printing prime numbers

[f2200j]

so basically the program prints the prime numbers for integers from 1 to 100. there should be 10 numbers per line which is fine but when it reaches 113 it skips a bunch of lines before the next line.

#include<iostream>
#include<math.h>
#include<stdio.h>
#include<fstream>

using namespace std;

bool isPrime(int num) {
    for (int i = 2; i <= (sqrt(num)); i++) {
        if (num%i == 0) {
            return false;
        }
    }
    return true;
}

int main() {
    ofstream outfile;       // output file with invalid values
    string outfileName = "prime.txt";
    int num;
    outfile.open("prime.txt");
    while (1) {
        cout << "Enter an integer between 1 and 100: ";
        cin >> num;
        cout << endl;
        cout << "The first " << num << " primes:" << endl;
        outfile << "The first " << num << " primes:" << endl;
        cout << endl;
        if (num >= 1 && num <= 100) {

            int count = 1;
            int i = 2+1;
            while (count < num) {
                if (isPrime(i)) {
                    cout << i << " ";
                    outfile << i << " ";
                    count++;
                }
                if (count % 10 == 0) {
                    cout << endl;
                    outfile << endl;
                }
                i++;
            }
            break;
        }
        else {
            cout << "Invalid value ";
        }
    }
    system("pause");
    return(0);
}

[AbstractionAnon]

Line 39-42: You test count regardless of whether the iteration of the while loop produced a prime number. Move lines 39-42 to after line 37.

[jonnin]

unrelated but consider skipping even numbers in your check, as only 2 is prime of evens.

[f2200j]

that worked. thank you