41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
#include <stdlib.h>
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#include <iostream>
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#include <bitset>
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/**
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* Written by joe after feeling embarrased about the usage of & to find if
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* a bit 'n' was 1 or 0.
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**/
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int main(int argc, char *argv[])
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{
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if(argc<3) // If the number of args is less than 3 then there were not enough expected args.
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{
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printf("\nPlease enter both an int and a [0-7] value to check that bit.");
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exit(1); // Crash!
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}
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int BINARY_NUM = atoi(argv[1]); // Store that binary number (use ascci to int)
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int BIT = atoi(argv[2]); // What bit to check
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if(BINARY_NUM>254 || BIT>7)
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{
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printf("\nOne of your numbers was not formatted correctly, or out of range.");
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exit(1); // Crash!
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}
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// Check the bit using <<
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// Compares the number binary num using &, 1<<BIT should make a num like 0000 1000
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if(BINARY_NUM & (1<<BIT))
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{
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printf("Bit number %d is SET in number %d.\n",BIT,BINARY_NUM);
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}
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else
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{
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printf("Bit number %d is not SET in number %d.\n",BIT,BINARY_NUM);
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}
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std::cout << "BIN = " << std::bitset<8>(BINARY_NUM) << std::endl; // Send the bitset to cout
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std::cout << "BIT = " << std::bitset<8>(BIT) << std::endl; // Send the bitset to cout
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return 0;
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}
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