(Latest Revision: Sun Feb 25 22:38:20 PST 2001 )
copyArt.cpp
copyArt.cpp
/*
This is an example program to show the
student an example of the coding techniques
that might be used to load the contents of
a file into an array, and to copy the
contents of the array back out to the
screen.
*/
#include <fstream.h> //includes iostream.h
#include <assert.h>
#include <string>
const int rowMax = 50 ;
const int colMax = 78 ;
typedef char imageType[rowMax][colMax] ;
/* #################### */
/* loadArt */
/* #################### */
/*
This is a function that opens a file and copies the contents into
a rectangular array called "image".
*/
void loadArt (imageType image)
{ /* start of function loadArt */
char trailChr ;
int row, col ;
string filename = "asciiArt" ;
/* The next statement declares an input file stream
variable "artFile", opens the file "asciiArt", and
binds the open file to the stream variable. Note the
use of the c_str() function to cast the C++ string
into the equivalent C string. */
ifstream artFile(filename.c_str()) ;
// Abort if the previous command failed.
assert(artFile) ;
/* The outer loop goes from row to row in the array --
top to bottom. */
for (row=0; row<rowMax; row++)
{ /* start of outer loop body */
/* The inner loop goes across the current row from
column position 0 on the left to the last column
position on the right. */
/* Precondition of this inner loop: we are ready to
read the first char on a new line in the file. */
for (col=0; col<colMax; col++)
{ /* start of inner loop body */
/* Read the next char on the current line of the
file and copy it into the correct position in
the array. */
image[row][col] = artFile.get() ;
} /* end of inner loop body */
/* We just finished reading a line of the file. Now get
past the '\n' character at the end of the line, so the
precondition will be true for the next repetition of
the inner loop. */
trailChr = artFile.get() ;
} /* end of outer loop body */
} /* end of function loadArt */
/* #################### */
/* writeArt */
/* #################### */
void writeArt (imageType image)
{
int row, col ;
/* Print the image as-is */
/* The outer loop goes from row to row in the array --
top to bottom. */
for (row=0; row<rowMax; row++)
{
/* The inner loop goes across the current row from
column position 0 on the left to the last column
position on the right. */
for (col=0; col<colMax; col++)
cout << image[row][col] ;
/* Now that we have printed one row, move to
the beginning of the next line on the screen. */
cout << endl ;
}
/* For fun: print the image upside down. */
for (row=rowMax-1; row>=0; row--)
{
for (col= colMax-1; col>= 0; col--)
cout << image[row][col] ;
cout << endl ;
}
/* For fun: print the image sideways. */
for (col=0; col<colMax; col++)
{
for (row=0; row<rowMax; row++)
/* Note that we print an extra space
after each element of the array,
trying to improve the "aspect ratiol"
of the display. */
cout << image[row][col] << ' ';
cout << endl ;
}
}
/* #################### */
/* MAIN */
/* #################### */
int main(void)
{ /* main program */
imageType image ;
loadArt (image) ;
writeArt(image) ;
} /* main program */