Check whether Given Number is Prime or not

Write a C program to Check whether the Given Number is Prime or not. Here’s simple C program to Check whether the Given Number is Prime or not in C Programming Language.

Numbers in C

Normally, when we work with Numbers, we use primitive data types such as int, short, long, float and double, etc. The number data types, their possible values and number ranges have been explained while discussing C Data Types.

Here is source code of the C program to Check whether the Given Number is Prime or not. The C program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.

SOURCE CODE : :

/* C program to Check whether the Given Number is Prime or not  */

#include <stdio.h>

int main()
{
    int tally;
    int number;
    unsigned char flag=0;

    printf("\nEnter any integer number :: ");
    scanf("%d",&number);

    for(tally=2; tally<(number/2); tally++)
    {
        if(number%tally ==0)
        {
            flag=1;
            break;
        }
    }

    if(flag==0)
        printf("\nThe Entered Number [ %d ] is a Prime Number.\n",number);
    else
        printf("\nThe Entered Number [ %d ] is not a Prime Number.\n",number);

    return 0;
}

OUTPUT : :

/* C program to Check whether the Given Number is Prime or not  */

Enter any integer number :: 231

The Entered Number [ 231 ] is not a Prime Number.

Process returned 0

Above is the source code for C program to Check whether the Given Number is Prime or not which is successfully compiled and run on Windows System.The Output of the program is shown above .

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