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Write a C++ Program to Display Prime Numbers Between Two Intervals
1.PROGRAM:C++ Program to Display Prime Numbers Between Two Intervals
/* C++ Program to Display Prime Numbers Between Two Intervals*/
#include <iostream>
using namespace std;
int main() {
int low, high, i;
bool is_prime = true;
cout << “Enter two numbers (intervals): “;
cin >> low >> high;
cout << “\nPrime numbers between ” << low << ” and ” << high << ” are: ” << endl;
while (low < high) {
is_prime = true;
// 0 and 1 are not prime numbers
if (low == 0 || low == 1) {
is_prime = false;
}
for (i = 2; i <= low/2; ++i) {
if (low % i == 0) {
is_prime = false;
break;
}
}
if (is_prime)
cout << low << “, “;
++low;
}
return 0;
}
2.PROGRAM:Display Prime Numbers When Larger Number is Entered first
/* Display Prime Numbers When Larger Number is Entered first */
#include <iostream>
using namespace std;
int main() {
int low, high, temp, i;
bool is_prime;
cout << “Enter two numbers (intevals): “;
cin >> low >> high;
//swapping numbers if low is greater than high
if (low > high) {
temp = low;
low = high;
high = temp;
}
cout << “\nPrime numbers between ” << low << ” and ” << high << ” are:” << endl;
while (low < high) {
is_prime = true;
if (low == 0 || low == 1) {
is_prime = false;
}
for (i = 2; i <= low / 2; ++i) {
if (low % i == 0) {
is_prime = false;
break;
}
}
if (is_prime)
cout << low << “, “;
++low;
}
return 0;
}
