check whether a no is prime or not.

Question Posted / amarendra

3 Answers
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check whether a no is prime or not...

Answer / m.shanmuga sundaram,rjnsoftwar

void main()
{
int primeNo;
int i;
bool isPrime = false;

printf("Enter a number to check prime or not\n");
scanf("%d",&primeNo);

for(i = 2; i <= primeNo / 2; i++)
{
if(primeNo % i == 0)
{
isPrime = true;
break;
}
}

if(isPrime)
printf("The number is a prime number %
d\n",primeNo);
else
printf("The number is not a prime number %
d\n",primeNo);
}

Is This Answer Correct ?

2 Yes

0 No

check whether a no is prime or not...

Answer / paramjeet singh

#include<stdio.h>
#include<conio.h>
void main()
{
clrscr();
int i,c;
printf("enter any number\n");
scanf("%d",&i);
printf("you have entered=%d\n",i);
for(c=2;c<=i-1;c++)
{
if(i%c==0)
printf("this no.is not a prime number");
}
printf("this is prime number");
getch();
}

Is This Answer Correct ?

2 Yes

0 No

check whether a no is prime or not...

Answer / rama

#include<stdio.h>
main()
{
int n,i,r;
clrscr();
printf("Enter the positive integer value");
scanf("%d",&n)
i=2;
step1:
if(i<=sqrt(n))
{
r=n%i;
if(r==0)
{
printf("%d is not a prime",n);
goto end;
}
}
else
{
i++;
goto step1;
}
printf("%d is prime number",n);
end:
printf(" ");
}