Question
Each function should perform a series of bitwise operations (usually just one) on an integer, and return the resulting integer. It needs to be done
Each function should perform a series of bitwise operations (usually just one) on an integer, and return the resulting integer.
It needs to be done using ONLY bitwise operations, except for the following functions where an "if" statement is okay:
- ifBit7is0
- ifBit3is1
- signedBits0through5
- signedBits6through9
Here is a table showing examples of the output for each function:
Function | Input | Output |
---|---|---|
multiplyBy8 | 7 | 56 |
setBit6to1 | 0x01 | 0x41 |
setBit3to0 | 0xffff | 0xfff7 |
flipBit5 | 0x01 | 0x21 |
ifBit7is0 | 0x77 | nonzero |
ifBit3is1 | 0x77 | 0 |
unsignedBits0through5 | 0x335 | 0x35 |
unsignedBits6through9 | 0x3b4 | 0xe |
signedBits0through5 | 0x3fa | 0xfffffffa |
signedBits6through9 | 0xcf7 | 0x03 |
signedBits0through5 | 0x38f | 0xf |
signedBits6through9 | 0x38f | 0xfffffffe |
setBits4through9 | (0xffffffff, 0x23) | 0xfffffe3f |
The function that needs the most explanation is setBits4through9. Think of this as replacing bits 4-9 (inclusive) with the second input's lowest bits. Leave the rest of the input's bits unchanged.
Any extracted bits should be returned in the lowest bits of the return value. For example, in unsignedBits6through9, if bits 0110 were extracted from the value, then 0110 with 28 leading zeros should be returned (we are working with 32-bit integers).
Here is the .c file that needs to be edited...
#include "stdio.h" #include "stdlib.h" int multiplyBy8(int v) { // TODO: multiply the number by 8 return v; } int setBit6to1(int v) { // TODO: set bit 6 to 1 return v; } int setBit3to0(int v) { // TODO: set bit 3 to 0 return v; } int flipBit5(int v) { // TODO: flip bit 5 (if it is 0, make it 1. If 0, make 1) return v; } int ifBit7is0(int v) { // TODO: check to see if bit 7 is a 0 - return 1 if true, 0 if false return v; } int ifBit3is1(int v) { // check to see if bit 3 is a 1 - return 1 if true, 0 if false return v; } int unsignedBits0through5(int v) { // return the unsigned value in bits 0 through 5 return v; } int unsignedBits6through9(int v) { // return the unsigned value in bits 6 through 9 return v; } int signedBits0through5(int v) { // return the signed value in bits 0 through 5 return v; } int signedBits6through9(int v) { // return the signed value in bits 6 through 9 return v; } int setBits4through9(int v, int setValue) { // set bits 4 through 9 in v to become setValue return v; }
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