# C++ program to Check Number can Express as Sum of Prime Numbers

*Check Number can Express as Sum of Prime Numbers*

Write a C++ program to Check Number can Express as Sum of Prime Numbers. Here’s simple C++ program to Check Number can Express as Sum of Prime Numbers in C++ Programming Language.

*What are Functions ?*

*What are Functions ?*

Function is a block of statements that performs some operations. All C++ programs have at least one function – function called “main()”. This function is entry-point of your program.

A function **declaration** tells the compiler about a function’s name, return type, and parameters. A function **definition** provides the actual body of the function.

**Defining a Function : :**

**Defining a Function : :**

The general form of a C++ function definition is as follows:

return_type Function_Name( list of parameters )

{

//function’s body

}

**return_type :**suggests what the function will return. It can be void, int, char, some pointer or even a class object.**Function_Name :**is the name of the function, using the function name it is called.**Parameters :**are variables to hold values of arguments passed while function is called. A function may or may not contain parameter list.**Function body :**is he part where the code statements are written.

Below is the source code for C++ program to Check Number can Express as Sum of Prime Numbers which is successfully compiled and run on Windows System to produce desired output as shown below :

**SOURCE CODE : :**

**SOURCE CODE : :**

/* C++ program to Check Number can Express as Sum of Prime Numbers */ #include <iostream> using namespace std; bool checkPrime(int n); int main() { int n, i; bool flag = false; cout << "\nEnter any positive integer :: "; cin >> n; cout<<"\n"; for(i = 2; i <= n/2; ++i) { if (checkPrime(i)) { if (checkPrime(n - i)) { cout << n << " = " << i << " + " << n-i << endl; flag = true; } } } if (!flag) cout <<"\nThe Number [ "<< n << " ] can't be expressed as sum of two prime numbers.\n"; return 0; } // Check prime number bool checkPrime(int n) { int i; bool isPrime = true; for(i = 2; i <= n/2; ++i) { if(n % i == 0) { isPrime = false; break; } } return isPrime; }

**OUTPUT : :**

**OUTPUT : :**

/* C++ program to Check Number can Express as Sum of Prime Numbers */ Enter any positive integer :: 1234 1234 = 3 + 1231 1234 = 5 + 1229 1234 = 11 + 1223 1234 = 17 + 1217 1234 = 41 + 1193 1234 = 47 + 1187 1234 = 53 + 1181 1234 = 71 + 1163 1234 = 83 + 1151 1234 = 131 + 1103 1234 = 137 + 1097 1234 = 173 + 1061 1234 = 251 + 983 1234 = 257 + 977 1234 = 263 + 971 1234 = 281 + 953 1234 = 293 + 941 1234 = 347 + 887 1234 = 353 + 881 1234 = 461 + 773 1234 = 491 + 743 1234 = 557 + 677 1234 = 587 + 647 1234 = 593 + 641 1234 = 617 + 617 Process returned 0

Above is the source code for C++ program to Check Number can Express as Sum of Prime Numbers which is successfully compiled and run on Windows System.The Output of the program is shown above .

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