C语言 string + int 在 C 中的表现是什么？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/19265370/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
What does string + int perform in C?
提问by Abhishek
I can't figure out this expression:
我无法弄清楚这个表达：
str + n
where char str[STRING_LENGTH]and int n.
哪里char str[STRING_LENGTH]和int n。
I have worked a lot in Java and was assuming till now that it's concatenation of string and integer, which I doubt now.
我在 Java 中做了很多工作，并且一直假设它是字符串和整数的连接，我现在对此表示怀疑。
What does it mean?
这是什么意思？
回答by Yu Hao
It's pointer arithmetic. For instance:
这是指针算法。例如：
char* str = "hello";
printf("%s\n", str + 2);
Output: llo. Because str + 2point to 2 elements after str, thus the first l.
输出：llo。因为str + 2指向 2 个元素之后str，因此是第一个l。
回答by Bathsheba
strcan be regarded as pointing to the memory address associated with a character sequence of length STRING_LENGTH. As such, c pointer arithmeticis being exploited in your statement str + n. What is is doing is pointing to the memory address of the nthcharacter in the character sequence.
str可以看作是指向一个长度为STRING_LENGTH的字符序列关联的内存地址。因此，您的语句中正在利用c 指针算法str + n。做的是指向字符序列中n第th个字符的内存地址。
回答by Bijaya Bidari
Yes ans of @Yu Hao and @Bathsheba are correct.
But if you want to do the concatenation, you can go as following code snippet.
@Yu Hao 和 @Bathsheba 的回答是正确的。
但是如果你想进行连接，你可以按照以下代码片段进行操作。
char string[]="hello";
int number=4;
char cated_string[SIZE_CATED_STRING];
sprintf(cated_string,"%s%d",string,number);
printf("%s",cated_string);
Happy Coding.
快乐编码。
