C++ Program to Print Number Pattern (1 to N) with Explanation
C++
Easy
Pattern Printing
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1 min read
169 words
This problem helps you practice core C++ fundamentals in a practical way. It builds intuition around pattern, instead, star. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Print numbers instead of stars in pattern.
Real Life: Understanding value printing in patterns.
Input Format
An integer n (number of rows).
Output Format
Centered pyramid pattern printed using numbers.
Constraints
1.n ≥ 1
2.Use loops only
3.Numbers increase then decrease
Concept Explanation
Instead of stars, numbers are printed.
Each row prints numbers increasing from 1, then decreasing back to 1,
while spaces keep the pattern centered.
Step-by-Step Logic
1.Take input n.
2.Loop row i from 1 to n.
3.Print (n - i) spaces.
4.Print numbers from 1 to i (increasing).
5.Print numbers from i-1 down to 1 (decreasing).
6.Move to next line.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
void pattern_q4_number_pattern() {
int n = 5;
for(int i = 1; i <= n; i++) {
for(int j = 1; j <= i; j++) {
cout << i << " ";
}
cout << endl;
}
}
Output Example
Output:
1
121
12321
1234321
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
Print numbers instead of stars in pattern.
Real Life: Understanding value printing in patterns.
Input / Output
Input
An integer n (number of rows).
Output
Centered pyramid pattern printed using numbers.
Constraints
1.n ≥ 1
2.Use loops only
3.Numbers increase then decrease
Examples
Output:
1
121
12321
1234321
Explanation
Concept Explanation
Instead of stars, numbers are printed.
Each row prints numbers increasing from 1, then decreasing back to 1,
while spaces keep the pattern centered.
Step-by-Step Explanation
1.Take input n.
2.Loop row i from 1 to n.
3.Print (n - i) spaces.
4.Print numbers from 1 to i (increasing).
5.Print numbers from i-1 down to 1 (decreasing).
6.Move to next line.
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 pattern_q4_number_pattern() {
int n = 5;
for(int i = 1; i <= n; i++) {
for(int j = 1; j <= i; j++) {
cout << i << " ";
}
cout << endl;
}
}
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