SUM OF DIGITS

AIM

To write a C program to find the sum of digits of a given number.

ALGORITHM

Step 1: Start

Step 2: Read num

Step 3: rß(num%10)

            numß(num/10)

            sumß(sum+r)

Step 4: if (num>0) go to step 3

Step 5: Print sum

Step 6: Stop

PROGRAM

#include<conio.h>

void main()

{

    int num,r,s=0;

    printf("Enter the number\n");

    scanf("%d",&num);

    while(num>0)

    {

    r=num%10;

    s=s+r,num=num/10;

    }

    printf("Sum of digits = %d",s);

}

‘n’ NATURAL NUMBERS AND ITS SUM

AIM

To write a C program to find the sum of ‘n’ natural numbers and its sum.

ALGORITHM

Step 1: Start

Step 2: Read n

Step 3: if (n=0), if not go to step 5

Step 4: Print Invalid number, go to step 2

Step 5: ißn, sß1, Print i

Step 6: if (i=0), if not go to step 8

Step 7: Print s, go to step 10

Step 8: sß(s+1)

Step 9: iß(i-1), go to step 4

Step 10: Stop

PROGRAM

#include<conio.h>

#include<stdio.h>

void main()

{

int i,n,s=0;

            printf(“Enter your limit:”);

            scanf(“%d”,&n);

            if (n==0)

                        printf(“\nEnter a valid number”);

            printf(“Numbers:”);

            for (i=1;i<=n;i++)

            {

                        printf(“%d\t”,i);

                        s=s+i;

}

printf(“\nSum:%d”,s);

            getch();

}

AVERAGE MARK AND GRADE OF STUDENTS

AIM

To write a C program to calculate the average mark and grade of students using switch.

ALGORITHM

Step 1: Start

Step 2: Read n, m1, m2, m3, m4, m5, iß0

Step 3: if (i<n), if not go to step 19

Step 4: avgß(m1+m2+m3+m4+m5)/5

Step 5: iß(i+1), avg1ß(avg*100)

Step 6: if (avg1>90), if not go to step 8

Step 7: Print Grade A, avg, go to step 18

Step 8: if (avg1>80), if not go to step 10

Step 9: Print Grade B, avg, go to step 18

Step 10: if (avg1>70), if not go to step 12

Step 11: Print Grade C, avg, go to step 18

Step 12: if (avg1>60), if not go to step 14

Step 13: Print Grade D, avg, go to step 18

Step 14: if (avg1>50), if not go to step 16

Step 15: Print Grade E, avg, go to step 18

Step 16: if (avg1<=50)

Step 17: Print Grade F, avg

Step 18: Go to step 3

Step 19: Stop

PROGRAM

#include<stdio.h>

#include<conio.h>

void main()

{

    float m1,m2,m3,m4,m5,avg;

    int grade;

    printf("Enter mark of 5 subjects\n");

    scanf("%f%f%f%f%f",&m1,&m2,&m3,&m4,&m5);

    avg=(m1+m2+m3+m4+m5)/3;

    printf("Average = %f\n",avg);

    if(avg>=85)

        grade=1;

    else if(avg>=70)

        grade=2;

    else if(avg>=60)

        grade=3;

    else if(avg>=50)

        grade=4;

    else if(avg>=40)

        grade=5;

    else

        grade=6;

    switch(grade)

    {

    case 1:

        printf("grade is A");

        break;

    case 2:

        printf("grade is B");

        break;

    case 3:

        printf("grade is C");

        break;

    case 4:

 printf("grade is D");

    case 5:

        printf("grade is E");

        break;

    case 6:

        printf("FAIL");

        break;

    }

    getch();

}

ODD OR EVEN NUMBER

AIM

To write a C program to check the given number is odd or even.

