Check The Given Number Is A Prime Number Or Not
Source code :-
#include<stdio.h>
int main()
{
int n,i;
printf("Enter the number: ");
scanf("%d",&n);
if(n<2)
{
printf("\n%d is not a prime number.\n",n);
return 1;
}
for(i=2;i<=n/2;i++)
{
if(n%i==0)
break;
}
if(i>n/2)
printf("\n%d is a prime number.\n",n);
else
printf("\n%d is not a prime number.\n",n);
return 1;
}
Input-Output :-
abhi@hp-15q-laptop:~$ gcc prime_number.c
abhi@hp-15q-laptop:~$ ./a.out
Enter the number: 123
123 is not a prime number.
abhi@hp-15q-laptop:~$ gcc prime_number.c
abhi@hp-15q-laptop:~$ ./a.out
Enter the number: 211
211 is a prime number.
Print All The Prime Number Of The Given Range
Source code :
#include<stdio.h>
int main()
{
int n,i,a,b;
printf("Enter the lower limit of the range: ");
scanf("%d",&a);
printf("\nEnter the upper limit of the range: ");
scanf("%d",&b);
printf("\nPrime numbers are: \n\n");
for(n=a;n<=b;n++)
{
for(i=2;i<=n/2;i++)
{
if(n%i==0)
break;
}
if(i>n/2&&n>1)
printf("%d ",n);
}
return 1;
}
Input-Output :
abhi@hp-15q-laptop:~$ gcc prime_number.c
abhi@hp-15q-laptop:~$ ./a.out
Enter the lower limit of the range: 1
Enter the upper limit of the range: 20
Prime numbers are: 2 3 5 7 9 11 13 17 19
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