C program to print Prime Numbers Between 1 and n

Posted on: 07/08/2012 07/08/2012
Categories: C Programs

/ * c program to print Prime Numbers Between 1 and n * /

#include<stdio.h>
void main()
{
  int num,i=1,j,count;
  //clrscr();
  printf("Enter Num value To Print Prime Numbers between 1 and Num: ");
  scanf("%d",&num);
  printf("Prime Numbers upto %d :\n \n",num);

  while(i<=num)
  {
   count=0;
   for(j=1;j<=i;j++)
   {
    //checking whether num is dvisible by j
    if(i%j==0)
      count++;
   }
   //if num is divisible by 2 numbers,then it is prime
   if(count==2)
      printf("%d ",i);
   i++;
  }
  printf("\n\n");
  //getch(); 
}

#include<stdio.h>

void main()

{

int num,i=1,j,count;

//clrscr();

printf("Enter Num value To Print Prime Numbers between 1 and Num: ");

scanf("%d",&num);

printf("Prime Numbers upto %d :\n \n",num);

while(i<=num)

{

count=0;

for(j=1;j<=i;j++)

{

//checking whether num is dvisible by j

if(i%j==0)

count++;

}

//if num is divisible by 2 numbers,then it is prime

if(count==2)

printf("%d ",i);

i++;

}

printf("\n\n");

//getch();

}

Output: ( using GNU GCC Compiler with code::blocks IDE, hence no need of clrscr(); and getch(); )

Sameer Shaik

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Sameer Shaik

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