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double num = 12345.678; char * sir; int dec_pl, sign, ndigits = 3; /* Keep 3 digits of precision. * / str = fcvt(num, ndigits, &dec-pl, &sign); /* Convert the float to a string. * / printf("Original number; %f\n" , num) ; /* Print the original floating-point value....
QString 追加/删除: #include<QCoreApplication>#include<iostream>#include<QChar>#include<QString>intmain(intargc,char*argv[]){QCoreApplicationa(argc,argv);// 定义两个字符串并将其链接在一起QString Str1="hello",Str2="lyshark",temp;temp=Str1+Str2;std::cout<<temp.toStdString().data()<<...
1、仿函数的概念仿函数是一个是通过重载()运算符模拟函数形为的类。...); QString str = "abcde"; int len1 = str.length()-1; int len2 = str.length()+1; //使用方法...1 qDebug()<<...
QString直接支持不同字符编码间的相互转换 QString直接支持std::string和std::wstring的相互转换 QString...
QString Str3 = "hello "; Str3.append("lyshark"); Str3.push_back("test"); Str3.remove("hello"); Str3.prepend("-->"); std::cout << Str3.toStdString().data() << std::endl; // 使用Sprintf/arg 将特定字符串连接 QString Str4; ...
uint a=2147483649,b=321;doublec=111.1;string str="ABC123\n";intmain(intaa,intbb){intx=0,y=3;a++;a--;if(a!=b){a=1;}else{a=2;}printf("ABC %d '\" \\ 123\r\n",a);}intadd(inta1,inta2){returna1+a2;} 词法分析器的代码如下lexer.h: ...
QStringstr;str.toStdString();// Returns std::string, usually in UTF-16str.toUtf8().constData...
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