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# break

Causes the execution of the current switch or loop body to terminate. The break statement may only appear in the body of a switch or loop statement.

## Example

In the following example, for Windows platforms, break exits a while loop when an I/O error is detected.

To run the example, copy the file readme.txt from the installation's dat directory to the c drive, or copy another file and change filename.

Copy code

    #include <stdio.h>
        int count, total = 0; char buffer[1000];
        FILE* file_stream;
        char * filename = "c:\\readme.txt";
        if ((file_stream = fopen(filename, "r")) == NULL ) {
            lr_error_message ("Cannot open %s", filename);
            return -1;
        }
    // Read until end of file
        while (!feof(file_stream)) {

    // Read 1000 bytes while maintaining a running count

            count = fread(buffer, sizeof(char), 1000, file_stream);
            lr_output_message ("%3d bytes read", count);

    // Check for file I/O errors
            if (ferror(file_stream)) {
                lr_output_message ("Error reading file %s", filename);
                break;
            }
            total += count; // add up actual bytes read
        }
    // Display final total
        lr_output_message ("Total number of bytes read = %d", total);
    // Close the file stream
        if (fclose(file_stream))
            lr_error_message ("Error closing file %s", filename);

    Example:
                    Output:
    Action.c(19): 1000 bytes read
    Action.c(19): 1000 bytes read
    ...
    Action.c(19): 1000 bytes read
    Action.c(20): 977 read
    Action.c(34): Total number of bytes read = 69977

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