3)Write a C program to read data from the keyboard , write it to a input file again read the same data from file and display it on screen.

source file name: Readfile.C

 #include<stdio.h>

int  main()

{

int n;

char ch;

FILE *fp;

//clrscr();

fp=fopen("input.txt","w");

printf("\n enter information for file:\n ");

while((ch=fgetc(stdin))!=EOF)

{

fprintf(fp, "%c",ch);

}

fclose(fp);

printf("\n reads data from same file & display on screen :\n");

fp=fopen("input.txt","r");

while((ch=fgetc(fp))!=EOF)

{

printf( "%c",ch);

}

fclose(fp);

//getch();

return 0;

}

output: