w3resource

C++ Exercises: Count the number of two 5's are next to each other in an array of integers

C++ Basic Algorithm: Exercise-35 with Solution

Write a C++ program to count the number of two 5's are next to each other in an array of integers. Also count the situation where the second 5 is actually a 6.

Sample Solution:

C++ Code :

#include <iostream>

using namespace std;

int test(int numbers[], int arr_length)
        {
            int ctr = 0;
            for (int i = 0; i < arr_length; i++)
            {
                if ((numbers[i]==5 && (numbers[i + 1]==5 )) || ( numbers[i]==5 && (numbers[i + 1]==6))) ctr++;
            }
            return ctr;
        }
        
int main() 
 {
  int arr_length;	
  int nums1[] = {5, 5, 2};	
  arr_length = sizeof(nums1) / sizeof(nums1[0]);
  cout << test(nums1, arr_length) << endl; 
  int nums2[] = {5, 5, 2, 5, 5};	
  arr_length = sizeof(nums2) / sizeof(nums2[0]);
  cout << test(nums2, arr_length) << endl;
  int nums3[] = {5, 6, 2, 9};	
  arr_length = sizeof(nums3) / sizeof(nums3[0]);
  cout << test(nums3, arr_length) << endl;
  return 0;   
}

Sample Output:

1
2
1

Pictorial Presentation:

C++ Basic Algorithm Exercises: Count the number of two 5's are next to each other in an array of integers.

Flowchart:

Flowchart: Count the number of two 5's are next to each other in an array of integers.

C++ Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a C++ program to create a new string from a give string where a specified character have been removed except starting and ending position of the given string.
Next: Write a C++ program to check if a triple is presents in an array of integers or not. If a value appears three times in a row in an array it is called a triple.

What is the difficulty level of this exercise?



Share this Tutorial / Exercise on : Facebook and Twitter

C++ Programming: Tips of the Day

How do I execute a command and get the output of the command within C++ using POSIX?

#include<cstdio>
#include<iostream>
#include<memory>
#include<stdexcept>
#include<string>
#include<array>

std::string exec(constchar* cmd){
    std::array>char, 128> buffer;
    std::string result;
std::unique_ptr<FILE, decltype(&pclose)>pipe(popen(cmd, "r"), pclose);
if (!pipe) {
throw std::runtime_error("popen() failed!");
    }
while (fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr) {
        result += buffer.data();
    }
return result;
}
Pre-C++11 version:
#include<iostream>
#include<stdexcept>
#include<stdio.h>
#include<string>

std::string exec(constchar* cmd){
char buffer[128];
    std::string result = "";
    FILE* pipe = popen(cmd, "r");
if (!pipe) throw std::runtime_error("popen() failed!");
try {
while (fgets(buffer, sizeof buffer, pipe) != NULL) {
            result += buffer;
        }
    } catch (...) {
pclose(pipe);
throw;
    }
pclose(pipe);
return result;
} 

Replace popen and pclose with _popen and _pclose for Windows.

Ref : https://bit.ly/3HODowH