Question

(prime.cpp) A prime number is a number that cannot be formed by multiplying two smaller numbers (not including 1). For example, 2, 3, 5 are prime numbers but 4 (2*2) and 6 (2*3) are not. Write a C++ program that receives the start point and end point from user and displays all the prime numbers in this range. The program also receives how many numbers to display per row. No need to validate. Print the results in a tabular format. Here is a sample run: Enter the start point: 1 Enter the number of prime numbers: 100 Enter how many numbers to display per row: 10 The prime numbers from 1 to 100 are: 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79838997

Answer 1

#include<iostream>
using namespace std;
// Function to check the given number is prime or not
bool isprime(int n)
{
if(n<2) return false;
for(int i=2;i<n;i++)
{
if(n%i==0)
return false;
}
return true;
}
int main()
{
int start,end,t;
cout<<"Enter the start point: ";
cin>>start;
cout<<"Enter the number of prime numbers: ";
cin>>end;
cout<<"Enter how many numbers to display per row: ";
cin>>t;
cout<<"The prime numbers from "<<start<<" to "<<end<<" are: "<<endl;
int k=0; // It is used to change the line after every t element
for(int i=start;i<=end;i++)
{
if(isprime(i))
{
    cout.width(5);
cout<<i<<" ";
k++;
if(k==t)
{
k=0;
cout<<endl;
}
}
}
return 0;
}

main.cpp #include<iostream> 2 using namespace std; 3 // Function to check the given number is prime or not 4 bool isprime(int n) 5-{ if(n<2) return false; for(int i=2;i<n;i++) if(n%i==0) return false; ren return true; 13 } 14 int main() 15 - { int start, end,t; cout<<"Enter the start point: "; cin>>start; cout<<"Enter the number of prime numbers: "; cin>>end; cout<<"Enter how many numbers to display per row: "; cin>>t; cout<<"The prime numbers from "<<start<<" to "<<end<<" are: "<<endl; int k=0; // It is used to change the line after every t element, for(int i=start;i<=end; i++) { if(isprime(i)) cout.width(5); cout<<i<<" "; k++; if(k==t) k=0; cout<<endl; return 0;

Enter the start point: 1 Enter the number of prime numbers: 100 Enter how many numbers to display per row: 10 The prime numbers from 1 to 100 are: 5 11 31 37 41 4347 7379838997 2 13 17 19 23 29 53 Process exited after 4.978 seconds with return value o Press any key to continue ...