Write a program to print all the prime number, between 1 to 100 in file prime.txt.

Dr. A.P.J. Abdul Kalam Technical University, Lucknow

KCS151 / KCS251 Programming for Problem Solving - Using C Language

Lab Exercises

40. Write a program to print all the prime numbers, between 1 to 100 in file prime.txt.

/*

 File: Prgrm40.c

 Author: Aditya Saini

 Date: Jan 20, 2021

 Description: Program to print all the prime numbers, between 1 to 100 in file prime.txt.

*/

#include <stdio.h>

int main (void)

{

     FILE *f_ptr;

     char path[256];

     int i, j;

     //Input file path

     printf ("Input file path: ");

     fflush (stdin);

     gets (path);

     //Open file

     f_ptr = fopen (path, "w");

     if (f_ptr == NULL)

     {

          printf ("Error! Unable to save file.");

          return 0;

     }

     for (i = 2; i <= 100; i++)

     {

          //Checking if i is prime or not

          for (j = 2; j < i; j++)

               if (i % j == 0)

                    break;

          if (j == i)

               fprintf (f_ptr, "%d ", i);

     }

     //Close file

     fclose (f_ptr);

     return 0;

};