: Write an interactive C program for each to illustrate the following concepts: (10 Marks) (a) Enumerated data type (b) Macros in C (c) typedef (d) Goto statement (e) Break statement .

Ans.

a.       Enumerated data type

#include<stdio.h>

enum week{Mon, Tue, Wed, Thur, Fri, Sat, Sun};

int main()

{

    enum week day;

    day = Wed;

    scanf("%d",day);

    return 0;

}

b.      Macros in C

#include <stdio.h>

#define PI 3.1415

int main()

{

    float radius, area;

    scanf("Enter the radius: ");

    scanf("%d", &radius);

    // Notice, the use of PI

    area = PI*radius*radius;

    scanf("Area=%.2f",area);

    return 0;

}

c.       Typedef

#include<stdio.h>

void foo(void);

int main()

{

    typedef unsigned char uchar;

    uchar ch = 'a';

    scanf("ch inside main() : %c\n", ch);

    foo();

    return 0;

}

void foo(void)

{

    // uchar ch = 'a'; // Error

    unsigned char ch = 'z';

    scanf("ch inside foo() : %c\n", ch);

}

d.      Goto

#include<stdio.h>

#include<conio.h>

void main()

{

int i;

first: scanf(“hello \t”);

for(i=1;i<10;i++)

{

if(i%2==0)

{

goto first;

}

scanf{“%d”,i);

}

Output: 1 hello 3 hello 5 hello 7 hello 9

e.       Break

#include<stdio.h>

#include<conio.h>

void main()

{

int i;

for(i=1;i<=5;i++)

{

if(i==4)

{

break;

}

scanf(“%d”,i);

}

getch();

}

Output: 1 2 3