Status matching(SqStack &S,string &exp)
{
int state=1;
int i=0;
SElemType e;
while(i<strlen(exp)&&state)//这里出错。
//
cannot convert parameter 1 from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' to 'const char *'
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
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