Write a C program that takes a positive integer n as input and prints all the prime numbers from 1 to n.
Sample Input/Output 1: Enter your n: 20 Prime number(s) from 1 to 20 :
2
3
5
7
11
13
17
19
Sample Input/Output 2: Enter your n:2Prime number(s) from 1 to 2 :
2
#include<stdio.h>
#include<conio.h>
int main()
{
int b,r,i,a=1,n;
printf("enter your n:");
scanf("%d",&n);
printf("prime numbers from 1 to %d:",n);
for(b=a;b<=n;b++)
{
r=1;
for(i=2;i<=b/2;i++)
{
r=b%i;
if(r==0)
break;
}
if(r!=0&&b>1)
printf(" \n%d",b);
}
}
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