C Program-4

1. /* Write a C program to find the sum of odd numbers and *
* sum of even numbers from 1 to N. Output the computed *
* sums on two different lines with suitable headings */

#include

main()
{
int i, N, oddSum = 0, evenSum = 0;
clrscr();

printf("Enter the value of N\n");
scanf ("%d", &N);

for (i=1; i <=N; i++) { if (i % 2 == 0) evenSum = evenSum + i; else oddSum = oddSum + i; } printf ("Sum of all odd numbers = %d\n", oddSum); printf ("Sum of all even numbers = %d\n", evenSum); } /*----------------------------- Output RUN1 Enter the value of N 10 Sum of all odd numbers = 25 Sum of all even numbers = 30 RUN2 Enter the value of N 50 Sum of all odd numbers = 625 Sum of all even numbers = 650 ------------------------------*/ ***************************************************************** 2. /* Write a C program to reverse a given integer number and check * * whether it is a palindrome. Output the given numbers with suitable* * message */ #include
main()
{
int num, rev = 0, found = 0, temp, digit;
clrscr();
printf("Enter an integer\n");
scanf("%d", &num);

temp = num;
while(num > 0)
{
digit = num % 10;
rev = rev * 10 + digit;
num /= 10;
}
printf("Given number is = %d\n", temp);
printf("Its reverse is = %d\n", rev);

if(temp == rev )
printf("Number is a palindrome\n");
else
printf("Number is not a palindrome\n");
}
/*------------------------
Output
RUN 1
Enter an integer
12321
Given number is = 12321
Its reverse is = 12321
Number is a palindrome

RUN 2
Enter an integer
3456
Given number is = 3456
Its reverse is = 6543
Number is not a palindrome
-----------------------------------*/

****************************************************************

3. /* Write a C program to find the value of sin(x) using the series *
* up to the given accuracy (without using user defined function) *
* Also print sin(x) using library function. */

#include
#include
#include

main()
{
float acc, term, den, x, sinx=0, sinval;
int i, n, x1;
clrscr();

printf("Enter the value of x (in degrees)\n");
scanf("%f",&x);
x1 = x;
/* Degrees to radians*/
x = x*(3.142/180.0);
sinval = sin(x);

printf("Enter the accuary for the result\n");
scanf("%f", &acc);
term = x;
sinx = term;
n = 1;

do
{
den = 2*n*(2*n+1);
term = -term * x * x / den;
sinx = sinx + term;
n = n + 1;
} while(acc <= fabs(sinval - sinx)); printf("Sum of the sine series = %f\n", sinx); printf("Using Library function sin(%d) = %f\n", x1,sin(x)); } /*End of main() */ /*------------------------------ Output Enter the value of x (in degrees) 30 Enter the accuary for the result 0.000001 Sum of the sine series = 0.500059 Using Library function sin(30) = 0.500059 RUN 2 Enter the value of x (in degrees) 45 Enter the accuary for the result 0.0001 Sum of the sine series = 0.707215 Using Library function sin(45) = 0.707179 ---------------------------------------------*/ ******************************************************************************** 4. /* Write a C program to find the value of cos(x) using the series * * up to the given accuracy (without using user defined function) * * Also print cos(x) using library function. */ #include
#include
#include

main()
{
float acc, term, den, x, cosx=0, cosval;
int i, n, x1;
clrscr();

printf("Enter the value of x (in degrees)\n");
scanf("%f",&x);
x1 = x;
/* Degrees to radians*/
x = x*(3.142/180.0);
cosval = cos(x);

printf("Enter the accuary for the result\n");
scanf("%f", &acc);
term = 1;
cosx = term;
n = 1;

do
{
den = 2*n*(2*n-1);
term = -term * x * x / den;
cosx = cosx + term;
n = n + 1;
} while(acc <= fabs(cosval - cosx)); printf("Sum of the cosine series = %f\n", cosx); printf("Using Library function cos(%d) = %f\n", x1,cos(x)); } /*End of main() */ /*------------------------------ Output Enter the value of x (in degrees) 30 Enter the accuary for the result 0.000001 Sum of the cosine series = 0.865991 Using Library function cos(30) = 0.865991 RUN 2 Enter the value of x (in degrees) 45 Enter the accuary for the result 0.0001 Sum of the cosine series = 0.707031 Using Library function cos(45) = 0.707035 ---------------------------------------------*/ **************************************************************************** 5. /* Write a C program to check whether a given number is prime or not * * and output the given number with suitable message */ #include
#include
main()
{
int num, j, flag;
clrscr();

printf("Enter a number\n");
scanf("%d", &num);
if ( num <= 1)
{
printf("%d is not a prime numbers\n", num);
exit(1);
}

flag = 0;
for ( j=2; j<= num/2; j++)
{
if( ( num % j ) == 0)
{
flag = 1;
break;
}
}
if(flag == 0)
printf("%d is a prime number\n",num);
else
printf("%d is not a prime number\n", num);
}
/*------------------------
Output
RUN 1
Enter a number
34
34 is not a prime number

RUN 2
Enter a number
29
29 is a prime number
-----------------------------*/