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C++ Exercises: Check if a given number is within 2 of a multiple of 10

C++ Basic Algorithm: Exercise-41 with Solution

Write a C++ program to check if a given number is within 2 of a multiple of 10.

Sample Solution:

C++ Code :

#include <iostream>
 
using namespace std;

bool test(int n)
        {
             return n % 10 <= 2 || n % 10 >= 8;
        }
     
        
int main() 
 {
  cout << test(3) << endl; 
  cout << test(7) << endl; 
  cout << test(8) << endl;
  cout << test(21) << endl;         
  return 0;      
}

Sample Output:

0
0
1
1

Flowchart:

Flowchart: Check if a given number is within 2 of a multiple of 10.

C++ Code Editor:

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Previous: Write a C++ program to check if a given non-negative number is a multiple of 3 or 7, but not both.
Next: Write a C++ program to compute the sum of the two given integers. If one of the given integer value is in the range 10..20 inclusive return 18.

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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