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A4
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A4
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Q1 - Write a program to calculate the factorial of a number.
Solution:
#include<iostream>
using namespace std;
int main(){
int n,fact=1;
cin>>n;
for(int i=1;i<=n;i++){
fact*=i;
}
cout<<fact;
}
-----------------------------------------------------------------------------------------
Q2 - Write a program to print all Armstrong numbers between 100 to 500.
Solution:
#include<iostream>
using namespace std;
int main(){
for(int i=0;i<=500;i++){
int sum=0,d,t=i;
while(t!=0){
d=t%10;
sum+=d*d*d;
t=t/10;
}
if(sum==i){
cout<<i<<"\n";
}
}
}
-------------------------------------------------------------------------------------
Q3 - Write a program to find the sum of n natural numbers.
Solution:
#include<iostream>
using namespace std;
int main(){
int n,sum=0;
cin>>n;
for(int i=1;i<=n;i++){
sum+=i;
}
cout<<sum;
}
-----------------------------------------------------------------------------------
Q4 - Write a program to reverse a given integer number.
Solution:
#include<iostream>
using namespace std;
int main(){
int n,d,rev=0;
cin>>n;
while(n>0){
d=n%10;
rev=(rev*10)+d;
n=n/10;
}
cout<<rev;
}
-------------------------------------------------------------------------------
Q5 - Write a program to print the cross pattern given below (in the shape of X):
* *
* *
*
* *
* *
Solution:
#include<iostream>
using namespace std;
int main(){
int n;
cin>>n;
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
if(i==j || i+j==n-1){
cout<<"*";
}
else{
cout<<" ";
}
}
cout<<endl;
}
}
--------------------------------------------------------------------------------
Q6- Write a program to print alphabet diamond pattern:
A
ABC
ABCDE
ABCDEFG
ABCDEFGHI
ABCDEFG
ABCDE
ABC
A
Solution:
#include<iostream>
using namespace std;
int main(){
int n;
cin>>n;
//upside pyramid
for(int i=1;i<=n;i++){
for(int space=1;space<=n-i;space++){
cout<<" ";
}
char ch='A';
for(int j=1;j<=2*i-1;j++){
cout<<ch;
ch++;
}
cout<<endl;
}
//downside pyramid
for(int i=1;i<=n-1;i++){
for(int space=1;space<=i;space++){
cout<<" ";
}
char ch='A';
for(int j=(n-i)*2-1;j>0;j--){
cout<<ch;
ch++;
}
cout<<endl;
}
}
-------------------------------------------------------------------------------
Q7- Write a program to print + pattern given below :
*
*
*****
*
*
Solution:
#include<iostream>
using namespace std;
int main(){
int n;
cin>>n;
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
if(i==n/2){
cout<<"*";
}
else{
if(j==n/2){
cout<<"*";
}
else{
cout<<" ";
}
}
}
cout<<endl;
}
}
---------------------------------------------------------------------------------
Q8 - Write a C++ program to print a triangle of prime numbers upto given number of lines of the triangle.
2
3 5
7 11 13
17 19 23 29
31 37 41 43 47
53 59 61 67 71 73
Solution:
#include<iostream>
using namespace std;
int prime(int num) {
int i, isPrime = 1;
for (i = 2; i <= (num/2); i++) {
if (num % i == 0){
isPrime = 0;
break;
}
}
if (isPrime==1 || num==2)
return 1;
else
return 0;
}
int main(){
int n;
cin>>n;
int count=2;
for(int i=1;i<=n;i++){
for(int j=1;j<=i;j++){
while(!prime(count)){
count++;
}
cout<<count<<" ";
count++;
}
cout<<endl;
}
return 0;
}
--------------------------------------------------------------------------------
Q9- Write a C++ program to check whether a Number can be expressed as a Sum of Two Prime Numbers.
Solution:
#include<iostream>
using namespace std;
int prime(int num) {
int i, isPrime = 1;
for (i = 2; i <= (num/2); i++) {
if (num % i == 0){
isPrime = 0;
break;
}
}
if (isPrime==1 || num==2)
return 1;
else
return 0;
}
int main(){
int n;
bool isPrime=0;
cout<<"Enter a number: ";
cin>>n;
for(int i=2;i<=n/2;i++){
if(prime(i)){
if(prime(n-i)){
cout<<n<<" = "<<i<<" + "<<n-i<<"\n";
isPrime=1;
}
}
}
if(!isPrime){
cout<<"No can't be expressed as sum of two prime number.";
}
}
------------------------------------------------------------------------------------
Q10- Write a C++ program to print a rectangle out of *
Solution:
#include<iostream>
using namespace std;
int main(){
int row,col;
cin>>row>>col;
for(int i=1;i<=row;i++){
for(int j=1;j<=col;j++){
cout<<"* ";
}
cout<<endl;
}
}