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功能介绍
1. puts()函数用来向标准输出设备屏幕输出字符串并换行。
2. 函数的参数就是一个起始的地址，然后就从这个地址开始一直输出字符串，直到碰到\0就停止，然后这个\0是不进行输出的，是不能够算在里面的。
与此同时，在输出字符串的过程末尾，会追加一个换行符。因此会有换行这个效果。
具体效果
注意点
1. puts()函数包含在头文件<stdio.h>中
2. 可以将字符串直接写入puts()。如：puts("hello world");因为字符串常量的话，本身也代表一个地址，其代表这个字符串第一个字符的地址。
3. puts()只能输出字符串，不能输出数值或者进行格式转换，即不能要求输出格式增加空格、换行（指的是输出内容的中间进行换行）等要求。
4. puts在输出字符串后会自动输出（追加）一个回车符。
5. 你会发现，puts()函数的返回值是0.
再次强调一下，函数返回值与功能是有区别的！
printf()的返回值与功能也是不一样的，printf()函数返回的是打印在屏幕上字符的个数，它的功能是打印相应的内容，返回值与功能是不一样的。
如：
6. puts()的另一种是实现形式
#include <assert.h> int my_puts(const char* str) { assert(str); const char*
tmp = str; int sz = 0; while (*tmp != '\0') { sz++; tmp++; } int i = 0; for (i
= 0; i < sz; i++) { putchar(*(str+i)); } putchar('\n'); return 0; }
