Parse int with fallback
Easy
Java
Exceptions
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Problem Statement
Task: parse integer from string; if invalid, return fallback value.
Input Format
• First line: A String s
• Second line: An integer fallback
• Second line: An integer fallback
Output Format
• Print one integer:
• Parsed integer if the string is valid
• Otherwise, fallback value
• Parsed integer if the string is valid
• Otherwise, fallback value
Example
12a3 50
123
Constraints
• -10^9 ≤ parsed integer ≤ 10^9
• -10^9 ≤ fallback ≤ 10^9
• 0 ≤ length of string ≤ 100
• -10^9 ≤ fallback ≤ 10^9
• 0 ≤ length of string ≤ 100
Concept Explanation
The string "12a3" contains a letter (a).
So it is not a valid integer.
Therefore, we return the fallback value.
So it is not a valid integer.
Therefore, we return the fallback value.
Step-by-Step Explanation
• Read string s using Scanner.
• Read integer fallback.
• Use Integer.parseInt(s) inside a try block.
• If parsing is successful, print the parsed value.
• If NumberFormatException occurs, print the fallback value.
• Read integer fallback.
• Use Integer.parseInt(s) inside a try block.
• If parsing is successful, print the parsed value.
• If NumberFormatException occurs, print the fallback value.
Concept Explanation
The string "12a3" contains a letter (a).
So it is not a valid integer.
Therefore, we return the fallback value.
So it is not a valid integer.
Therefore, we return the fallback value.
Step-by-Step Explanation
• Read string s using Scanner.
• Read integer fallback.
• Use Integer.parseInt(s) inside a try block.
• If parsing is successful, print the parsed value.
• If NumberFormatException occurs, print the fallback value.
• Read integer fallback.
• Use Integer.parseInt(s) inside a try block.
• If parsing is successful, print the parsed value.
• If NumberFormatException occurs, print the fallback value.
Input / Output Format
Input Format
• First line: A String s
• Second line: An integer fallback
• Second line: An integer fallback
Output Format
• Print one integer:
• Parsed integer if the string is valid
• Otherwise, fallback value
• Parsed integer if the string is valid
• Otherwise, fallback value
Constraints
• -10^9 ≤ parsed integer ≤ 10^9
• -10^9 ≤ fallback ≤ 10^9
• 0 ≤ length of string ≤ 100
• -10^9 ≤ fallback ≤ 10^9
• 0 ≤ length of string ≤ 100
Examples
Input:
12a3
50
Output:
123
Example Solution (Public)
static int parseOrDefault(String s,int fallback){try{return Integer.parseInt(s);}catch(NumberFormatException e){return fallback;}}
Official Solution Code
static int parseOrDefault(String s,int fallback){try{return Integer.parseInt(s);}catch(NumberFormatException e){return fallback;}}
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