Find all Prime Numbers less than N

Write a C Program to Find all Prime Numbers less than N. Here’s simple C Program to Find all Prime Numbers less than N 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 Find all Prime Numbers less than N. 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 Find all Prime Numbers less than N  */

#include<stdio.h>

int main()
{
    int i, prime, lim_up, n;

    printf("\nEnter Limit(N) upto which u want :: ");
    scanf("%d", &lim_up);
    printf("\nPRIME NUMBERS less than [ %d ] are :: \n\n",lim_up);

    for(n=1; n<lim_up; n++)
    {
        prime = 1;
        for(i=2; i<n; i++)
            if(n%i == 0)
            {
                prime = 0;
                break;
            }
        if(prime)
            printf(" %d ",n);
    }

    printf("\n");
    return 0;
}

OUTPUT : :

/* C Program to Find all Prime Numbers less than N  */

Enter Limit(N) upto which u want :: 50

PRIME NUMBERS less than [ 50 ] are ::

 1  2  3  5  7  11  13  17  19  23  29  31  37  41  43  47

Process returned 0

Above is the source code for C Program to Find all Prime Numbers less than N which is successfully compiled and run on Windows System.The Output of the program is shown above .

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