C notes

0-README.md

C snipits

Some refresher C concepts and use cases.

• Notes
• web search answers
• usecases that i find meaningful
• reminders and sanity checks

Online quck refference:

• Bitwise_operations_in_C

bitwise-examples-1.c

/* Equivalent bitwise and logical operator tests */
#include <stdio.h>	// printf()

// Prototypes

void bitwise_1compliment();
void numberArray();
void charArray();


int main( void ) {

	bitwise_1compliment();
	numberArray();
	charArray();

	return 0;
}

/////////////

void bitwise_1compliment() {
	unsigned int a = 0b1101;	// 1101 // 13
	unsigned int b = 0b0001;	// 0001 // 1
	unsigned int c;

	printf( "\nBitwise 1 Compliment \n" );

	c = a ^ b;

	printf( "\n\t0b1101\t^ 0b0001\n\t%d\t^ %d\t= %d\n", a, b, c );

	unsigned char a1 = 1;	// 0001 // 1
	unsigned char b1 = 3;	// 0011 // 3
	unsigned char c1;

	c1 = a1 ^ b1;
	c1 = c1 ^

	printf( "\n\t0001\t^ 0011\n\t%d\t^ %d\t= %d \n", a1, b1, c1 );
}

void numberArray() {
	printf( "\nNumber Array \n" );

	int myArr[4]	= { 0, 0, 0, 0 };
	int a			= 1;

	printf( "\n\tmyArr[4] = { 0, 0, 0, 0 }\t%d%d%d%d \n", myArr[0], myArr[1], myArr[2], myArr[3] );

	myArr[2]		= a;
	printf( "\n\tmyArr[2] = 1\t\t\t%d%d%d%d \n", myArr[0], myArr[1], myArr[2], myArr[3] );

}

void charArray() {
	printf( "\nChar Array \n" );

	char myArr[4]	= "0000";
	char a[1]		= "1";

	printf( "\n\tchar myArr[4] = \"0000\"\t%s \n", myArr );

	myArr[2]		= a[0];
	printf( "\n\ta[1] = \"1\"\n\tmyArr[2] = a[0]\t\t%s\n", myArr );

}