小编Dan*_*ore的帖子

你好noob程序员在这里遇到strcmp问题这是我的代码.

while (strcmp("m",wood) !=0 || strcmp("j",wood) !=0 || strcmp("o",wood) !=0){
    cout << "(m for mahogany, o for oak, or p for pine): ";
cin >> wood;
}

这是我的错误.

• dining.cpp:在成员函数'void DiningSet :: woodType()'中:
• dining.cpp:76:24:错误:从'char'无效转换为'const char*'[-fpermissive] /usr/include/string.h:143:12:错误:初始化'int strcmp(const)的参数2 char*,const char*)'[-fpermissive]
• dining.cpp:76:48:错误:从'char'无效转换为'const char*'[-fpermissive] /usr/include/string.h:143:12:错误:初始化'int strcmp(const)的参数2 char*,const char*)'[-fpermissive]
• dining.cpp:76:72:错误:从'char'无效转换为'const char*'[-fpermissive] /usr/include/string.h:143:12:错误:初始化'int strcmp(const)的参数2 char*,const char*)'[-fpermissive]

您好,这是我的代码段,我正在尝试实现Morris-Pratt算法.当我比较我的变量时,如果发现它们不匹配,这是因为我的一个变量"Temp"正在将额外的字符添加到数组的末尾.这是我的代码......

        // Calculate the next talbe
        char test[searchLen];

        for(int i = 0; i < searchLen; i++)
        {   
            test[i] = fileContent[currPos+i];
        }

        cout << "SEARCHLEN: " << searchLen << endl;
        cout << "TEST: " << '\t' << '\t' << test << endl;
        cout << "SEARCH: " << '\t' << search << endl;
        cout << strcmp(test,search) << endl << endl;
        // Determine if a match is detected

        if(strcmp(test,search)==0)
        {
            cout << "----------------------> Match detected at: " << currPos << endl;
        }

        currPos …

我将指针转换为向量时遇到问题char *.这是我的代码,我做错了什么？

char * Word1 = (*fileRead)[i].c_str();
char * Word2 =  dict[j].c_str();

if(WordCmp(Word1,Word2)
{
    found = true;   
}

这是函数头WordCmp().

int WordCmp(char* Word1, char* Word2);

我得到的错误如下:

server.cpp:200: error: invalid conversion from 'const char*' to 'char*'
server.cpp:201: error: invalid conversion from 'const char*' to 'char*'

你好,我需要一只手正确地产生一个线程,我似乎无法正确的语法.这是我的代码......

// Spawn a thread--------------------------------------------------#    
    pthread_t thread1;  // thread object
    int rc1;

    if( (rc1=pthread_create( &thread1, NULL, spellCheck, NULL)) )
    {
        cout << "Thread creation failed: " << rc1 << endl;
    }

    pthread_join( thread1, NULL);

功能定义

void spellCheck(vector<string> * fileRead, list<string> * incorrectWord, vector<string> * correctWord)
{   

头文件

void spellCheck(vector<string> *fileRead, list<string> *incorrectWord, vector<string> *correctWord);

任何帮助将非常感激 :)

我的错误:

server.cpp:142: error: invalid conversion from 'void ()(std::vector<std:................. initializing argument 3 of 'int pthread_create(pthread_t, const pthread_attr_t*, void* ()(void), void*)'

我无法访问以下向量.我是向量的新手,所以这可能是一个很小的语法,我做错了.这是代码....

void spellCheck(vector<string> * fileRead)
{   
    string fileName = "/usr/dict/words";
    vector<string> dict;        // Stores file

    // Open the words text file
    cout << "Opening: "<< fileName << " for read" << endl;

    ifstream fin;
    fin.open(fileName.c_str());

    if(!fin.good())
    {
        cerr << "Error: File could not be opened" << endl;
        exit(1);
    }
    // Reads all words into a vector
    while(!fin.eof())
    {
        string temp;
        fin >> temp;
        dict.push_back(temp);
    }

    cout << "Making comparisons…" << endl;
    // Go through each word in vector
    for(int i=0; …

你好我是新的bash脚本,我有一个简单的程序,不适合我.我认为它是一个语法错误.

#!/bin/bash
#example1.sh
read Age
if ["$Age" -lt "18"]; then
    echo "You must go to school"
fi

当我输入1时,它说[1:命令未找到

您好我在将图像绘制到我的框架上时出错.我不确定这里出了什么问题.

我在这里得到以下错误.

Java: 77: cannot find symbol
symbol: variable image
location: class DrawComponent
g.drawImage(image, 0, 0, null);


class DrawComponent extends JComponent {
    public void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        // draw a circle with the same center
        double centerX = 250;
        double centerY = 180;
        double radius = 20;

        Ellipse2D circle = new Ellipse2D.Double();
        circle.setFrameFromCenter(centerX, centerY, centerX + radius, centerY + radius);
        g2.setPaint(Color.RED);
        g2.fill(circle);
        g2.draw(circle);

        String filename = "SydneyOperaHouse.jpeg";
        try{
            Image image = ImageIO.read(new File(filename));
        }catch(IOException ex){ …