Lesson 1: Transferring Data with WRITEU

In this lesson, you will create a PV-WAVE program that creates a binary data file containing a 4-by-4 array of floating-point values, and then create a C program that reads and displays that binary data file.

To use PV-WAVE to create a binary data file, do the following:

1.Open a file for output.

OPENW, 1, 'float.dat'

2. Write a 4-by-4 array with each element set equal to its one-dimensional index.

WRITEU, 1, FINDGEN(4, 4)

3. Close the file.

CLOSE, 1

You are now ready to write the C program that reads this binary file.

To create the C program to read and display float.dat, do the following:

1.Write or copy the following C program.

#include <stdio.h>

main()

{
float data[4][4];

FILE *infile;

int i, j;

infile = fopen("float.dat", "r");

(void) fread(data, sizeof(data), 1, infile);

(void) fclose(infile);

for (i=0; i < 4; i++)
{

    for (j=0; j < 4; j++)
    printf("%8.1f", data[i][j]);
    printf("\n");

    }

}

2. Run this program. Your output should look similar to the following:

    0.0     1.0    2.0    3.0    

    4.0     5.0     6.0    7.0    

    8.0    9.0    10.0    11.0   

   12.0   13.0    14.0    15.0