# 数据输出函数

在C语言中，有三个函数可以用来在显示器上输出数据：

* puts()：只能输出字符串，
* putchar()：只能输出单个字符，本节将会介绍。
* printf()：可以输出各种类型的数据，并且可以进行格式化输出。

printf() 是最灵活、最复杂、最常用的输出函数，完全可以替代 puts() 和 putchar()，一定要掌握。

## putchar()

putchar() 函数只能用来输出单个字符，例如：

```c
#include <stdio.h>
#include <stdlib.h>
int main()
{
    putchar('a');
    putchar(7);
    putchar('\x46');

    system("pause");
    return 0;
}
```

运行程序，输出 aF，同时会听到喇叭发出“嘟”的声音。

## 关于换行

puts() 函数在输出结束时会自动换行，而 printf() 和 putchar() 不会，需要手动添加换行符`\n`。如下所示：

```c
#include <stdio.h>
#include <stdlib.h>
int main()
{
    char *str = "ccc";
    int n = 100;
    char c = 'Z';
    puts(str);
    putchar(c);
    printf("%d", n);
    putchar(c);

    system("pause");
    return 0;
}
```

运行结果：

```
c.biancheng.net
Z100Z请按任意键继续. . .
```


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