Chapter 22: Miscellaneous Features.md

[Chapter 22: Miscellaneous Features] Solutions

[A]

(a) 0 1 2

(b) 1.0

(c) 4

[B]

(a) No Error

(b) There are two methods to invoke a function,
(*func)();
func();

(c) No Error

[C]

(a)

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

float one(int, int);
float two(int, int);
float three(int, int);
float four(int, int);

int main()
{
float(*ptr[4])(int, int);
float a, b, c, d;
ptr[0] = one;
ptr[1] = two;
ptr[2] = three;
ptr[3] = four;
a = ptr[0](1, 2);
b = ptr[1](2, 4);
c = ptr[2](6, 3);
d = ptr[3](22, 7);
printf("a : %f\tb : %f\n", a, b);
printf("c : %f\td : %f\n", c, d);
_getch();
return 0;
}
float one(int a, int b)
{
float r;
r = (float)a / b;

return r;
}
float two(int x, int y)
{
float ans;
ans = (float)x / y;
return ans;
}
float three(int i, int j)
{
float a;
a = (float)i / j;
return a;
}
float four(int m, int n)
{
return ((float)m / n);
}

(b)

#include<stdio.h>
#include<conio.h>
#include<stdarg.h>

void type(int, ...);

int main()
{	
type(5, 4, 6, 3, 6, 7);
return 0;
}

void type(int point, ...)
{
if (point < 1)
{
	printf("Nothing can be draw.");
	return;
}
switch (point)
{
case 1:
	printf("A point can be drawn.\n");
	break;
case 2:
	printf("A line can be drawn.\n");
	break;
case 3:
	printf("A triangle can be drawn.\n");
	break;
case 4:
	printf("A rectangle can be drwan.\n");
	break;
case 5:
	printf("A pentagon can be drawn.\n");
	break;
case 6:
	printf("A hexagon can be drawn.\n");
	break;
default:
	printf("A polygon can be drawn.\n");
}
}

(c)

#include<stdio.h>
#include<conio.h>
#include<stdarg.h>
#include<Windows.h>

#define MAX 5

typedef struct date
{
unsigned d : 5;
unsigned m : 4;
unsigned y : 12;
}EMP;

void swap(EMP*, EMP*);

int main()
{

int i, j;
EMP e[10], a[10];
e[0].y = 2010; e[0].m = 12; e[0].d = 10;
e[1].y = 1990; e[1].m = 3; e[1].d = 23;
e[2].y = 1995; e[2].m = 4; e[2].d = 13;
e[3].y = 2001; e[3].m = 1; e[3].d = 13;
e[4].y = 1990; e[4].m = 3; e[4].d = 20;
e[5].y = 1992; e[5].m = 6; e[5].d = 19;

for (i = 0; i < MAX; i++)
	a[i] = e[i];

for (i = 0; i < MAX; i++)
{
	for (j = i + 1; j < MAX; j++)
	{
		if (a[j].y < a[i].y)
			swap(&a[i], &a[j]);
		if (a[j].y == a[i].y)
		{
			if (a[j].m < a[i].m)
				swap(&a[i], &a[j]);
			if (a[j].m == a[i].m)
				if (a[j].d < a[i].d)
					swap(&a[i], &a[j]);
		}
	}
}

system("cls");
for (i = 0; i <= 4; i++)
{
	printf("\nEmplyee no. %d : ", i + 1);
	printf("%2d/%2d/%4d", a[i].d, a[i].m, a[i].y);
}
_getch();
return 0;
}
void swap(EMP *a, EMP *b)
{
EMP c;
c = *a;
*a = *b;
*b = c;
}

(d)

#include<stdio.h>
#include<conio.h>
#include<Windows.h>

#define MAX 2

int main()
{
enum sex { male, female };
enum level { major, minor };
typedef struct people
{
	enum sex gender;
	enum level age_level;
	char policy_name[10];
	unsigned int duration_in_year;
} PEOPLE;
PEOPLE p[MAX];
int i, enm;
for (i = 0; i < MAX; i++)
{
	printf("\nEnter the gender (male = 0 or female = 1) : ");
	scanf("%d", &enm);
	enm ? (p[i].gender = female) : (p[i].gender = male);
	printf("\nEnter the age status (major = 0 or minor = 1) : ");
	scanf("%d", &enm);
	enm ? (p[i].age_level = minor) : (p[i].age_level = major);

	//Clearing input stream
	while (getchar() != '\n');

	printf("\nEnter name of the customer : ");
	gets_s(p[i].policy_name);
	printf("\nEnter the duration (in years) : ");
	scanf("%d", &p[i].duration_in_year);
}
system("cls");
for (i = 0; i < MAX; i++)
{
	printf("\n%d\t%d", p[i].gender, p[i].age_level);
	printf("\t%s\t%d", p[i].policy_name, p[i].duration_in_year);
}
_getch();
return 0;
 }