ALGORITHM

Step 1: Start

Step 2: Read a

Step 3: if (a%2=0), if not go to step 5

Step 4: Print Given number is even

Step 5: Print Given number is odd

Step 6: Stop

PROGRAM

#include<stdio.h>

#include<conio.h>

void main()

{

int a;

            printf(“Enter a number:”);

            scanf(“%d”,&a);

            if (a%2==0)

                        printf(“\nGiven number is even.”);

            else

                        printf(“\nGiven number is odd.”);

            getch();

}

ROOTS OF A QUADRATIC EQUATION

AIM

To write a C program for finding roots of a quadratic equation

ALGORITHM

Step 1: Start

Step 2: Read values of a,b and c

Step 3: Calculate value of discriminant

            D←b*b-(4*a*c)

Step 4: if D←0

             Root←(-1*b/(2*a))

             Display Root

Step 5: if D>0

             Root1←(-b+√D)/2a

             Root2←(-b-√D)/2a

             Display Root1 and Root2

Step 6: if D<0, Display ‘roots are imaginary’

Step 7: Stop

PROGRAM

#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

    float a,b,c,d,r1,r2;

    printf("Enter the values of a,b,c\n");

    scanf("%f%f%f",&a,&b,&c);

    d=(b*b)-(4*a*c);

    r1=((-1*b)+sqrt(d))/(2*a);

    r2=(-b-sqrt(d))/(2*a);

        printf("Roots are real and distinct:\n%f\n%f",r1,r2);

    }

    else if(d==0)

    {

        r1=-b/(2*a);

        printf("Roots are real and equal:\n%f",r1);

    }

    else

    {

        printf("The roots are imaginary");

    }

    getch();

}

RESULT

The C program for findng the roots of a quadratic equation is completed successfully and the output is verified.

SWAPPING TWO NUMBERS WITHOUT USING TEMPORARY VARIABLE

AIM

To write a C program for swapping two numbers without using temporary variable

ALGORITHM

Step 1: Start

Step 2: Read two numbers a,b

Step 3: a←a+b

Step 4: b←a-b

Step 5: a←a-b

Step 6:Print the numbers a,b

Step 7:Stop

PROGRAM

#include<stdio.h>

#include<conio.h>

void main()

{

    int a,b;

    scanf("%d%d",&a,&b);

    printf("Before swapping\na=%d\nb=%d\n",a,b);

    a=a+b;

    b=a-b;

    a=a-b;

    printf("\nAfter swapping\na=%\nb =%d ",a,b);

    getch();

}

RESULT

The C program for swapping two numbers is completed successfully and the output is verified.

Menu Driven Program To Find Volume Of Sphere And Cube

AIM

To write a menu driven program for finding the volume of a sphere and a cube

ALGORITHM

Step 1:   Start

Step 2:   Print choice sphere ,cube

Step 3:   if cube go to  step 7

Step 4:   read radius r

Step 5:   v←r*r*r*(4/3)*3.14

Step 6:   Print v

Step 7:   read side s

Step 8:   v←s*s*s

Step 9: print v

Step 10: print want to continue?

Step 11: if yes,go to step 1

Step 12: stop

PROGRAM

#include<stdio.h>

#include<conio.h>

void main()

{

    char t,y,Y,n;

    float radius,side,pi;

    int ch;

    pi=3.14;

     do

   {

    printf("\nMENU\n1)volume of sphere\n2)volume of cube\n");

    scanf("%d",&ch);

    switch (ch)

    {

        case 1:

        printf("Enter the value of radius\n");

        scanf("%f",&radius);

        printf("the volume of the sphere=%f cm3",radius*radius*radius*pi*(1.33));

        break;

        case 2:

        printf("\nEnter the value of side\n");

        scanf("%f",&side);

        printf("the volume of the cube=%f cm3",side*side);

        break;

        default:printf("INVALID CHOICE");

        break;

    }

        printf("\n\nDO YOU WANT TO CONTINUE:\nThen press y else n:");

        fflush(stdin);

        scanf("%c",&t);

   }

        while(t=='y'||t=='Y');

        getch();

}

RESULT

The menu driven program for finding the volume of sphere and cube was written , executed and the output  verified successfully.

OUTPUT