Day 1: Solved array problem

Aarushi_evenOrOdd_q2.cpp

@@ -0,0 +1,9 @@
+#include<iostream>
+using namespace std;
+
+int main(){
+    int n;
+    cin>>n;
+    n%2==0? cout << "Even" : cout << "Odd";
+    return 0;
+}

Aarushi_positiveOrNegative_q1.cpp

@@ -0,0 +1,14 @@
+#include<iostream>
+using namespace std;
+
+int main(){
+    int n;
+    cin>>n;
+    if(n > 0)
+        cout << "Positive";
+    else if(n < 0)
+        cout << "Negative";
+    else
+        cout << "Zero";
+    return 0;
+}

Aarushi_sumN_1stNaturalnos_q3.cpp

@@ -0,0 +1,14 @@
+#include<iostream>
+using namespace std;
+
+int main(){
+    int n;
+    cin>>n;
+    int i=1;
+    int sum=0;
+    while(i<=n){
+        sum+=i;
+        i++;
+    }
+    cout << sum;
+}

Aarushi_sumOfNNaturalno.s_q4.cpp

@@ -0,0 +1,15 @@
+#include<iostream>
+using namespace std;
+
+int main(){
+    int n;
+    cin>>n;
+    int i=1;
+    int sum=0;
+    sum = n*(n+1)/2;
+    // while(i<=n){
+    //     sum+=i;
+    //     i++;
+    // }
+    cout << sum;
+}

Aarushi_sumOfnosInAGivenRange_q5.cpp

@@ -0,0 +1,16 @@
+#include<iostream>
+using namespace std;
+
+int main(){
+    int n, m;
+    cin>>n >> m;
+
+    int sum = 0;
+    sum = m*(m+1)/2 - n*(n+1)/2 + n;
+    cout<<sum;
+    // int sum=0;
+    // for(int i=n; i<=m; i++){
+    //     sum += i;
+    // }
+    // cout << sum;
+}

DAY 3/Aarushi_LeaporNot_q8.cpp

@@ -0,0 +1,20 @@
+#include<iostream>
+using namespace std;
+
+int main()
+{
+    int year;
+
+    cin>>year;
+
+    if(year % 400 == 0)
+        cout << year << " is a Leap Year";
+
+    else if(year % 4 == 0  && year % 100 != 0)
+        cout << year << " is a Leap Year";
+
+    else
+        cout << year << " is not a Leap Year";
+
+    return 0;
+}

DAY 3/Aarushi_greatestOfThreeNumbres_q7.cpp

@@ -0,0 +1,19 @@
+#include <iostream>
+using namespace std;
+
+int main ()
+{
+    int num1, num2, num3;
+    cin >> num1 >> num2 >> num3;
+
+    if (num1 == num2 && num2 == num3)
+        cout << "all are equal"; 
+    else if (num1 > num2 && num1 > num3)
+        cout << num1 << " is greatest";
+    else if (num2 > num1 && num2 > num3)
+        cout << num2 << " is greatest";
+    else
+        cout << num3 << " is greatest";
+
+    return 0;
+}

DAY 3/Aarushi_greatestOfTwoNumbers_q6.cpp

@@ -0,0 +1,17 @@
+#include <iostream>
+using namespace std;
+
+int main ()
+{
+    int num1, num2;
+    cin>>num1>>num2;
+
+    if (num1 == num2)
+        cout << "both are equal"; 
+    else if (num1 > num2)
+        cout << num1 << " is greater than " << num2;
+    else
+        cout << num2 << " is greater than " << num1;
+
+    return 0;
+}

DAY 3/Aarushi_primeRange_q10.cpp

@@ -0,0 +1,26 @@
+#include <iostream>
+using namespace std;
+
+bool isPrime(int n){
+    if(n < 2)
+        return false;
+
+    for(int i = 2;i < n; i++) 
+    { 
+        if(n % i == 0) 
+            return false;
+    }
+
+    return true;
+}
+
+int main()
+{
+    int a, b;
+    cin>>a>>b;
+
+    for(int i = a; i <= b; i++)
+        if(isPrime(i))
+            cout << i << " ";
+
+}

DAY 3/Aarushi_prime_q9.cpp

@@ -0,0 +1,35 @@
+#include <iostream>
+using namespace std;
+
+bool isPrime(int n) {
+    if (n <= 1) {
+        return false;
+    }
+    if (n == 2) {
+        return true;
+    }
+    if (n % 2 == 0) {
+        return false;
+    }
+
+    for (int i = 2; i <= n; i += 2) {
+        if (n % i == 0) {
+            return false;
+        }
+    }
+
+    return true; 
+}
+
+int main() {
+    int number;
+    cin >> number;
+
+    if (isPrime(number)) {
+        cout << number << " is a prime number." << endl;
+    } else {
+        cout << number << " is not a prime number." << endl;
+    }
+
+    return 0;
+}

DAY 3/Aarushi_reverse_q12.cpp

@@ -0,0 +1,20 @@
+#include <iostream>
+using namespace std;
+
+int main ()
+{
+    int n, rev = 0, r;
+    cin>>n;
+
+    while(n != 0)
+    {
+      r = n % 10;
+      rev = rev * 10 + r;
+      n /= 10;
+    };
+
+    //output
+    cout <<"Reversed Number: "<<rev;
+
+    return 0;
+}

DAY 3/Aarushi_sumOfDigits_q11.cpp

@@ -0,0 +1,17 @@
+#include<iostream>
+using namespace std;
+
+int main()
+{
+    int n;
+    cin>>n;
+    int sum = 0;
+    while(n > 0)
+    {
+        int digit = n % 10;
+        sum+= digit;
+        n = n / 10;
+    }
+    cout<<sum;
+
+}