Question

a program for first n number of prime numbers

Answer 1

#include<stdio.h>

int main()
{
    printf("\n\n\t\tStudytonight - Best place to learn\n\n\n");
    int n,i = 3, count, c;

    printf("\nEnter the number of prime numbers required :  ");
    scanf("%d", &n);

    if(n >= 1)
    {
        printf("\n\nFirst %d prime numbers are :  ", n);
        printf("2 ");
    }

    // iteration for n prime numbers
    // i is the number to be checked in each iteration starting from 3
    for(count = 2; count <= n; i++)  
    {
        // iteration to check c is prime or not
        for(c = 2; c < i; c++)
        {
            if(i%c == 0)
                break;
        }

        if(c == i)  // c is prime
        {
            printf("%d ", i);
            count++;    // increment the count of prime numbers
        }

    }
    printf("\n\n\n\n\t\t\tCoding is Fun !\n\n\n");
    return 0;
}

Answer 2

#include<stdio.h>

int main()

{int n,i,count=0,j;

printf("enter the no. upto which u want to print");

scanf("%d",&n);

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

{

{

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

{        if(i%j==0)

count++;

}}

if(count==2)

printf("prime no. %d\n",i);

count=0;

}

return 0;

}