C++ Program to Calculate Sum of First N Natural Numbers with Explanation
C++
Easy
Control Flow
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1 min read
159 words
This problem helps you practice core C++ fundamentals in a practical way. It builds intuition around sum, page, first. Let’s break it down step by step so you can implement it confidently.
Problem Statement
If N = 5, find sum 1+2+3+4+5 = 15
Real Life: Like adding page numbers from page 1 to page N.
Input Format
An integer N.
Output Format
Sum of numbers from 1 to N.
Constraints
• N ≥ 1
Concept Explanation
The sum is calculated by adding all numbers starting from 1 up to N.
This is similar to adding page numbers from page 1 to page N.
Step-by-Step Logic
1.Take input number N.
2.Initialize sum = 0.
3.Loop from 1 to N:
• Add current number to sum.
4.After the loop, sum contains the total.
5.Print sum.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
void control_q4_sum_n_numbers() {
int n = 10;
int sum = 0;
for(int i = 1; i <= n; i++) {
sum = sum + i;
}
cout << "Sum of first " << n << " numbers: " << sum << endl;
}
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Solution Guide
Problem
If N = 5, find sum 1+2+3+4+5 = 15
Real Life: Like adding page numbers from page 1 to page N.
Input / Output
Output
Sum of numbers from 1 to N.
Explanation
Concept Explanation
The sum is calculated by adding all numbers starting from 1 up to N.
This is similar to adding page numbers from page 1 to page N.
Step-by-Step Explanation
1.Take input number N.
2.Initialize sum = 0.
3.Loop from 1 to N:
• Add current number to sum.
4.After the loop, sum contains the total.
5.Print sum.
Details
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Official Solution
void control_q4_sum_n_numbers() {
int n = 10;
int sum = 0;
for(int i = 1; i <= n; i++) {
sum = sum + i;
}
cout << "Sum of first " << n << " numbers: " << sum << endl;
}
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