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UNIT
3
/* 1 Write a program to find sum of N numbers*/
#include <stdio.h>
int main() {
int n, i,
sum = 0;
printf("Enter a positive integer: ");
scanf("%d", &n);
for (i = 1;
i <= n; ++i) {
sum +=
i;
}
printf("Sum = %d", sum);
}
/* 2 Write a program to find factorial of given
number*/
#include<stdio.h>
int main()
{
int
i,fact=1,number;
printf("Enter a number: ");
scanf("%d",&number);
for(i=1;i<=number;i++){
fact=fact*i;
}
printf("Factorial
of %d is: %d",number,fact);
}
/* 3 Write a program to find maximum from given N
inputs by user */
#include <stdio.h>
int main()
{
int
i,num,n,large=0;
printf("How many numbers: ");
scanf("%d",&n);
for(i=0;
i<n; i++)
{
printf("\nEnter
number %d: ",i+1);
scanf("%d",&num);
if(num>large)
large=num;
}
printf("\n\nThe Largest Number is %d",large);
}
/* 4 Write a program to find reverse of a given number
*/
#include<stdio.h>
int main()
{
int n, reverse=0, rem;
printf("Enter a number: ");
scanf("%d", &n);
while(n!=0)
{
rem=n%10;
reverse=reverse*10+rem;
n/=10;
}
printf("Reversed Number: %d",reverse);
}
/* 5 Write a program to find sum of the digits entered
by the user. */
#include<stdio.h>
int main()
{
int
n,sum=0,m;
printf("Enter a number:");
scanf("%d",&n);
while(n>0)
{
m=n%10;
sum=sum+m;
n=n/10;
}
/* 6 Write a program to generate Fibonacci series up
to N numbers */
#include<stdio.h>
int main()
{
int
n1=0,n2=1,n3,i,number;
printf("Enter the number of elements:");
scanf("%d",&number);
printf("\n%d %d",n1,n2);
for(i=2;i<number;++i)
{
n3=n1+n2;
printf(" %d",n3);
n1=n2;
n2=n3;
}
}
}
/* 7 Write a program to find GCD and LCM of given 2
numbers */
#include <stdio.h>
int main()
{
int num1,
num2, gcd, lcm, count = 1, small;
printf("Enter 2 integer numbers\n");
scanf("%d%d",
&num1, &num2);
small =
(num1 < num2) ? num1 : num2;
while(count
<= small)
{
if(num1
% count == 0 && num2 % count == 0)
{
gcd
= count;
}
count++;
}
lcm = ( num1
* num2 ) / gcd;
printf("GCD = %d\nLCM = %d\n", gcd, lcm);
return 0;
}
/* 8 Write a program to find the sum of first 100 odd
nos. and even nos */
#include <stdio.h>
void main()
{
int i, num,
odd_sum = 0, even_sum = 0;
printf("Enter the range\n");
scanf("%d", &num);
for (i = 1;
i <= num; i++)
{
if (i %
2 == 0)
even_sum = even_sum + i;
else
odd_sum = odd_sum + i;
}
printf("Sum
of all odd numbers = %d\n",
odd_sum);
printf("Sum of all even numbers = %d\n", even_sum);
}
/* 9 Write a program to check whether given number by
the user is
Palindrome or not. */
#include <stdio.h>
int main() {
int n,
reversed = 0, remainder, original;
printf("Enter an integer: ");
scanf("%d", &n);
original =
n;
while (n !=
0) {
remainder = n % 10;
reversed
= reversed * 10 + remainder;
n /= 10;
}
if (original
== reversed)
printf("%d is a palindrome.", original);
else
printf("%d is not a palindrome.", original);
return 0;
}
/* 10 Write a program to check whether the given
number is Prime or not */
#include <stdio.h>
int main() {
int n, i, flag
= 0;
printf("Enter a positive integer: ");
scanf("%d", &n);
if (n == 0 ||
n == 1)
flag = 1;
for (i = 2; i
<= n / 2; ++i) {
if (n % i ==
0) {
flag = 1;
break;
}
}
if (flag == 0)
printf("%d is a prime number.", n);
else
printf("%d is not a prime number.", n);
return 0;
}
/* 11 Write a program to print all the prime numbers
ranging from 50 to
100. */
#include <stdio.h>
int main()
{
int i, a = 50,
count;
while(a <=
100)
{
count = 0;
i = 2;
while(i
<= a/2)
{
if(a%i ==
0)
{
count++;
break;
}
i++;
}
if(count ==
0 && a != 1 )
{
printf("
%d ", a);
}
a++;
}
return 0;
}
/* 12 Write a C program to find x1+x2+x3+x4+ ….+xn. */
#include<stdio.h>
#include<math.h>
void main()
{
int
i,n,x,ans;
printf("\n enter last number : ");
scanf("%d",&n);
printf("\n enter value of x : ");
scanf("%d",&x);
for(i=1;i<=n;i++)
{
ans=pow(x,i);
printf("\n%d",ans);
}
}
/* 13 Write a C program to find 1+1/2+1/3+1/4+ …+1/n.
