computer programming lab programs

7/25/2019 Computer Programming Lab Programs

1/23

1.Design and develop a flowchart or an algorithm that takes three coefficients (a, b, and c)

of a Quadratic equation (ax2+bx+c=0) as input and compute all possible roots.

Implement a C program for the developed flowchart/algorithm and execute the same tooutput the possible roots for a given set of coefficients with appropriate messages.

#include

#include

int main()

{

float a, b, c, d;

float root1, root2, real, img;

printf("\nEnter the values of a b and c:\t");

scanf("%f%f%f",&a, &b, &c);

if((a == 0)&&(b == 0))

{printf("\nInvalid inputs");

}

else

{

d = (b*b)-(4*a*c);

if(d == 0)

{

printf("\nRoots are real and equal:::");

root1 = root2 = -b/(2*a);

printf("\nRoot1 = %.3f \nRoot2 = %.3f", root1, root2);

}

else if(d > 0)

{

printf("\nRoots are real and distinct:::");

root1 = (-b+sqrt(d))/(2*a);

root2 = (-b-sqrt(d))/(2*a);

printf("\nRoot1 = %.3f \nRoot2 = %.3f", root1, root2);

}

else{

printf("\nRoots are real and imaginary:::");

real = -b/(2*a);

img = (sqrt(fabs(d)))/(2*a);

printf("\nRoot1 = %.3f+i%.3f", real, img);

printf("\nRoot2 = %.3f-i%.3f", real, img);

}

}

}


2/23

Output:1)

Enter the values of a b and c: 1 6 9

Roots are real and equal:::

Root1 = -3.000

Root2 = -3.000

2)

Enter the values of a b and c: 1 -5 3

Roots are real and distinct:::

Root1 = 4.303

Root2 = 0.697

3)

Enter the values of a b and c: 1 4 7

Roots are real and imaginary:::

Root1 = -2.000+i1.732

Root2 = -2.000-i1.732


3/23

2.Design and develop an algorithm to find the reverse of an integer number NUM and

check whether it is PALINDROME or NOT. Implement a C program for the developed

algorithm that takes an integer number as input and output the reverse of the same withsuitable messages.

#include

main()

{

int num, rev=0, rem, n;

printf("\nEnter a number");

scanf("%d", &num);

n = num;

while(num != 0)

{

rem = num%10;

rev = rev*10+rem;num = num/10;

}

printf("\nReversed number is %d", rev);

if(rev == n)

{

printf("\nGiven number is Palindrome");

}

else

{

printf("\nGiven number is not Palindrome ");

}

}

Output:1)

Enter a number: 1221

Reversed number is 1221

Given number is Palindrome

2)

Enter a number: 1234

Reversed number is 4321

Given number is not Palindrome


4/23

3a).Design and develop a flowchart to find the square root of a given number N. Implement

a C program for the same and execute for all possible inputs with appropriate messages.

#include

main()

{

double j;

int i, n;

printf("\nEnter a number:");

scanf("%d", &n);

j = n;

for(i=1; i


5/23

3b). Design and develop a C program to read a year as an input and find whether it is leap

year or not. Also consider end of the centuries.

#include

main()

{

int year;printf("\nEnter valid year:");

scanf("%d", &year);

if(((year%4==0) && (year%100!=0)) | |(year%400==0))

{

printf("\n%d is a leap year", year);

}

else

{

printf("\n%d is not a leap year", year);

}

}

Output:

1)

Enter valid year: 2012

2012 is a leap year

2)

Enter valid year: 2200

2200 is not a leap year


6/23

4.Design and develop algorithm to evaluate polynomial f (x) = a4x4 + a3x3 + a2x2 +a1x +

a0,for a given value of x and its coefficients using Horners method. Implement C program

for the same and execute the program with different set of values of coefficients and x.

#include

main()

{

int n,sum=0, i ,a[50], x;

printf("\nEnter the degree of polynomial:");

scanf("%d", &n);

printf("\nEnter the n+1 coeffients:");

for(i=n; i>=0; i--)

{

scanf("%d", &a[i]);

}

printf("\nEnter value of x:");scanf("%d", &x);

for(i=n; i>=1; i--)

{

sum = x*(sum+a[i]);

}

sum = sum+a[0];

printf("\nSum of given polynomial is %d", sum);

}

Output:

Enter the degree of polynomial: 4

Enter the n+1 coeffients: 1 2 3 4 5

Enter value of x: 2

Sum of given polynomial is 57


7/23

5. Draw the flowchart and Write a C Program to compute Sin(x) using Taylor series

approximation given by Sin(x) = x - (x3/3!) + (x5/5! ) - (x7/7!) + .Compare your result

with the built- in Library function. Print both the results with appropriate messages.

