20. Sum of Two Integers | Basic I/O

📝 Problem

Get 2 integer inputs and display their sum.

Input Format:
Accept two integers as input

Output Format:
Print the sum as follows:
"Sum of NUM1 and NUM2 is SUM"

Constraints:
1 ≤ N1, N2 ≤ 10^15

Sample Input 1:

78 22

Sample Output 1:

Sum of 78 and 22 is 100

Sample Input 2:

23 45

Sample Output 2:

Sum of 23 and 45 is 68

💡 Key Concepts

What You'll Learn:

Multiple Input Reading: How to read two space-separated integers using cin
Long Long Type: Why use long long for large integers (up to 10^15)
Stream Insertion Chaining: Combining multiple values with << operator
Formatted Output: Creating a complete sentence with variables embedded in text

Why Long Long?

The constraint (up to 10^15) exceeds the range of int (up to ~2×10^9). Using long long ensures we can handle values up to approximately 9×10^18.

How cin Handles Whitespace:

The cin operator automatically skips whitespace (spaces, tabs, newlines) when reading numbers. This means cin >> a >> b works whether the input is "78 22" or "78\n22".

💻 Solution Code

#include <iostream>

using namespace std;

int main() {
    long long a, b;
    cin >> a >> b;
    cout << "Sum of " << a << " and " << b << " is " << a + b;
    return 0;
}