Programmator

A file named data contains series of integer numbers. Write a c program to read all numbers from file and then write all odd numbers into file named “odd” and write all even numbers into file named “even”. Display all the contents of these file on screen

In this program we will learn how to create a odd and even file also enter the related data into the particular file.

The c program to give step by step simple example. The file named DATA contains series of integer numbers. Code a program to read these numbers and the write all 'odd' numbers to a file to be called ODD and all 'even' numbers to a file to be called EVEN.

The program is shown below example. It uses three files simultaneously and therefor we need to define three-file pointers f1, f2, f3.

First, the file DATA containing integer values is created. The integer values are read from the terminal and are written to the fil DATA with the help of the statement putw(number, f1);

Notice the when we type we type-1, the reading is terminated and the file is closed. The next step is to open all the three files, DATA for reading, ODD and EVEN for writing. The contents of DATA file are read, integer by integer, by the function getw(f1) and written to ODD or EVEN file after an appropriate test. Note that the statement

(number = getw(f1))!= EOF

reads a value, assign the same to number, and then test for the end-of-file mark.

Finally, the program displays the contents of ODD and EVEN file. It is important to note that file ODD and EVEN opened for writing are closed before are reopened for reading.

Program:

#include<stdio.h>

int main()
{
    FILE *f1,*f2,*f3;
    int number,i, n=10;

    printf("Contents of DATA file\n\n");

    f1 = fopen("DATA","w");
  
    for(i=0;i<n;i++)
    {
        scanf("%d",&number);
        if(number==-1)
        {
              break;
        }
        putw(number,f1);
    }
    fclose(f1);

    f1 = fopen("DATA","r");
    f2 = fopen("ODD","w");
    f3 = fopen("EVEN","w");

    while((number = getw(f1)) != EOF)
    {
        if(number%2==0)
   {
    putw(number,f3);
   }
        else
   {
    putw(number,f2);
   }
    }

    fclose(f1);
    fclose(f2);
    fclose(f3);

    f2 = fopen("ODD","r");
    f3 = fopen("EVEN","r");

    printf("\n\n Contents of ODD file \n\n");

    while((number = getw(f2)) != EOF)
  {
   printf("%d ",number);
  }


    printf("\n\nContents of EVEN file \n\n");

    while((number = getw(f3)) != EOF)
  {
   printf("%d ",number);
  }

    fclose(f2);
    fclose(f3);
    return 0;
}

Output:

Contents of DATA file

11 22 33 44 55 66 77 88 99 00 12 34 56 78 90 -1


 Contents of ODD file

11 33 55 77 99

Contents of EVEN file

22 44 66 88 0

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Program:

#include<stdio.h>
#include<stdlib.h>

int main() 
{
    char str[50],ch[50];
    FILE *fp;
 
    printf("Enter String : ");
    scanf("%[^\n]s",str);
 
    fp = fopen("Test.txt","w");
    fputs(str,fp);
    fclose(fp);
 
    fp = fopen("Test.txt","r");
    fgets(ch,50,fp);
    fclose(fp);
 
    printf("\nString from File : %s",ch);
    return 0;
}

Output:

Enter String : C Programming is fun

String from File : C Programming is fun

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