xstring-Expression: Line: 1682 -string subscript out

 

 

--------------------------- Microsoft Visual C++ Runtime Library --------------------------- Debug Assertion Failed!

 

Program: C:\Windows\SYSTEM32\MSVCP140D.dll File: d:\program files (x86)\microsoft visual studio 14.0\vc\include\xstring Line: 1682

 

Expression: string subscript out of range

 

For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts.

 

(Press Retry to debug the application)

 

--------------------------- 中止(A)   重试(R)   忽略(I)   ---------------------------

//for ( index = 0; index != sizeof(str1); ++index)  //sizeof是查看字节的,写法错误。       for ( index = 0; index != str1.size(); ++index)     {   if (ispunct(str1[index]))    str1_sum += 1;  }

#include 
#include 


int main()
{
	using namespace std;
	string str1;
	int str1_sum(0);
	
	cout