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2019-10-07 22:50:27 阅读：186 来源： 互联网

标签： use EOF int character printf getchar

Xx_Introduction

Character input and output is by more line character conpose of the text flow
Define name common use capital letter,easy read.
The Standard C Library ----->provide I/O model ------>use character flow way.

Ax_Application

file copy,charater count,line count,word count

Bx_Method

I/O model common use getchar and putchar,interactive use of putchar and printf.

1 getchar()     //read next character
2 putcahr()     //print next character
3 printf()        //print next(bunch) character

File Copy
- file copy version 1
```
 1 #include<stdio.h>
 2 
 3 int main()
 4 {
 5     int c;
 6     
 7     c = getchar();
 8     while(c != EOF){
 9         putchar(c);
10         c = getchar();
11     }
12 }
```
- file copy version 2
```
 1 #include<stdio.h>
 2 
 3 int main()
 4 {
 5     int c;
 6     
 7     while((c = getchar())!= EOF){
 8         putchar(c);
 9     }
10 }
```
  != : unequal to. priority overtop assignment(=) EOF:end of file
- Conclusion:computer use bit storage of character and any data type.
- Assignment can portion of expression.
- Complex statement simple easy read,but so hard understand.
- Due to unequal to relational operator(!=) priority not overtop assignment(=),so c expression use bracket.
```
 1 #include <stdio.h>
 2 
 3 int main()
 4 {
 5     int c;
 6 
 7     while (c = getchar() != EOF){
 8         printf("%d\n",c);
 9     }
10     printf("%d - at EOF\n",c);
11     return 0;
12 }
```
  if not use bracket,will priority operation EOF,value by 1,if input end or else print "c - at EOF".
- Print EOF value programming
```
1 #include <stdio.h>
2 
3 int main()
4 {
5     printf("EOF is %d\n",EOF);
6     return 0;
7 }
```
  character constant EOF is in <stdio.h> file definition,value by -1
- In other system can by definition other value.

Charater Count

标签：,use,EOF,int,character,printf,getchar
来源： https://www.cnblogs.com/enomothem/p/11632748.html

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