C++ Embedded interview questions and answers- Freshers / Experienced

 #include <iostream> using namespace std; template <typename T> class Array { private: T* base; int size; public : Array(T arr[], int length) { base = new T[sizeof(arr)]; size = length; for (int i = 0; i < length; i++) base[i] = arr[i]; } void print(); }; template <typename T> void Array<T>::print() { for (int i = 0; i < size; i++) cout << " " << *(base + i) << endl; } int main() { int arr1[] = {10, 20, 30}; Array<int> obj(arr1, 3); obj.print(); char arr2[] = { 'v', 'a', 'r','u','n' }; Array<char> obj1(arr2, (sizeof(arr2) / sizeof(arr2[0]))); obj1.print(); return 0; }

#include <iostream> #define N 10 // Dynamically Allocate Memory for 1D Array in C++ int main() { // dynamically allocate memory of size N int* A = new int[N]; // assign values to allocated memory for (int i = 0; i < N; i++) A[i] = i + 1; // print the 1D array for (int i = 0; i < N; i++) std::cout << A[i] << " "; // or *(A + i) // deallocate memory delete[] A; return 0; } //2-Dimentional Array. // using single pointer; #include <iostream> // M x N matrix #define M 4 #define N 5 // Dynamically Allocate Memory for 2D Array in C++ int main() { // dynamically allocate memory of size M*N int* A = new int[M * N]; // assign values to allocated memory for (int i = 0; i < M; i++) for (int j = 0; j < N; j++) *(A + i*N + j) = rand() % 100; // print the 2D array for (int i = 0; i < M; i++) { for (int j = 0; j < N; j++) std::cout << *(A + i*N + j) << " ...

class OwnString { private : char *string1 = NULL; int size; public: OwnString(void) { string1 = NULL; } OwnString(const char * strData) { size = strlen(strData); string1  = new char[size + 1]; int i = 0; while (*strData) { string1[i] = *strData; strData++; i++; } } OwnString & operator=(OwnString & obj) { if (this != &obj) { delete[]string1; size = obj.size; string1 = new char[size+1]; int i = 0; while (i<size+1) { string1[i] = obj.string1[i]; //strData++; i++; } } return *this; } OwnString (const OwnString & obj) { if (this != &obj) { delete[]string1; size = obj.size; string1 = new char[size + 1]; int i = 0; while (i < size + 1) { string1[i] = obj.string1[i]; //strData++; i++; } } } void print() { for (int i = 0; i < size; i++) { cout << string1[i]; ...

void getTimeZoneOffset() {     QString UTC_offset;     time_t current_time;     time(&current_time);     QString Daylighsaving ;     struct tm *timeinfo = localtime(&current_time);     double offset = (timeinfo->tm_gmtoff)/60;     if (timeinfo->tm_isdst)     {         offset += 60;         Daylighsaving = "1";     }     if (offset > 0)     {         offset = -offset;     }     else{         offset = -(offset);     }     UTC_offset = QString::number(offset); }

#include <iostream> using namespace std; template <class T> class smart { protected : T *ptr; public : explicit smart(T *data = NULL) { ptr = data; } ~smart() { delete ptr; } T & operator *() { return *ptr; } }; class test { public : test() { cout << "test - constructor " << endl; } ~test() { cout << "test - destroctor " << endl; } }; int main() { smart<int> obj(new int(20)); smart<char> obj2(new char('A')); smart<test> obj3(new test()); cout << *obj << endl; cout << endl; cout << *obj2 << endl; }

#include <iostream> using namespace std; void  primeno(int x) { int k ; for (int i = 2; i < x; i++) { k = 0; for (int j = 1; j <= i; j++) { if (i%j == 0) { k++; } } if (k == 2) { cout << i << " " <<endl; } } } int main() { int primenosize;         std::cout << "prime no \n" <<endl; cout << "input range to print the prime no" <<endl; cin >> primenosize; primeno(primenosize); return 0; }

#include<iostream> #include <pthread.h> using namespace std; void *even(void * size) {             int x = reinterpret_cast<int> (size);         cout << "even no" <<endl;     for(int i = 0; i<x; i++)     {         if(i%2 == 0){                         cout << i << endl;         }             }     cout <<endl;     cout <<"even thread is terminited ";     cout <<endl; } void *odd(void *size ) {     pthread_t tid2;         int x = reinterpret_cast<int> (size);         cout << "odd no" <<endl ; ...