Program to find prime number in C.

Prime number : A prime number is a number whose only factors are 1 and itself. That means there is no whole number that evenly divides the prime number.

Let’s write a program to find prime number in C.

Step 1: Let’s open turbo c and write the following code:

//Add preprocessor file

#include

#include

void main()

{

//declare variable

long int i,n,c=0;

//clear screen

clrscr();

printf(“enter any number : ”);

//Assign value in variable n

scanf(“%li”,&n);

for(i=1;i<=n;i++)

{

if (n%i==0)

{

c++;

}

}

if(c==2)

{

printf(“this is prime number”);

}

else

{

printf(“this is not a prime number “);

getch();

}

Step 2: Now save it by pressing F2 and name it prime.cpp.

Step 3: After save it ,Compile it by pressing ALT+F9 to check errors and correct them.

Step 4: Now run the program by click on Run or by pressing ALT+R and see the output .

Output :

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