#include

#include

main()

{float degree, x, term, sum, i;

printf("\nEnter the value in degree:");

scanf("%f", &degree);

x = degree*(3.14/180);

sum = 0;

term = x;

i = 1;

do

{

sum = sum+term;

term = ((-1)*term*x*x)/((i+2)*(i+1));

i = i+2;

}while(fabs(term)>=0.000001);

printf("\n Value of sin(%0.2f) is %0.2f", degree, sum);

printf("\n Using library function value of sin(%0.2f) is %0.2f", degree, sin(x));

}

Output:

1)

Enter the value in degree: 45

Value of sin(45.00) is 0.71

Using library function value of sin(45.00) is 0.71

2)

Enter the value in degree: 30

Value of sin(30.00) is 0.50

Using library function value of sin(30.00) is 0.50


8/23

6.Develop an algorithm, implement and execute a C program that reads N integer numbers

and arrange them in ascending order using Bubble Sort.

#include

main()

{

int n, temp, a[50], i, j;

printf("\nEnter number of elements to be taken:");

scanf("%d", &n);

printf("\nEnter elements:");

for(i=0; i


9/23

7. Develop, implement and execute a C program that reads two matricesA (m x n) and B (p

x q ) and Compute product of matrices A and B. Read matrix A and matrix B in row major

order and in column major order respectively. Print both the input matrices and resultant

matrix with suitable headings and output should be in matrix format only. Program must

check the compatibility of orders of the matrices for multiplication. Report an appropriate

message in case of incompatibility.

#include

main()

{

int m, n, p, q, a[50][50], b[50][50], c[50][50], i, j, k;

printf("\nEnter number of rows and columns of Matrix A:");

scanf("%d %d", &m, &n);

printf("\nEnter matrix elements A:");

for(i=0; i


10/23

printf("\nMatrix elements B:\n");

for(i=0; i


11/23

Output:

(1)

Enter number of rows and columns of Matrix A: 2 2

Enter matrix elements A: 1 2 3 4

Enter number of rows and columns of Matrix B: 2 3

Enter matrix elements B: 5 8 6 9 7 10

Matrix elements A:

1 2

3 4

Matrix elements B:

5 6 7

8 9 10

Matrix elements C:

21 24 27

47 54 61

(2)

Enter number of rows and columns of Matrix A: 2 2

Enter matrix elements A: 1 2 3 4

Matrix elements A:

1 2

3 4

Enter number of rows and columns of Matrix B: 3 2

Enter matrix elements B: 1 2 3 4 5 6

Matrix elements B:

1 2

3 4

5 6

Multiplication not possible


12/23

8.Develop, implement and execute a C program to search a Name in a list of names using

Binary searching Technique.

#include

#include

main()

{

int n, i, low, high, mid;char name[100][100], key[100];

printf("\nEnter number of names to be taken:");

scanf("%d", &n);

printf("\nEnter the names in alphabetical order:");

for(i=0; ihigh)

{

printf("\nKey name not found");

}

}

Output:

Enter number of names to be taken: 5

Enter the names in alphabetical order: aaa bcd eef ghi mno

Enter key name to be searched: bcd

Key name is found at pos 2


13/23

9a). Write and execute a C program that, implements string copy operation STRCOPY (str1,

str2) that copies a string str1 to another string str2 without using library function.

#include

void STRCOPY(char s1[], char s2[]);

main()

{char s1[20], s2[20];

printf("\nEnter a string:");

gets(s1);

printf("\nString s1:");

puts(s1);

STRCOPY(s1, s2);

printf("\nString s2:");

puts(s2);

}

void STRCOPY(char s1[], char s2[])

{

int i = 0;

while(s1[i] != '\0')

{

s2[i] = s1[i];

i++;

}

s2[i] = '\0';

}

Output:

Enter a string: hello how are you

String s1: hello how are you

String s2: hello how are you


14/23

9 b)Write and execute a C program that, Read a sentence and print frequency of vowels and

total count of consonants.

#include

#include

#include

main()

{

char s[50], ch;

int ac=0, ec=0, ic=0, oc=0, uc=0, con=0, n, i;

printf("\nEnter a sentence:");

gets(s);

n = strlen(s);

for(i=0; i


15/23

10a. Design and develop a C function RightShift(x ,n) that takes two integers x and n as

input and returns value of the integer x rotated to the right by n positions. Assume the

integers are unsigned. Write a C program that invokes this function with different values for

x and n and tabulate the results with suitable headings.

