C++ Programming Code Examples C++ > Mathematics Code Examples Simple Class Program For Find Prime Number In C++ Simple Class Program For Find Prime Number In C++ The C++ programming language allows programmers to separate program-specific data types through the use of classes. Classes define types of data structures and the functions that operate on those data structures. Instances of these data types are known as objects and can contain member variables, constants, member functions, and overloaded operators defined by the programmer. Syntactically, classes are extensions of the C struct, which cannot contain functions or overloaded operators. Prime Number: A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. #include<iostream> #include<conio.h> using namespace std; // Class Declaration class prime { //Member Variable Declaration int a, k, i; public: prime(int x) { a = x; } // Object Creation For Class void calculate() { k = 1; { for (i = 2; i <= a / 2; i++) if (a % i == 0) { k = 0; break; } else { k = 1; } } } void show() { if (k == 1) cout << "\n" << a << " is Prime Number."; else cout << "\n" << a << " is Not Prime Numbers."; } }; //Main Function int main() { int a; cout << "Enter the Number:"; cin>>a; // Object Creation For Class prime obj(a); // Call Member Functions obj.calculate(); obj.show(); getch(); return 0; }