how to check if given c++ string or char* contains only digits?

by

Of course, there are many ways to test a string for only numeric characters. Two possible methods are:

bool is_digits(const std::string &str)
{
    return str.find_first_not_of("0123456789") == std::string::npos;
}

or

bool is_digits(const std::string &str)
{
    return std::all_of(str.begin(), str.end(), ::isdigit); // C++11
}

More Related Contents:

  1. Count character occurrences in a string in C++
  2. c++ if specific words from string
  3. What is the type of string literals in C and C++?
  4. Meaning of acronym SSO in the context of std::string
  5. Replace part of a string with another string
  6. What is the lifetime of the result of std::string::c_str()?
  7. No matching function – ifstream open()
  8. Why is strncpy insecure?
  9. Efficient string concatenation in C++
  10. How to remove certain characters from a string in C++?
  11. How do I concatenate multiple C++ strings on one line?
  12. What makes more sense – char* string or char *string? [duplicate]
  13. C/C++: Optimization of pointers to string constants
  14. Why are string literals const?
  15. Why does C++ allow an integer to be assigned to a string?
  16. Proper way to copy C strings
  17. Why are strings in C++ usually terminated with ‘\0’?
  18. Conversion from string literal to char* is deprecated
  19. invalid conversion from ‘const char*’ to ‘char’
  20. String to enum in C++
  21. writing directly to std::string internal buffers
  22. What is the proper function for comparing two C-style strings?
  23. How to read entire stream into a std::string?
  24. Counting the number of occurrences of a string within a string
  25. C++: Can a macro expand “abc” into ‘a’, ‘b’, ‘c’?
  26. Converting bool to text in C++
  27. Do I have to use #include beside ?
  28. Fastest way to Convert String to Binary?
  29. How can CString be passed to format string %s?
  30. How to convert a string of hex values to a string?

Leave a Comment