Programme for b/w two prime numbers

vannurbasha · #1 06-Dec-2007, 19:56

i want programe r code b/w two prime numbers
Ex:1 to 19 prime numbers with the code r programe .............

fakepoo · #2 07-Dec-2007, 08:25

I can't really tell what you're asking, but it looks like you want to write a program that inputs 2 numbers and prints every prime number in between them (inclusive). Is that correct? If so, here is a little template for you to start with:

CPP / C++ / C Code:

// This function prints out all of the prime numbers between A and B
void PrintPrimes( int A, int B )
{ int i;

  // Make sure A is less than B 
  if( A > B )
  { // Swap them
    i = A;
    A = B;
    B = i;
  }

  for(i=A;i<=B;i++)
  { if(/* i is a prime number */) printf("%d\n",i);
  }
}

int main()
{ int Num1,Num2;
  
  // Get user input  
  printf("Enter the first number: ");
  scanf("%d",&Num1);
  printf("\nEnter the second number: ");
  scanf("%d",&Num2);

  // Call a function to print the prime numbers in between 
  PrintPrimes( Num1, Num2 );
  
  return 0;
}

Now, all you have to do is write the function that will tell you if an integer is a prime number or not.

vannurbasha · #3 07-Dec-2007, 09:09

CPP / C++ / C Code:

void main()
{
 int i,a,b;
 printf("enter the numbers")
 scanf("%d%d",&a,&b);
 if(a<b)
  {
    for(i=a;i<=b;i++)
    {
      if(a%2==0)
      {
        printf('is not a prime number");
        break;
      }
     a++;
   }
  if(i==a)
   {
     printf("is a prime number");
   }
}

take example as a=1 and b=20 and what's wrong in the programme can you tell please it display the error and tell me the correct code/programme

fakepoo · #4 07-Dec-2007, 09:29

My guess is that the line:

printf('is not a prime number");

is giving you an error. Try replacing it with:

printf("is not a prime number");

Other than that, it probably won't work. If I were you, I would follow the example that I posted. When you break processes down into functions, it makes it a lot easier to debug.

Start by creating a function that returns a boolean as to whether a number is prime or not. Something like:

CPP / C++ / C Code:

// Returns non-zero if prime, zero if not prime
int IsPrime( int N )
{ // You fill in this section. 
}

Then, you should test just this function by itself before putting it in with the rest of the code.

maryam · #5 05-May-2008, 23:53

please send me a complete codo of programme how to display prime numbers from 1 to 20

maryam · #6 05-May-2008, 23:59

#include<iostream>
using namespace std;
void main()
{
int w,x,y,z;
for(x=2;w<=20;x++)
z=0;
{
for(y=2;y<=x-i;y++)
if(x%y==0)
cout<<"z++";
}
if(z==0)
cout<<"x";
}

fakepoo · #7 06-May-2008, 07:34

For another example, see this thread.

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