Half Up Rounding
Easy
Python
Data Types
18 views
Problem Statement
A decimal number x is provided. Round it to nearest integer (0.5 goes away from zero) and output the integer.
Input Format
First line: A decimal number x
Output Format
• Print one integer: x rounded to nearest integer
• If fractional part is 0.5, round away from zero
• If fractional part is 0.5, round away from zero
Example
-2.5
-3
Constraints
• -10^9 ≤ x ≤ 10^9
Concept Explanation
Input:
x = -2.5
Rule: 0.5 goes away from zero.
• For positive numbers:
2.5 → 3
• For negative numbers:
-2.5 → -3
So output is -3.
x = -2.5
Rule: 0.5 goes away from zero.
• For positive numbers:
2.5 → 3
• For negative numbers:
-2.5 → -3
So output is -3.
Step-by-Step Explanation
1.Read decimal number x as float.
2.If x is positive:
• Add 0.5 and convert to integer.
3.If x is negative:
• Subtract 0.5 and convert to integer.
4.Print the integer result.
2.If x is positive:
• Add 0.5 and convert to integer.
3.If x is negative:
• Subtract 0.5 and convert to integer.
4.Print the integer result.
Concept Explanation
Input:
x = -2.5
Rule: 0.5 goes away from zero.
• For positive numbers:
2.5 → 3
• For negative numbers:
-2.5 → -3
So output is -3.
x = -2.5
Rule: 0.5 goes away from zero.
• For positive numbers:
2.5 → 3
• For negative numbers:
-2.5 → -3
So output is -3.
Step-by-Step Explanation
1.Read decimal number x as float.
2.If x is positive:
• Add 0.5 and convert to integer.
3.If x is negative:
• Subtract 0.5 and convert to integer.
4.Print the integer result.
2.If x is positive:
• Add 0.5 and convert to integer.
3.If x is negative:
• Subtract 0.5 and convert to integer.
4.Print the integer result.
Input / Output Format
Input Format
First line: A decimal number x
Output Format
• Print one integer: x rounded to nearest integer
• If fractional part is 0.5, round away from zero
• If fractional part is 0.5, round away from zero
Constraints
• -10^9 ≤ x ≤ 10^9
Examples
Input:
-2.5
Output:
-3
Example Solution (Public)
import sysnfrom decimal import Decimal,ROUND_HALF_UPns=sys.stdin.read().strip()nif not s: sys.exit(0)nx=Decimal(s)ny=x.quantize(Decimal('1'), rounding=ROUND_HALF_UP)nsys.stdout.write(str(int(y)))
Official Solution Code
import sysnfrom decimal import Decimal,ROUND_HALF_UPns=sys.stdin.read().strip()nif not s: sys.exit(0)nx=Decimal(s)ny=x.quantize(Decimal('1'), rounding=ROUND_HALF_UP)nsys.stdout.write(str(int(y)))
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