Note: EOF The C programming language，
Reading <<The C programming luange>>，a pragram#include <stdio.h>main(){ int c; while((c=getchar())!=EOF) { putchar(c); }}
1. EOF means end of file.
2 .Ctrl+z can end the loop.
3. EOF is an integer, so variable c must be int (char is not enough to hold EOF)
4. the value EOF is -1(VC6.0), but if you input -1,getchar() first get -,then second time get 1
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