Write a program that will display all prime numbers from the given range. The program must satisfy the following requirements: a. ask the user of range to display b. contains the following function: i. checkRange() – a functions that checks if the entered range is correct or not. A message will be displayed if the range is invalid. ii. displayPrime() – a function that displays all prime numbers in the given range
NOTE: you will provide the parameter(s) for each function.

here's the code that i made: there is something wrong in my code. I can't pinpoint what is it

#include <iostream>
using namespace std;

int main()
{    
    int Prime, strt, end, result;
    bool isprime=true;
    
    Again:
    cout<<"Start: ";
    cin>>strt;
    
    cout<<"End: ";
    cin>>strt;
    
    cout<<"\n";
    if (strt>end)
    {
        cout<<"Range is Invalid, Try Again."<<"\n";
        goto Again;
    }
    result = Prime(strt,end);
    cout<<"Prime numbers in the given range are: "<<result<<endl;
    return 0;
}

int Prime(int strt, int end, int num, isprime)
{
    int result;
    while (strt<end)
    {
        isprime=true;
        if (strt == 0 || strt == 1) 
        {
            isprime = false;
        }
    for (num = 2; num <= strt/2;   num) 
    {
      if (strt % num == 0) 
      {
        isprime = false;
        break;
      }
    }
        
    if (isprime)
      cout << strt << ", ";
      strt;
    }
    return result;
}

CodePudding user response：

Here is the answer, there are many issues with the code that I won't go through them, ask if you don't understand something

#include <iostream>
using namespace std;

int prime(int strt, int end)
{
    bool isprime;
    int count;
    while (strt<end)
    {
        isprime=true;
        if (strt == 0 || strt == 1)
        {
            isprime = false;
        }
        for (int num = 2; num <= strt/2;   num)
        {
            if (strt % num == 0)
            {
                isprime = false;
                break;
            }
        }

        if (isprime) {
            cout << strt << ", ";
              count;
        }
          strt;
    }
    return 0;
}

int main()
{
    int strt, end, result;

    Again:
    cout<<"Start: ";
    cin>>strt;

    cout<<"End: ";
    cin>>end;

    cout<<"\n";
    if (strt>end)
    {
        cout<<"Range is Invalid, Try Again."<<"\n";
        goto Again;
    }
    cout<<"Prime numbers in the given range are: ";
    prime(strt,end);
    return 0;
}

CodePudding user response：

This is Probably the simplest way I can put it for you.

#include<iostream>
using namespace std;

int check_range(int a,int b)
{
    if (a > b)
    return 0;
    else 
    return 1;
}

int check_prime(int a,int b)
{
    bool isprime;
    while (a < b)
    {
        isprime=true;
        if (a == 0 || a == 1)
        {
            isprime = false;
        }
        for (int i = 2; i <= a/2; i  )
        {
            if (a % i == 0)
            {
                isprime = false;
                break;
            }
        }

        if (isprime) {
            cout <<a<<" ";
        }
        a  ;
    }
        
}

int main()
{   
    int strt,end;
    
    Repeat :
        
    cout<<"Enter the lower limit of range :";
    cin>>strt;
    cout<<"Enter the upper limit of range :";
    cin>>end;
    
    int p = check_range(strt,end);
    
    if (p)
    {
        check_prime(strt,end);
    } 
    else 
    {
        cout<<"The range is inappropriate.\n";
        goto Repeat;
    }
}

Hope you would understand.