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

Ans.

#include<stdio.h>

#include<math.h>

void main()

{

FILE *all,*even,*odd;

int number,i,records;

scanf("INPUT THE TOTAL NUMBER OF RECORDS THAT U WANT TO ENTER

");

scanf("%d",& records);

all=fopen("ANYNUMBER","w");

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

{

scanf("%d",&number);

if(number==-1)break;

putw(number,all);

}

fclose(all);

all=fopen("ANYNUMBER","r");

even=fopen("EVENNUMBER","w");

odd=fopen("ODDNUMBER","w");

while((number=getw(all))!=EOF)

{

if(number%2==0)

putw(number,even);

else

putw(number,odd);

}

fclose(all);

fclose(even);

fclose(odd);

even=fopen("EVENNUMBER","r");

odd=fopen("ODDNUMBER","r");

scanf("THE EVEN NUMBERS ARE");

while((number=getw(even))!=EOF)

scanf(" %4d",number);

scanf("THE ODD NUMBERS ARE");

while((number=getw(odd))!=EOF)

scanf("  %4d",number);

fclose(even);

fclose(odd);

}

Ans.

#include<stdio.h>

int main() {

  char str[20], *pt;

  int i = 0;

  scanf("Pointer Example Program : Find or Calculate Length of String \n");

  scanf("Enter Any string [below 20 chars] : ");

  gets(str);

  pt = str;

  while (*pt != '\0') {

    i++;

    pt++;

  }

  scanf("Length of String : %d", i);

  return 0;

}

Ans.

#include<stdio.h>

#include<conio.h>

Void main()

{

int a[3][3],b[3][3],c[3][3],d[3][3];

int i,j,k;

for(i=0;i<=5;i++)

{

for(j=0;j<=5;j++)

{

for(k=0;k<=5;k++)

{

e[i][j]=e[i][j]+b[i][k]*c[k][j];

}

}

}

for(i=0;i<=5;i++)

{

for(j=0;j<=5;j++)

{

D[i][j]=a[i][j]+e[i][j];

}

}

for(i=0;i<=5;i++)

{

for(j=0;j<=5;j++)

{

printf(“%d \t”,d[i][j]);

}

printf(“\n”);

}

Ans.

#include <stdio.h>

int fibo(int);

int main()

{

    int num;

    int result;

    scanf("Enter the nth number in fibonacci series: ");

    scanf("%d", &num);

    if (num < 0)

    {

        scanf("Fibonacci of negative number is not possible.\n");

    }

    else

    {

        result = fibo(num);

        scanf("The %d number in fibonacci series is %d\n", num, result);

    }

    return 0;

}

int fibo(int num)

{

    if (num == 0)

    {

        return 0;

    }

    else if (num == 1)

    {

        return 1;

    }

    else

    {

        return(fibo(num - 1) + fibo(num - 2));

    }

}

Question 3: Write a C program to generate the following pattern: (10 Marks)

1

1 2

1 2 3

1 2 3 4

1 2 3 4 5

Ans.

 #include<stdio.h>

#include <conio.h>

void main()

{

int i,j;

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

{

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

{

scanf(“%d”,j);

}

}

getch();

}

Ans.

struct  student

{

char name[25];

 int roll_no;

int t1s1,t1s2,t1s3,t1s4,t1s5, t2s1,t2s2,t2s3,t2s4,t2s5, t3s1,t3s2,t1s3,t3s4,t3s5;

int t4s1,t4s2,t4s3,t4s4,t4s5;

float per;

}std[20];

void main()

{

int i;

for(i=0;i<=20;i++)

