Language in C Interview Questions and Answers
Question: How do I write code to find an amount of free disk space available on current drive?
Answer: Use getdfree( ) function as shown in follow code.#include <stdio.h> #include <stdlib.h> #include <dir.h> #include <dos.h> main( ) { int dr ; struct dfree disk ; long freesp ; dr = getdisk( ) ; getdfree ( dr + 1 , &disk ) ; if ( disk.df_sclus == 0xFFFF ) { printf ( "ngetdfree( ) function failedn"); exit ( 1 ) ; } freesp = ( long ) disk.df_avail * ( long ) disk.df_bsec * ( long ) disk.df_sclus ; printf ( "nThe current drive %c: has %ld bytes available as free spacen", 'A' + dr, freesp ) ; } 17. Use of array indices... If we wish to store a character in a char variable ch and the character to be stored depends on the value of another variable say color (of type int), then the code would be as shown below: switch ( color ) { case 0 : ch = 'R' ; break ; case 1 : ch = 'G' ; break ; case 2 : ch = 'B' ; break ; } In place of switch-case we can make use of the value in color as an index for a character array. How to do this is shown in following code snippet. char *str = "RGB' ; char ch ; int color ; // code ch = str[ color ] ; |
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