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Now, we need to read data from the file and print it as a table. txt"); /* No error-checking here, but you should be sure to do this in any real * program. */ /* Loop over the lines in the file reading data. */ for(int k = 0; k < NUM_LINES; ++k) { int intValue; double doubleValue; input >> intValue >> doubleValue; } } Next, we need to print out the table row. This is where things get tricky. If you'll recall, the table is supposed to be printed as three columns, each a fixed width, that contain the relevant data.

These extra bytes can quickly add up, and it's actually possible to have on-disk representations of data that are more than twice as large as the data stored in memory. To get around this, C++ streams let you directly write data from memory onto disk without any formatting. All ostreams support a write function that writes unformatted data to a stream, and istreams support read to read unformatted data from a stream into memory. When used well, these functions can cut file loading times and reduce disk space usage.

For(int k = 0; k < COLUMN_WIDTH; ++k) cout << '-'; /* Print a newline... there's nothing else on this line. */ cout << endl; } As written there's nothing wrong with this code and the program will work just fine, but we can simplify the implementation by harnessing stream manipulators. Notice that at two points we need to print out COLUMN_WIDTH copies of the dash character. When printing out the table body, we were able to use the setw stream manipulator to print multiple copies of the space character; is there some way that we can use it here to print out multiple dashes?

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