find is number prime

int number;
cin >> number;
if (number == 2) {
	cout << "Prime" << endl;
	return;
}else if(number == 1 || number % 2 == 0){
	cout << "Not prime" << endl;
	return;
}
for (int i = 3; i * i <= number; i+=2) {
	if(number % j == 0){
		cout << "Not prime" << endl;
		return;
	}
}
cout << "Prime" << endl;
return;

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4.13

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Awgiedawgie 440220 points

                                    #include &lt;stdio.h&gt;
int main() {
    int n, i, flag = 0;
    printf(&quot;Enter a positive integer: &quot;);
    scanf(&quot;%d&quot;, &amp;n);

    for (i = 2; i &lt;= n / 2; ++i) {

        // condition for non-prime
        if (n % i == 0) {
            flag = 1;
            break;
        }
    }

    if (n == 1) {
        printf(&quot;1 is neither prime nor composite.&quot;);
    }
    else {
        if (flag == 0)
            printf(&quot;%d is a prime number.&quot;, n);
        else
            printf(&quot;%d is not a prime number.&quot;, n);
    }

    return 0;
}

Thank you! 8

4.13 (8 Votes)

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