(C++) std::strncmp

A Standard function that compares two strings for a desired number of characters. To compare the whole string, use std::strcmp.

Use std::string instead of an array of char [1,2].

include <cassert>

include <cstring>


int main()
{
  const char * const word1 = "ABC";
  const char * const word2 = "ABCD";
  // word1 precedes word2 according to std::stdcmp
  assert(std::strcmp( word1,word2) < 0);
  // word1 is equal to word2
  // according to std::stdncmp
  // because only the first three characters
  // are compared
  assert(std::strncmp(word1,word2,3) == 0);
}

Code links

Reference

1) Bjarne Stroustrup. The C++ Programming Language (3rd edition).ISBN: 0-201-88954-4 Chapter 5.8.5: 'Use string rather then zero-terminated arrays of char'.
2) Herb Sutter and Andrei Alexandrescu. C++ coding standards: 101 rules, guidelines, and best practices. ISBN: 0-32-111358-6. Chapter 77: 'Use vector and string instead of arrays.'

last edited (March 29, 2007) by bilderbikkel, Number of views: 1290, Current Rev: 3 (Diff)

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