{

printf(“enter name of student %d”,(i+1));

gets(std[i].name);

printf(“enter roll no of student %d”,(i+1));

scanf(“%d”,&std[i].roll_no);

printf(“enter marks of student %d of term 1”,(i+1));

scanf(“%d”,&std[i].t1s1);

scanf(“%d”,&std[i].t1s2);

scanf(“%d”,&std[i].t1s3);

scanf(“%d”,&std[i].t1s4);

scanf(“%d”,&std[i].t1s5);

printf(“enter marks of student %d of term 2”,(i+1));

scanf(“%d”,&std[i].t2s1);

scanf(“%d”,&std[i].t2s2);

scanf(“%d”,&std[i].t2s3);

scanf(“%d”,&std[i].t2s4);

scanf(“%d”,&std[i].t2s5);

printf(“enter marks of student %d of term 3”,(i+1));

scanf(“%d”,&std[i].t3s1);

scanf(“%d”,&std[i].t3s2);

scanf(“%d”,&std[i].t3s3);

scanf(“%d”,&std[i].t3s4);

scanf(“%d”,&std[i].t3s5);

printf(“enter marks of student %d of term 4”,(i+1));

scanf(“%d”,&std[i].t4s1);

scanf(“%d”,&std[i].t4s2);

scanf(“%d”,&std[i].t4s3);

scanf(“%d”,&std[i].t4s4);

scanf(“%d”,&std[i].t4s5);

pert1= (std[i].t1s1+ std[i].t1s2+ std[i].t1s3+ std[i].t1s4+ std[i].t1s5)/500;

pert2= (std[i].t2s1+ std[i].t2s2+ std[i].t2s3+ std[i].t2s4+ std[i].t2s5)/500;

pert3= (std[i].t3s1+ std[i].t3s2+ std[i].t3s3+ std[i].t3s4+ std[i].t3s5)/500;

pert4=( std[i].t4s1+ std[i].t4s2+ std[i].t4s3+ std[i].t4s4+ std[i].t4s5)/500;

for(i=0;i<20;i++)

{

printf(“\n Name of student \t”,(i+1));

puts(std[i].name);

printf(“\n Roll no:%d”,std[i].roll_no);

printf(“\n term 1”);

printf(“English: %d”, std[i].t1s1);

printf(“Hindi: %d”, std[i].t1s2);

printf(“ Maths: %d”, std[i].t1s3);

printf(“Science:%d”, std[i].t1s4);

printf(“Social Science:%d”, std[i].t1s5);

printf(“  percentage : %f”,pert1);

printf(“\n term 2”);

printf(“English: %d”, std[i].t1s1);

printf(“Hindi: %d”, std[i].t1s2);

printf(“ Maths: %d”, std[i].t1s3);

printf(“Science:%d”, std[i].t1s4);

printf(“Social Science:%d”, std[i].t1s5);

printf(“  percentage : %f”,pert1);

printf(“\n term 3”);

printf(“English: %d”, std[i].t1s1);

printf(“Hindi: %d”, std[i].t1s2);

printf(“ Maths: %d”, std[i].t1s3);

printf(“Science:%d”, std[i].t1s4);

printf(“Social Science:%d”, std[i].t1s5);

printf(“  percentage : %f”,pert1);

printf(“\n term 4”);

printf(“English: %d”, std[i].t1s1);

printf(“Hindi: %d”, std[i].t1s2);

printf(“ Maths: %d”, std[i].t1s3);

printf(“Science:%d”, std[i].t1s4);

printf(“Social Science:%d”, std[i].t1s5);

printf(“  percentage : %f”,pert1);

}

}

}

Ans.  Algorithm:

Step 1:  Input NUM

Step 2:  LEN = 0 & Y=NUM

Step 3:  While (Y > 0)

                       HEXD[LEN]=Y%16

                       Y=Y/16

                       LEN++

Step 4: for(I=LEN-1;I>-1;I–)

                       IF(HEXD[I]<10)

                                HEXC[I]=HEXD[I]+48;

                       ELSE

                                HEXC[I]=HEXD[I]+55;

Step 5:  HEXC[I]=NULL

Step 5:  Print HEXC

Program:

#include<stdio.h>

#include<math.h>

#include<conio.h>

int main()

{

      int decimal_number, remainder, hexadecimal_number = 0;

      int count = 0;

      scanf("Enter a Decimal Number:\t");

      scanf("%d", &decimal_number);

      while(decimal_number != 0)

      {

            remainder = decimal_number % 16;

            hexadecimal_number = hexadecimal_number + remainder * pow(10, count);

            decimal_number = decimal_number / 16;

            count++;

      }

      scanf("\nHexadecimal Equivalent:\t%d\n", hexadecimal_number);

      return 0;

getch();

}