c++ - 如何读取字符串中的最后一个字符

Question

我试图打印字符串的最后一个字符，例如 str[]="This is an example"，我尝试用一​​些函数打印“example”的“e”，但没有一个函数像我期望。我知道在代码中写入最后一个字符的位置编号更简单，但就像在 strrchr 函数中一样，代码本身就可以工作。有类似的功能吗？

#include <stdio.h>
#include <string.h>
#include <iostream>
using namespace std;
int main ()
{
    char str[] = "This is an example";
    char * pch;
    pch=strrchr(str,'s');

    cout<<str<<endl;
    cout<<"Last time 's' was found was in position: "<<pch-str+1<<endl;
    cout<<"Last character in this example is "<<str[X];
    return 0;
}

Answer 1

来自 the documentation for strrchr :

The terminating null-character is considered part of the C string. Therefore, it can also be located to retrieve a pointer to the end of a string.

因此，strrchr(str, '\0')[-1] 将具有最后一个字符。请注意，只有当您确定 str 不为空时，这才是安全的。