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2023-06-22 16:17:41 深夜i     --     --
C语言 标准输入输出 文件操作 printf scanf

is a header file in the C programming language that provides functions for performing input and output operations in a standard way. It stands for "Standard Input and Output Library" and is similar to the library in C++.

The library includes functions for printing text to the console, reading input from the keyboard, and working with files. Some of the most commonly used functions include printf(), scanf(), and fopen().

The printf() function is used to print formatted text to the console. It can be used to display simple text, as well as to format numbers and other variables. For example, the following code would print "Hello, world!" to the console:



printf("Hello, world!");

The scanf() function is used to read input from the keyboard. It can be used to read simple text, as well as to format and store variables. For example, the following code would read a single integer from the keyboard and store it in the variable "x":



int x;


scanf("%d", &x);

The fopen() function is used to open a file for reading or writing. It takes two arguments: a file name and a mode. The mode specifies whether the file should be opened for reading or writing, and whether it should be created if it does not already exist. For example, the following code would open the file "example.txt" for reading:



FILE *fp;


fp = fopen("example.txt", "r");

Overall, the library is an essential tool for C programmers who need to perform input and output operations. Its functions provide a standardized way of working with text and files, making it easier to write portable and robust software.

  
  

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