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Program to writes numbers in a file and read and find odd or even numbers from it

 
#include<stdio.h>
#include<conio.h>

void main()
{
    FILE *f1,*f2,*f3;
    int number,i;
    clrscr();

    printf(\"Contents of DATA file\\n\\n\");
    f1 = fopen(\"DATA\",\"w\");  /* create a data file */
    for(i=1;i<=30;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) /* Read from Data file */
    {
        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\\nContents of ODD file \\n\\n\");
    while((number = getw(f2)) != EOF)
        printf(\"%4d\",number);

    printf(\"\\n\\nContents of EVEN file \\n\\n\");
    while((number = getw(f3)) != EOF)
        printf(\"%4d\",number);

    fclose(f2);
    fclose(f3);
    getch();
}

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