*/
#include<stdio.h>
int main()
{
int
num,i,sum=0;
printf("Input any number: ");
scanf("%d",&num);
printf("1 + ");
for(i=2;i<=num-1;i++)
printf(" 1/%d +",i);
for(i=1;i<=num;i++)
sum =
sum + i;
printf(" 1/%d",num);
printf("\nSum = 1/%d",sum+1/num);
return 0;
}
/* 14 Write a program to print following pyramid.
*
* *
* * *
* * * *
*/
#include <stdio.h>
int main()
{
int i, space,
rows, k = 0;
printf("Enter the number of rows: ");
scanf("%d", &rows);
for (i = 1; i
<= rows; ++i, k = 0) {
for (space
= 1; space <= rows - i; ++space) {
printf(" ");
}
while (k
!= 2 * i - 1) {
printf("* ");
++k;
}
printf("\n");
}
return 0;
}
/* 15 Write a program that accepts an integer N, if the
integer N = 4,
then print the pyramid :
1
121
12321
1234321
*/
#include<stdio.h>
int main()
{
int i,j,row;
printf("Enter number of rows: ");
scanf("%d",&row);
for(i=1;i<=row;i++)
{
for(j=1;j<=row-i;j++)
{
printf(" ");
}
for(j=1;j<=i;j++)
{
printf("%d", j);
}
for(j=i-1;j>=1;j--)
{
printf("%d", j);
}
printf("\n");
}
return 0;
}
/* 16 Write a program that accepts an integer N, if
the integer N =
4,then print the pyramid :
4 4 4 4
3 3 3
2 2
1
*/
#include <stdio.h>
void main()
{
int
i,j,spc,rows,k;
printf("Input number of rows : ");
scanf("%d",&rows);
spc=rows+4-1;
for(i=rows;i>=1;i--)
{
for(k=spc;k>=1;k--)
{
printf(" ");
}
for(j=i;j>=1;j--)
printf("%d ",i);
printf("\n");
spc++;
}
}
/* 17 Write a program to Print following:
A
B C
D E F
G H I J
*/
#include <stdio.h>
int main()
{
int i, space,
rows, k = 0;
char
alphabet='A';
printf("Enter the number of rows: ");
scanf("%d", &rows);
for (i = 1; i
<= rows; ++i, k = 0) {
for (space
= 1; space <= rows - i; ++space) {
printf(" ");
}
while (k
!= 2 * i - 1) {
printf("%c ",alphabet++);
++k;
}
printf("\n");
}
}
/* 18 Write a program to Print following:
1
0 1
1 0 1
0 1 0 1
*/
#include <stdio.h>
int main()
{
int
i,j,rows;
printf("Enter the number of rows: ");
scanf("%d",&rows);
for(i=1;
i<=rows; i++)
{
for(j=1; j<=i; j++)
{
if((i+j)%2==1)
{
printf("0");
}
else
{
printf("1");
}
}
printf("\n");
}
}
/* 19 Write a program to Print following:
1
0 1
0 1 0
1 0 1 0
*/
#include <stdio.h>
int main()
{
int i, j, k,
N;
printf("Enter N: ");
scanf("%d", &N);
k = 1;
for(i=1;
i<=N; i++)
{
for(j=1;
j<=i; j++)
{
if(k
% 2 == 1)
{
printf("1");
}
else
{
printf("0");
}
k++;
}
printf("\n");
}
return 0;
}
/* 20 Write a program to Print following:
A
ABA
ABCBA
ABCDCBA
*/
#include<stdio.h>
int main()
{
int ch=65;
int i,j,k,m;
for(i=1;i<=4;i++)
{
for(j=4;j>=i;j--)
printf(" ");
for(k=1;k<=i;k++)
printf("%c",ch++);
ch--;
for(m=1;m<i;m++)
printf("%c",--ch);
printf("\n");
ch=65;
}
return 0;
}
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