C++ arrays store multiple values of the same data type in contiguous memory locations.
1️⃣ Display Marks using Array
📌 Store and display student marks using an array.
#include <iostream>
using namespace std;
int main() {
int marks[5] = {85, 90, 78, 88, 76};
cout << "Student Marks: ";
for (int i = 0; i < 5; i++)
cout << marks[i] << " ";
return 0;
}
🔹 Output
Student Marks: 85 90 78 88 76
2️⃣ Find Largest Number using Array
📌 Find the maximum number in an array.
#include <iostream>
using namespace std;
int main() {
int arr[] = {12, 45, 23, 78, 56};
int n = sizeof(arr) / sizeof(arr[0]);
int max = arr[0];
for (int i = 1; i < n; i++)
if (arr[i] > max)
max = arr[i];
cout << "Largest Number: " << max;
return 0;
}
🔹 Output
Largest Number: 78
3️⃣ Find Second Largest Number using Array
📌 Finding the second largest number in an array.
#include <iostream>
using namespace std;
int main() {
int arr[] = {34, 78, 23, 56, 89};
int n = sizeof(arr) / sizeof(arr[0]);
int largest = arr[0], secondLargest = -1;
for (int i = 1; i < n; i++) {
if (arr[i] > largest) {
secondLargest = largest;
largest = arr[i];
} else if (arr[i] > secondLargest && arr[i] != largest)
secondLargest = arr[i];
}
cout << "Second Largest Number: " << secondLargest;
return 0;
}
🔹 Output
Second Largest Number: 78
4️⃣ Find Second Smallest Number using Array
📌 Finding the second smallest number.
#include <iostream>
using namespace std;
int main() {
int arr[] = {12, 45, 23, 78, 56};
int n = sizeof(arr) / sizeof(arr[0]);
int smallest = arr[0], secondSmallest = INT_MAX;
for (int i = 1; i < n; i++) {
if (arr[i] < smallest) {
secondSmallest = smallest;
smallest = arr[i];
} else if (arr[i] < secondSmallest && arr[i] != smallest)
secondSmallest = arr[i];
}
cout << "Second Smallest Number: " << secondSmallest;
return 0;
}
🔹 Output
Second Smallest Number: 23
5️⃣ Find Smallest Number using Array
📌 Finding the minimum number in an array.
#include <iostream>
using namespace std;
int main() {
int arr[] = {12, 45, 23, 78, 56};
int n = sizeof(arr) / sizeof(arr[0]);
int min = arr[0];
for (int i = 1; i < n; i++)
if (arr[i] < min)
min = arr[i];
cout << "Smallest Number: " << min;
return 0;
}
🔹 Output
Smallest Number: 12
6️⃣ Print Values using Array
📌 Printing values using a loop.
#include <iostream>
using namespace std;
int main() {
int arr[] = {1, 2, 3, 4, 5};
for (int i = 0; i < 5; i++)
cout << arr[i] << " ";
return 0;
}
🔹 Output
1 2 3 4 5
7️⃣ Print Array Values using While Loop
📌 Using a while loop to print array values.
#include <iostream>
using namespace std;
int main() {
int arr[] = {10, 20, 30, 40, 50};
int i = 0;
while (i < 5) {
cout << arr[i] << " ";
i++;
}
return 0;
}
🔹 Output
10 20 30 40 50
8️⃣ Sum of Array Average using Array
📌 Calculating the sum and average of array elements.
#include <iostream>
using namespace std;
int main() {
int arr[] = {10, 20, 30, 40, 50};
int sum = 0, n = 5;
for (int i = 0; i < n; i++)
sum += arr[i];
double avg = sum / (double)n;
cout << "Sum: " << sum << ", Average: " << avg;
return 0;
}
🔹 Output
Sum: 150, Average: 30
9️⃣ Transpose Matrix using Array
📌 Transposing a 2D array (matrix).
#include <iostream>
using namespace std;
int main() {
int matrix[2][3] = {{1, 2, 3}, {4, 5, 6}};
int transpose[3][2];
for (int i = 0; i < 2; i++)
for (int j = 0; j < 3; j++)
transpose[j][i] = matrix[i][j];
cout << "Transpose Matrix:\n";
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 2; j++)
cout << transpose[i][j] << " ";
cout << endl;
}
return 0;
}
🔹 Output
Transpose Matrix:
1 4
2 5
3 6
🔟 Two Dimensional Array Addition
📌 Adding two 2D arrays (matrices).
#include <iostream>
using namespace std;
int main() {
int A[2][2] = {{1, 2}, {3, 4}};
int B[2][2] = {{5, 6}, {7, 8}};
int C[2][2];
for (int i = 0; i < 2; i++)
for (int j = 0; j < 2; j++)
C[i][j] = A[i][j] + B[i][j];
cout << "Matrix Addition:\n";
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++)
cout << C[i][j] << " ";
cout << endl;
}
return 0;
}
🔹 Output
Matrix Addition:
6 8
10 12
📌 Summary
✔ Arrays store multiple values in a single variable.
✔ One-dimensional arrays help store lists of numbers.
✔ Two-dimensional arrays (matrices) help store tabular data.
✔ Use loops (for, while) for easy iteration.
✔ Use nested loops for 2D arrays (matrices).
🚀 Let me know if you need more examples! 🔥
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