Why it doesn't work properly?

Question

This C program takes a number and displays 2 prime numbers which their sum is equal to the number we entered but in the results all the numbers are not prime! Why?

prime1(i) + prime2(j) == n

https://code.sololearn.com/ciC9chJ7340J/?ref=app

Answer 1

Oh.. Use the for loop condition <= instead of < in prine function... ,
Or use

for(i = 3; i <= n/2; i += 2){

Answer 2

Jayakrishna🇮🇳 for example when u enter 20, the results are:

3 17
7 13
9 11

But 9 is not Prime!!!!

Answer 3

Jayakrishna🇮🇳 THANKKKKKK U

Answer 4

Not clear..
'All numbers are not prime'
But am getting primes only...