Create checkbit.cpp

checkbit.cpp

@@ -0,0 +1,40 @@
+#include <stdlib.h>
+#include <iostream>
+#include <bitset>
+
+/**
+ * Written by joe after feeling embarrased about the usage of & to find if
+ * a bit 'n' was 1 or 0.
+ **/
+
+int main(int argc, char *argv[])
+{
+	if(argc<3) // If the number of args is less than 3 then there were not enough expected args.
+	{
+        printf("\nPlease enter both an int and a [0-7] value to check that bit.");
+		exit(1); // Crash!
+	}
+
+	int BINARY_NUM = atoi(argv[1]); // Store that binary number (use ascci to int)
+	int BIT = atoi(argv[2]); // What bit to check
+
+	if(BINARY_NUM>254 || BIT>7)
+	{
+		printf("\nOne of your numbers was not formatted correctly, or out of range.");
+		exit(1); // Crash!
+	}
+
+	// Check the bit using <<
+	// Compares the number binary num using &, 1<<BIT should make a num like 0000 1000
+	if(BINARY_NUM & (1<<BIT))
+	{
+		printf("Bit number %d is SET in number %d.\n",BIT,BINARY_NUM);
+	}
+	else
+	{
+		printf("Bit number %d is not SET in number %d.\n",BIT,BINARY_NUM);
+	}
+	std::cout << "BIN = " << std::bitset<8>(BINARY_NUM)  << std::endl;	// Send the bitset to cout
+	std::cout << "BIT = " << std::bitset<8>(BIT)  << std::endl;			// Send the bitset to cout
+	return 0;	
+}