# Prime Numbers Between 1-1000

Problem:

Write a C++ program which prints all the prime numbers from 1-1000.

Prime numbers are numbers greater than 1 and which has 1 and the number itself as positive factors or divisors. It doesn't have a positive factor or divisors other than 1 and the number itself.

Let's take 5 for example:

1 and 5 (the number itself) can evenly divide 5 so they are factors of 5.

2, 3, 4 are cannot evenly divide 5 so they are not factors of 5.

Therefore, 5 is a Prime Number.

This is a program which shows the Prime Numbers from 1-1000.

/* Prime Numbers (from 1 - 1000) */ #include <iostream> using namespace std; int main(void) { int num,i,countFactors; char hang; cout << "Prime numbers (1-1000) : " << endl; for (num = 1; num <= 1000; num++) { countFactors = 0; for (i = 2; i <= num; i++) { //if a factor exists from 2 up to the number, count Factors if (num % i == 0) { countFactors++; } } //a prime number has only itself as a factor if (countFactors == 1) { cout << num << ", "; } } //to let console stay cin >> hang; return 0; }

## 6 comments

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Replyhelp number between 1-1000 help tell me answer

ReplyThe prime number distribution sequence can only provide accurate results if multiple counting of equal terms is averted.

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