文件名称:exchange
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从键盘输入一个字符串，将其中的小写字母全部转换成大写字母，
然后输出到一个磁盘文件"test.dat"中保存，再从该文件中读出
字符串并显示出来。输入的字符串以"！"结束-Keyboard input from a string, lowercase letters, which are all converted to upper case, and then output to a disk file test.dat saved, and then from the document read out the string and displayed. Enter the string of ! End
然后输出到一个磁盘文件"test.dat"中保存，再从该文件中读出
字符串并显示出来。输入的字符串以"！"结束-Keyboard input from a string, lowercase letters, which are all converted to upper case, and then output to a disk file test.dat saved, and then from the document read out the string and displayed. Enter the string of ! End
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将字符串转换为大写后读入文件.cpp