上节讲了关于数据输入函数，这节就来讲讲数据输出函数
深入了解C语言：数据输入函数的使用方法及注意事项
数据输出函数
将程序里变量或者数组之中的数据, 依照指定格式, 输出至屏幕、文件、网络等外部目的地的函数, 被称作数据输出函数。C语言里常用的数据输出函数存在以下几种:
函数
这个函数, 它的作用是, 朝着标准输出, 也就是通常所说的屏幕, 进行格式化数据的输出, 并且, 依据指定的格式符, 把数据转变为相宜的类型以及格式。
函数的一般形式为：(格式字符串, 变量列表);
当中, 格式字符串是个由格式符和普通字符构成的字符串, 用以指明输出数据的类型跟格式, 变量列表是项由变量或者数组元素组成的列表, 则是用来指定输出数据的究竟源于何处, 比如:
int a = 10, b = 20;
以格式化的形式, 将变量a, 变量b, 变量a与变量b相加的结果, 还有换行符, 输出到屏幕上 , 格式形如("%d + %d = %d\\n")。
注意：
在函数里面, 除去了X、E、G之外, 别的格式字符都一定要用小写字母, 比如说%d是不可以写成%D的。
函数：
这个函数主要是用于实现朝着标准输出去输出一个字符的操作, 在运用这个函数期间务必要增添头文件stdio.h。
函数的一般形式为：(字符);
那当中, 字符属于一种字符格式的常量情形或者为可变状态之物, 它旨在用以明确指出所要输出的字符是怎样的, 就如同这样举例说:
函数一次仅能输出单个字符, 若要输出多个字符, 那就得多次调用函数。字符画输出完毕后, 借助函数输出转义字符“\\n”, 来开展一次换行的操作。
puts函数：
该函数用以朝着标准输出去输出一个字符串, 而且会自动予以添加一个换行符。在运用puts函数之际, 是需要添加头文件stdio.h的。
puts函数的一般形式为：puts(字符串);
当中, 那个字符串属于一个字符串常量或者字符数组一类, 被用以指明输出的那个字符串。举例来说:
put函数于字符串里判别“\\0”结束符, 碰到结束符之际, 后续的字符不会再输出, 且会主动换行。Csdn.duck.inK/POST/sX4q7Z.Doc
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