affecting any other bits of k. b) Write a single instruction that will clear bit 4 and bit 5 of k to 0, without affecting any other bits of k. c) Write a single instruction that will clear the most significant bit of k to 0, without affecting any other bits of k. d) Write a single instruction that will set all bits in the most-significant byte of k to 1, without affecting any other bits of k. e) Write 1 or 2 instructions that will cause the least-significant byte of k to contain the bit pattern 11110000, without affecting any other bits of k.

Explanation / Answer

bitwise or is generally used for setting: |
bitwise and is generally used for clearing: &

1. num|48 bin=110000
2. num&4294967247 bin=11111111111111111111111111001111
3. num&2147483647 bin=01111111111111111111111111111111   
4. num|4278190080 bin=11111111000000000000000000000000
5. num=num|240;num=num&4294967280 ;

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