Getting filenames from within the program

Copy open_close_string.c into open_close_fgetstr.c and open the following program:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/errno.h>// for errno

int main( void ) {
FILE* inputFile;
FILE* outputFile;

char inputFilename[80] = {0};
char outputFilename[80] = {0};

fprintf( stdout , "Enter name of input file: " );
fscanf(stdin, "%80s" , inputFilename );
inputFile = fopen( inputFilename , "r" );
if( NULL == inputFile ){
fprintf( stderr, "input file: %s: %s\n", inputFilename ,
 strerror( errno ) );
exit( 1 );
}

fprintf( stdout , "Enter name of output file: " );
fscanf(stdin , "%80s" , outputFilename );
outputFile = fopen( outputFilename , "w" );
if( NULL == outputFile ){
fprintf( stderr, "input file: %s: %s\n", 
 outputFilename , strerror( errno ) );
exit( 1 );
}

fprintf( stdout,"\"%s\" opened for reading.\n&quot...