C Program to check Prime Number

First of all a prime number is a positive integer that is divisible only by 1 and itself. For example: 2. 3, 5, 7, 11, 13, 17 Implementation Using C: #include<stdio.h>
int main()
{
int i, n, flag = 1;
printf("Enter a positive integer: ");
scanf("%d", &n);

for(i = 2; i <= n/2; i++)
{
if(n % i == 0)
{
flag = 0;
break;
}
}
if(n == 1)
printf("1 is neither prime nor composite");
else{
if(flag == 1) }
printf("%d is a prime number", n);
else
printf("%d is not a prime number", n);
}
return 0;
} Output:
Enter a positive integer: 19
19 is a prime number Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Follow Programmers Door for more. #programming #blog #placement_prep

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