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stl取出字符串中的字符
In C, we know string basically a character array terminated by \0. Thus to operate with the string we define character array. But in C++, the standard library gives us the facility to use the string as a basic data type like an integer. But the string characters can be still accessed considering the string as a character array.
在C语言中,我们知道字符串基本上是一个以\ 0结尾的字符数组。 因此,要对字符串进行操作,我们定义了字符数组。 但是在C ++中,标准库为我们提供了将字符串用作基本数据类型(如整数)的便利。 但是,仍可以将字符串视为字符数组来访问字符串字符。
Example:
例:
Like we define and declare, string s="IncludeHelp"; s[0] = 'I' (not "I") s[7] = 'H' //So same way we can access the string element which is character. //Also there is a function under string class, at(), //which can be used for the same purpose. cout << s.at(7); //prints H
Remember, a string variable (literal) need to be defined under "". 'a' is a character whereas "a" is a string.
请记住,需要在“”下定义一个字符串变量(文字)。 “ a”是字符,而“ a”是字符串。
Note: Trying to accessing character beyond string length results in segmentation fault.
注意:尝试访问超出字符串长度的字符会导致分段错误。
Header file needed:
所需的头文件:
#includeOr #include
C++ program to demonstrate example of accessing characters of a string
C ++程序演示访问字符串字符的示例
#includeusing namespace std;int main(){ string s; cout<<"enter string...\n"; cin>>s; cout<<"Printing all character elements...\n"; for(int i=0;i
Output
输出量
enter string...IncludeHelpPrinting all character elements...I n c l u d e H e l p
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stl取出字符串中的字符
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