#include

unsigned RightShift(unsigned int x, unsigned int n);

void main()

{

unsigned int x, n, val;

char ch;

do

{

printf("\nEnter the value: ");

scanf("%u", &x);

printf("\nEnter the number of rotations: ");

scanf("%u", &n);

val=RightShift(x, n);

printf("\nValue is %u", val);

fflush(stdin);

printf("\nDo you want to continue?: ");

ch = getchar();

}while(ch != 'n');

}

unsigned RightShift(unsigned int x, unsigned int n)

{

int i;

for(i=0; i>1;

else

{x = x>>1;

x = x+32768;

}

}

return x;

}


16/23

Output:

Enter the value: 4

Enter the number of rotations: 2

Value is 1

Do you want to continue?: y

Enter the value: 9


Value is 16386


Enter the value: 8


Value is 2


Enter the value: 7


Value is 32771

Do you want to continue?: n


17/23

10 b) Design and develop a C function isprime (num) that accepts an integer argument and

returns 1 if the argument is prime, a 0 otherwise. Write a C program that invokes this

function to generate prime numbers between the given range.

#include

#include

int isprime(int n);

void main()

{

int x, y, i, flag = 0;

printf("\nEnter the range: ");

scanf("%d %d", &x, &y);

for(i=x; i


18/23

11. Draw the flowchart and write a recursive Cfunction to find the factorial of a number, n!,

defined by fact(n)=1, if n=0. Otherwise fact (n) =n*fact (n-1). Using this function, write a C

program to compute the binomial coefficient rnC . Tabulate the results for different values

of n and r with suitable messages.

#include

int fact(int n)

{

if( n == 0 )

return 1;

else

return (n*fact(n-1));

}

void main()

{

int n, r, res;

printf("\nEnter value of n: ");

scanf("%d %d", &n, &r);

res = fact(n)/(fact(n-r)*fact(r));

printf("nCr is = %d", res);

}

Output:

Enter value of n: 4 2

nCr is = 6


19/23

12. Given two university information files studentname.txt and usn.txt that contains

students Name and USN respectively. Write a C program to create a new file called

output.txt and copy the content of filesstudentname.txt and usn.txt into output file in

the sequence shown below. Display the contents of output file output.txt on to the screen.

#include

void main()

{

FILE *fp1, *fp2, *fp3;

char name[50], usn[50];

fp1 = fopen("student.txt", "r");

if(fp1 == NULL)

printf("File1 Not found");

fp2 = fopen("usn.txt", "r");

if(fp2 == NULL)

printf("File2 Not found");

fp3 = fopen("output.txt", "w");

while(!feof(fp1) && !feof(fp2))

{

fscanf(fp1, "%s", name);

fscanf(fp2, "%s", usn);

fprintf(fp3, "\n%s %s", name, usn);

}

fclose(fp1);

fclose(fp2);

fclose(fp3);

fp3 = fopen("output.txt", "r");

printf("-----------------------------\n");

printf("NAME\t\tUSN\n");

printf("-----------------------------\n");

while(!feof(fp3)){

fscanf(fp3, "%s", name);

fscanf(fp3, "%s", usn);

printf("\n%s\t\t%s", name, usn);

}

fclose(fp3);

}

Input files:


20/23

student.txt usn.txt

Output:

-----------------------------

NAME USN

-----------------------------

person1 414CS001

person2 414CS002

person3 414CS003

output.txt

person1

person2

person3

414CS001

414CS002

414CS003

person1 414CS001

person2 414CS002

person3 414CS003


21/23

13. Write a C program to maintain a record of n student details using an array of structures

with four fields (Roll number, Name, Marks, and Grade). Assume appropriate data type for

each field. Print the marks of the student, given the student name as input.

#include

struct student

{

int rollno, marks;

char name[20], grade;

};

void main()

{

struct student s[10];

int n, i, found=0;

char keyname[20];

printf("\nEnter the number of students: ");scanf("%d", &n);

for(i=0; i


22/23

printf("\nMarks of student %s is: %d", s[i].name, s[i].marks);

found = 1;

}

}

if(found == 0)

printf("\nGiven student name not found");

}

Output:

Enter the number of students: 2

Enter the details of student 1

Enter roll num: 11

Enter name: John

Enter marks: 60

Enter grade: a

Enter the details of student 2

Enter roll num: 22

Enter name: Sam

Enter marks: 50

Enter grade: b

Students details are:

Roll No Name Marks Grade

11 John 60 a

22 Sam 50 b

Enter the student name whose mark has to be displayed: John

Marks of student John is: 60


23/23

14.Write a C program using pointers to compute the sum, mean and standard deviation of

all elements stored in an array of n real numbers.

#include

#include

void main()

{float a[40], sum=0, mean, sumvar=0, sd, var, *ptr;

int n, i;

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

scanf("%d", &n);

printf("\nEnter the n array elements:");

for(i=0; i

computer programming lab programs

Documents