Answer / ankur mohan sharma

#include<stdio.h>
#include<conio.h>
int main()
{
int i,n;
for(n=2;n<=20;n++)
{
for(i=2;i<n;i++)
{if(n%i==0)
break;}
}
if(i==n)
printf("\n %d",n);
return 0;

}

Answer / musa

#include <stdio.h>
main(){
printf("2 5 7 11 13 17 19");
}

Answer / ricky dobriyal

/* hello i am ricky dobriyal software enginear*/
#include<stdio.h>
#include<conio.h>
void main()
{
int i,j,s;
printf("prime number 1 to 20 :\n");
for(i=1;i<=20;i++)
{
s=0;
for(j=2;j<i;j++)
{
if(i==1)
s=0;
else if(i%j==0)
s=1;
}
if(s==0)
printf("%d\t",i);
}
getch();
}

output:-1 2 3 4 7 11 13 17 19

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