integer
sum
c
prime numbers
5 years, 3 months ago
#include <stdio.h>
int checkPrime(int n);
int main()
{
int n, i, flag = 0;
printf("Enter a positive integer: ");
scanf("%d", &n);
for(i = 2; i <= n/2; ++i)
{
// condition for i to be a prime number
if (checkPrime(i) == 1)
{
// condition for n-i to be a prime number
if (checkPrime(n-i) == 1)
{
// n = primeNumber1 + primeNumber2
printf("%d = %d + %d\n", n, i, n - i);
flag = 1;
}
}
}
if (flag == 0)
printf("%d cannot be expressed as the sum of two prime numbers.", n);
return 0;
}
// Function to check prime number
int checkPrime(int n)
{
int i, isPrime = 1;
for(i = 2; i <= n/2; ++i)
{
if(n % i == 0)
{
isPrime = 0;
break;
}
}
return isPrime;
}
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