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String Contains Only Digits

Certification: Basic Level Accuracy: 100% Submissions: 2 Points: 5

Write a C# program to check if a given string contains only digits (0-9). The function should return "true" if the string contains only digits and "false" otherwise. An empty string should return "false".

Example 1
    
        
  • Input: str = "123456"
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  • Output: true
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  • Explanation:
            
      
                
    • Step 1: Check if the string is null or empty (it's not).
      • 
                
    • Step 2: Iterate through each character in the string "123456".
      • 
                
    • Step 3: Check if each character is a digit between '0' and '9' inclusive.
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    • Step 4: All characters ('1', '2', '3', '4', '5', '6') are digits.
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    • Step 5: Return true since all characters in the string are digits.
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Example 2
    
        
  • Input: str = "12a34"
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  • Output: false
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  • Explanation:
            
      
                
    • Step 1: Check if the string is null or empty (it's not).
      • 
                
    • Step 2: Iterate through each character in the string "12a34".
      • 
                
    • Step 3: Check if each character is a digit between '0' and '9' inclusive.
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    • Step 4: The character 'a' at index 2 is not a digit.
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    • Step 5: Return false immediately since not all characters in the string are digits.
      • 
            
    
        
    •
Constraints
    
        
  • 0 ≤ str.length ≤ 10⁴
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  • str consists of ASCII characters
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  • Time Complexity: O(n)
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  • Space Complexity: O(1)
    •
StringsControl StructuresEYPhillips
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Hint
Solution

Solution Hints

    
  
  • Check each character of the string to determine if it's a digit
    • 
  
  • Use built-in C# functions to simplify the solution
    • 
  
  • Handle edge cases like empty strings
    • 
  
  • Consider using character code comparisons or regex for alternative solutions
    • 
  
  • Return false as soon as a non-digit character is found for optimization
    •

Steps to solve by this approach:

 Step 1: Handle edge case of empty string by returning false.
 Step 2: Iterate through each character of the string.
 Step 3: Check if each character is within the ASCII range of digits ('0' to '9').
 Step 4: Return false immediately upon encountering a non-digit character.
 Step 5: If all characters are digits, return true.

Submitted Code :