Chapter - 15: Operations On Bits

A company planning to launch a new newspaper in market conducts a survey. The various parameters considered in the survey were, the economic status (upper, middle, and lower class) the languages readers prefer (English, Hindi, Regional language) and category of paper (daily, supplement, tabloid). Write a program, which reads data of 10 respondents through the keyboard, and stores the information in an array of integers. The bit-wise information to be stored in an integer is given below:


A
Sections
2
Exercises

Bit Number Information

 0  Upper class
 1  Middle class
 2  Lower class
 3  English
 4  Hindi
 5  Regional Language
 6  Daily
 7  Supplement
 8  Tabloid

 At the end give the statistical data for the number of persons who read English daily, a number of upper-class people who read tabloid and number of regional language readers. 


#include<stdio.h>
#include<conio.h>
#include<windows.h>
#include<math.h>

#define _BV(x) 1<<x

//Binary To Decimal
int bintodec(int *);
void initinfo(int *);
void addinfo(int*);

int main()
{
	int i, information[10], eng_daily, up_tabloid, regional;
	eng_daily = up_tabloid = regional = 0;
	unsigned int andmask, j;
	for (i = 0; i <= 9; i++)
	{
		printf("\nRespondent number %d\n", i + 1);

		addinfo(&information[i]);
		//	000100100	(people that reads english(3) daily(6),)
		andmask = _BV(2) | _BV(5);
		j = information[i] & andmask;
		if (j == andmask)
			eng_daily++;

		//	100000001	(people with Upper(0) class and tabloid(8))
		andmask = _BV(0) | _BV(8);
		j = information[i] & andmask;
		if (j == andmask)
			up_tabloid++;

		//	000001000 (people that reads in regional(5))
		andmask = _BV(3);
		j = information[i] & andmask;
		if (j == andmask)
			regional++;
	}

	printf("\nStatical Data :-\n");
	printf("\nPersons read English newspaper : %d", eng_daily);
	printf("\nPersons belongs to Upper class and read Tabloid are : %d", up_tabloid);
	printf("\nPersons read newspaper in regional language are : %d", regional);
	_getch();
	return 0;
}

int bintodec(int *num)
{
	int i, dec = 0;
	for (i = 0; i <= 8; i++)
		dec += num[i] * (int)pow(2, 8 - i);
	return dec;
}

void initinfo(int *information)
{
	int i;
	for (i = 0; i <= 8; i++)
		information[i] = 0;
}

void addinfo(int *information)
{
	int choice, info[9];
	printf("\nChoose your economical class\n");
	printf("1. Upper Class\n2. Middle Class\n");
	printf("3. Lower Class\n");
	scanf("%d", &choice);
	initinfo(info);
	switch (choice)
	{
	case 1:
		info[0] = 1;
		break;
	case 2:
		info[1] = 1;
		break;
	case 3:
		info[2] = 1;
	default:
		break;
	}
	printf("\nChoose your language\n");
	printf("1. English\n2. Hindi\n3. Regional\n");
	scanf("%d", &choice);
	switch (choice)
	{
	case 1:
		info[3] = 1;
		break;
	case 2:
		info[4] = 1;
		break;
	case 3:
		info[5] = 1;
		break;
	default:
		break;
	}
	printf("\nChoose your newspaper category\n");
	printf("\n1. Daily\n2. Supplement\n3. Tabloid\n");
	scanf("%d", &choice);
	switch (choice)
	{
	case 1:
		info[6] = 1;
		break;
	case 2:
		info[7] = 1;
		break;
	case 3:
		info[8] = 1;
		break;
	default:
		break;
	}
	*information = bintodec(info);
	system("cls");
}

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