C++編譯問題

-1

餵我收到編譯錯誤，我不明白爲什麼C++編譯問題

2智能感知：預期的標識符C：\用戶\肖恩\文檔\ Visual Studio的2013 \項目\ MyString的\的MyString \ mystring.cpp 93 7 mystring
3智能感知：期望a';' c：\ Users \ Sean \ Documents \ Visual Studio 2013 \ Projects \ mystring \ mystring \ mystring.cpp 93 10 mystring
4 IntelliSense：成員函數「main_savitch_4 :: mystring :: operator =」不能在外部重新聲明其類c：\ Users \ Sean \ Documents \ Visual Studio 2013 \ Projects \ mystring \ mystring \ mystring.cpp 106 17 mystring
5智能感知：預期';' c：\ Users \ Sean \ Documents \ Visual Studio 2013 \ Projects \ mystring \ mystring \ mystring.cpp 107 2 mystring

6 IntelliSense：多個操作符「>>」匹配這些操作數： function「operator> >（標準:: istream的&插件，main_savitch_4 :: MyString的&目標）」函數「main_savitch_4 ::運算>>（標準:: istream的&插件，main_savitch_4 :: MyString的&目標）」操作數的類型有：標準:: istream >> main_savitch_4 :: mystring c：\ Users \ Sean \ Documents \ Visual Studio 2013 \ Projects \ mystring \ mystring \ mystring.cpp 246 7 mystring

#include <iostream> 
#include "mystring.h" 
#include <cstring> 
using namespace std; 
using namespace main_savitch_4; 


//Constructors- sets initial values for memeber variables 

    mystring::mystring(const char str[] = "") 

//returns a pointer referencing [0] in an array 
{ 
current_length = 0; 
int pt = 0; 

if (str[pt] != '\0') //this increases the array size to the string size 
{ 
    ++current_length; 
    ++pt; 
} 

sequence = new char[current_length + 1]; 
while (current_length >= pt) 
{ 
    sequence[pt] = str[pt]; 
    ++pt; 
} 
allocated = current_length + 1; 
} 

mystring::mystring(const mystring& source) 
{ 
sequence = new char[source.allocated]; 
current_length = source.current_length; //returns mystring object with same 
allocated = source.allocated;   //length and allocation as source 
for (int i = 0; i <= allocated; ++i) 
{ 
    sequence[i] = source.sequence[i]; //copies characters to new object 
} 

} 

//Destructor- frees space 
mystring::~mystring() 
{ 
     delete[] sequence; 
} 

void mystring::operator +=(const mystring& addend)//adds another string ontop of the original 
{ 

reserve(current_length + addend.current_length + 1); 
strcpy(sequence + current_length, addend.sequence); 
current_length += addend.current_length; 
} 
    void mystring::operator +=(const char addend[]) 
    { 
int leng = current_length + strlen(addend); 
if (leng >= allocated) 
     { 
    reserve(leng + 1); 
} 

strcpy(sequence + current_length, addend); 
current_length = leng; 
} 

void mystring::operator +=(char addend) 
{ 
while (current_length >= allocated) 
{ 
    reserve(current_length + 1); 
} 

sequence[current_length] = addend; 
sequence[current_length + 1] = '\0'; //increases size to allow for \0  character 
++current_length; 

     } 

void mystring::reserve(size_t n) //size_t represents the size of object 
// n is the size 


{ 

    if (allocated < n) 
    { 

    char[] sequence = new char[n]; 
    for (int i = 0; i <= current_length; ++i) 
    { 
     sequence + i; 
     allocated = n; 
    } 

} 


///////////////////// 


void mystring::operator =(const mystring& source) 
{ 

    delete[] sequence; 
    sequence = new char[source.allocated]; 
    allocated = source.allocated; 
    current_length = source.current_length; 

    for (int idx = 0; idx <= source.allocated; ++idx) 
    { 
     sequence[idx] = source.sequence[idx]; 
    } 

} 



char mystring::operator [ ](size_t position) const 

{ 
    return sequence[position]; 
} 


std::ostream& operator <<(std::ostream& outs, const mystring& source) 

{ 
    outs << source.sequence; 

    return outs; 
} 

bool operator ==(const mystring& s1, const mystring& s2) 

{ 
    int length = 0; 
    bool gate = false; 


    if (s1.length() >= s2.length()) 
     length = s1.length(); 
    else 
     length = s2.length(); 

    for (int idx = 0; idx < length; ++idx) 
    { 
     if (s1[idx] - s2[idx] == 0 && idx == length - 1) 
      gate = true; 
    } 

    return gate; 
} 

bool operator !=(const mystring& s1, const mystring& s2) 

{ 
    return !(s1 == s2); 
} 

bool operator >=(const mystring& s1, const mystring& s2) 

{ 
    if (s1 < s2) 
     return false; 
    else 
     return true; 
} 

bool operator <=(const mystring& s1, const mystring& s2) 

{ 
    if (s1 > s2) 
     return false; 
    else 
     return true; 
} 

bool operator > (const mystring& s1, const mystring& s2) 

{ 
    bool gate = false; 
    int length = 0; 

    if (s1.length() <= s2.length()) 
     length = s1.length(); 
    else if (s1.length() > s2.length()) 
     length = s2.length(); 

    for (int idx = 0; idx < length; ++idx) 
    { 
     if (s1[idx] - s2[idx] < 0) 
     { 
      gate = true; 
      idx = length; 
     } 
     else if (idx == length - 1 && s1.length() < s2.length()) 
     { 
      gate = true; 
     } 
    } 

    return gate; 
} 

bool operator < (const mystring& s1, const mystring& s2) 

{ 
    if (s1 != s2 && s2 > s1) 
     return true; 
    return false; 
} 


mystring operator +(const mystring& s1, const mystring& s2) 

{ 
    mystring temp(s1); 
    temp += s2; 
    return temp; 
} 

std::istream& operator >>(std::istream& ins, mystring& target) 

{ 
    while (ins && isspace(ins.peek())) 
    { 
     ins.ignore(); 
    } 

    target = ""; //Clear out any junk in the target 

    while (ins.peek() != '\n') 
     target += ins.get(); 

    return ins; 
} 

std::istream& getline(std::istream& ins, mystring& target) 

{ 
    ins >> target; 

    return ins; 
}

來源

2016-03-03 Sean Gallagher

智能感知錯誤不是編譯器錯誤。發佈實際的編譯器錯誤（以字母「C」開頭的錯誤）。 – PaulMcKenzie

一個好的策略是刪除代碼，直到錯誤停止，然後慢慢開始再次添加代碼。 – TankorSmash

請不要只是將所有代碼轉儲到問題中，而是發佈[mcve]。 –

這如果儲備功能的語句：

void mystring::reserve(size_t n) 
{ 
    if (allocated < n) 
    { 

    char[] sequence = new char[n]; 
    for (int i = 0; i <= current_length; ++i) 
    { 
     sequence + i; 
     allocated = n; 
    } 
}

似乎沒有被關閉。嘗試添加一個}。

來源

2016-03-03 00:37:34 ryan

'char [] sequence = new char [n];'這是否有效的C++？ – PaulMcKenzie

回答

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