# KCS151/KCS251 PPS Lab Exercise Program: 03

## LAB Exercise Program: 03

#### KCS151P/KCS251P

##### LAB 3

Write a program to print the entire prime no between 1 and 300.

Write a program to print out all the Armstrong numbers between 100 and 500.

Write a program to draw the following figures:
3 2 1
2 1
1

*
**
***

Write a program to receive a five-digit no and display as like 24689:
2
4
6
8
9

##### LAB 4

Write a function that returns the sum of all the odd digits of a given positive no entered through the keyboard.

Write a program to print the area of the rectangle using function & return its value to the main function.

Write a program to calculate the factorial for the given number using a function.

Write a program to find the sum of the Fibonacci series using a function.

Write factorial function & use the function to find the sum of series S = 1! + 2! + … + n!

##### LAB 5

Write a program to find the factorial of the given number using recursion.

Write a program to find the sum of digits of a 5 digit number using recursion.

Write a program to calculate the GCD of given numbers using recursion.

Write a program to convert a decimal number into a binary number.

Write a program to convert a binary number into a decimal number.

##### LAB 6

Write a program to delete duplicate element in a list of 10 elements & display it on screen.

Write a program to merge two sorted arrays & no element is repeated during merging.

Write a program to evaluate the addition of diagonal elements of two square matrixes.

Write a program to find the transpose of a given matrix & check whether it is symmetric or not.

Write a program to print the multiplication of two N*N (Square) matrix.

##### LAB 7

Write a program in C to check whether the given string is a palindrome or not.

Write a program to sort the array of characters (String) in alphabetical order like STRING in GINRST.

Write a program to remove all the blank space from the string & print it, also count the no of characters.

Write a program to store the following string “zero”, “one”, … “five”.
Print the no in words, given in figure as 3205.

##### LAB 8

Write a program to compare two given dates. To store a date uses a structure that contains three members namely day, month, and year. If the dates are equal then display message equal otherwise unequal.

Define a structure that can describe a hotel. It should have the member that includes the name, address, grade, room charge, and the number of rooms.
Write a function to print out the hotel of given grade in order of room charges.

Define a structure called cricket with player name, team name, batting average, for 55 players & 5 teams. Print team-wise list contains names of players with their batting average.

##### LAB 9

Write a C program to copy & count the character content of one file, says a.txt to another file b.txt.

Write a program to take 10 integers from a file and write the square of these integers in another file.

Write a program to read numbers from a file and then write all ‘odd’ numbers to file ODD.txt & all ‘even’ to file EVEN.txt.

Write a program to print all the prime numbers, between 1 to 100 in file prime.txt.

Write the following C program using pointer:
a) To sort the list of numbers through the pointer.
b) To reverse the string through the pointer.

##### LAB 10

Write a program to find the largest no among 20 integers array using dynamic memory allocation.

Using Dynamic Memory Allocation, Write a program to find the transpose of the given matrix.

Write a program to find the factorial of the given number using the command line argument.

Write a program to find the sum of digits of a 5 digit number using the command line argument.

## 3. Write a program to determine the roots of a quadratic equation.

				
/*
File: Prgrm03.c
Date: Jan 15, 2021
Description: Program to determine the roots of a quadratic equation.
*/

#include <stdio.h>
#include <math.h>

int main (void)
{
double a, b, c;
double dis;
double root_1, root_2, real, img;

//Input a, b and c for eq. ax2+bx+c = 0.
printf ("For eq. ax^2 + bx + c = 0\n");
printf ("Input a: ");
scanf ("%lf", &a);
printf ("Input b: ");
scanf ("%lf", &b);
printf ("Input c: ");
scanf ("%lf", &c);

//Calculate discriminant = b2-4ac
dis = b * b - 4 * a * c;

//If roots are real and different
if (dis > 0)
{
root_1 = (-b + sqrt (dis)) / (2 * a);
root_2 = (-b - sqrt (dis)) / (2 * a);
printf ("First Root = %.2lf\n", root_1);
printf ("Second Root = %.2lf", root_2);
}

//If roots are real and equal
else if (dis == 0)
{
root_1 = root_2 = -b / (2 * a);
printf ("First Root = Second Root = %.2lf", root_1);
}

//If roots are imaginary
else
{
real = -b / (2 * a);
img = sqrt (-dis) / (2 * a);
printf ("First Root = %.2lf + %.2lfi\n", real, img);
printf ("Second Root = %.2lf - %.2lfi", real, img);
}

return 0;
};



### Try it yourself

#### Sample Input and Output

Stdin Inputs:

1 2 3

Sample Result:

For eq. ax^2 + bx + c = 0
Input a: 1
Input b: 2
Input c: 3
First Root = -1.00 + 1.41i
Second Root = -1.00 – 1.41i