mismatch() Function in C++

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This C++ program demonstrates the mismatch algorithm. The mismatch algorithm used takes three arguments – the first two arguments are iterators to beginning and end of first container and the third argument is iterator to beginning of second container. The mismatch algorithm returns pair of iterator to the first mismatch of container elements.

Here is the source code of the C++ program demonstrates the mismatch algorithm. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  * C++ Program to demonstrate mismatch() algorithm
  3.  */
  4. #include <iostream>
  5. #include <algorithm>
  6. #include <vector>
  7.  
  8. void fun(int val)
  9. {
  10.     std::cout << val << " ";
  11. }
  12.  
  13. // Print vector routine
  14. void print(std::vector<int> v)
  15. {
  16.     for_each(v.begin(), v.end(), fun);
  17.     std::cout << std::endl;
  18. }
  19.  
  20. int main()
  21. {
  22.     std::vector <int> k(5), l(5);
  23.     typedef std::vector <int>::iterator i;
  24.  
  25.     for (int i = 0; i < k.size(); i++)
  26.     {
  27.         k[i] = i;
  28.         if(i < 3)
  29.             l[i] = i;
  30.     }
  31.     std::pair <i, i> p = mismatch(k.begin(), k.end(), l.begin());
  32.     std::cout << "Vector k : ";
  33.     print(k);
  34.     std::cout << "Vector l : ";
  35.     print(l);
  36.     std::cout << "Mismatched indexes : " << (p.first - k.begin())
  37.               << " " << (p.second - l.begin()) << std::endl;
  38.     std::cout << "Mismatched values  : " << *(p.first)
  39.               << " " << *(p.second) << std::endl;
  40. }

$ a.out
Vector k : 0 1 2 3 4 
Vector l : 0 1 2 0 0 
Mismatched indexes : 3 3
Mismatched values  : 3 0

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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