Print Diamond Pattern
Hard
C++
Control Flow
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Problem Statement
Print diamond shape using stars.
Real Life: Making decorative patterns.
Real Life: Making decorative patterns.
Input Format
An integer n (number of rows for the upper half).
Output Format
Diamond pattern made of *
Example
4
* *** ***** ******* ***** *** *
Constraints
• n ≥ 1
• Use loops only
• Use loops only
Concept Explanation
A diamond has two parts:
• Upper half (increasing stars)
• Lower half (decreasing stars)
Spaces are used to keep the shape centered.
• Upper half (increasing stars)
• Lower half (decreasing stars)
Spaces are used to keep the shape centered.
Step-by-Step Explanation
1.Take input n.
2.Upper half (rows 1 to n):
• Print (n - i) spaces.
• Print (2*i - 1) stars.
3.Lower half (rows n-1 to 1):
• Print (n - i) spaces.
• Print (2*i - 1) stars.
4.Move to next line after each row.
2.Upper half (rows 1 to n):
• Print (n - i) spaces.
• Print (2*i - 1) stars.
3.Lower half (rows n-1 to 1):
• Print (n - i) spaces.
• Print (2*i - 1) stars.
4.Move to next line after each row.
Concept Explanation
A diamond has two parts:
• Upper half (increasing stars)
• Lower half (decreasing stars)
Spaces are used to keep the shape centered.
• Upper half (increasing stars)
• Lower half (decreasing stars)
Spaces are used to keep the shape centered.
Step-by-Step Explanation
1.Take input n.
2.Upper half (rows 1 to n):
• Print (n - i) spaces.
• Print (2*i - 1) stars.
3.Lower half (rows n-1 to 1):
• Print (n - i) spaces.
• Print (2*i - 1) stars.
4.Move to next line after each row.
2.Upper half (rows 1 to n):
• Print (n - i) spaces.
• Print (2*i - 1) stars.
3.Lower half (rows n-1 to 1):
• Print (n - i) spaces.
• Print (2*i - 1) stars.
4.Move to next line after each row.
Input / Output Format
Input Format
An integer n (number of rows for the upper half).
Output Format
Diamond pattern made of *
Constraints
• n ≥ 1
• Use loops only
• Use loops only
Examples
Input:
4
Output:
*
***
*****
*******
*****
***
*
Example Solution (Public)
void control_q13_diamond_pattern() {
int rows = 5;
// Upper part
for(int i = 1; i <= rows; i++) {
// Print spaces
for(int j = 1; j <= rows - i; j++) {
cout << " ";
}
// Print stars
for(int k = 1; k <= 2*i - 1; k++) {
cout << "*";
}
cout << endl;
}
// Lower part
for(int i = rows - 1; i >= 1; i--) {
// Print spaces
for(int j = 1; j <= rows - i; j++) {
cout << " ";
}
// Print stars
for(int k = 1; k <= 2*i - 1; k++) {
cout << "*";
}
cout << endl;
}
}
Official Solution Code
void control_q13_diamond_pattern() {
int rows = 5;
// Upper part
for(int i = 1; i <= rows; i++) {
// Print spaces
for(int j = 1; j <= rows - i; j++) {
cout << " ";
}
// Print stars
for(int k = 1; k <= 2*i - 1; k++) {
cout << "*";
}
cout << endl;
}
// Lower part
for(int i = rows - 1; i >= 1; i--) {
// Print spaces
for(int j = 1; j <= rows - i; j++) {
cout << " ";
}
// Print stars
for(int k = 1; k <= 2*i - 1; k++) {
cout << "*";
}
cout << endl;
}
}
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