小编M.T*_*M.T的帖子

如何设置枚举类型提示的默认值，我尝试将其设置为 0 或 1，或者什么都不设置，但出现相同的错误？

enum tip {
pop,
rap,
rock
};

class Pesna{
private:
char *ime;
int vremetraenje;
tip tip1;

public:
//constructor
Pesna(char *i = "NULL", int min = 0, tip t){
    ime = new char[strlen(i) + 1];
    strcpy(ime, i);
    vremetraenje = min;
    tip1 = t;
}

};

编译代码时,我收到此错误:找不到名称SimpleChanges.我是Angular 2的新手,你能帮我找到错误的位置吗？这是我的家.

import { Component } from '@angular/core';

import { NavController } from 'ionic-angular';
import {Observable} from 'rxjs/Rx';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
  date: Date;
  constructor(public navCtrl: NavController) {
    this.date = new Date();
  }


  ticks = 0;
  ngOnChanges(changes: {[propertyName: string]: SimpleChanges}){
    if(changes['ticks']){
        if(this.ticks == 20)
            this.ticks = 0;
    }
  }
  ngOnInit(){
    let timer = Observable.timer(0,1000);
    timer.subscribe(t=>this.ticks = t);
  };



}

className &temp (someOtherclassName &c)

问题是我应该返回什么我试图返回一个在类中新创建的对象,它不起作用,我也尝试返回引用或指针,它不起作用.

Klub &novKlub(Clen &c){
    Klub newKlub;
    strcpy(newKlub.name, name);

    for(int i = 0; i < elements; i++){
        if(c.getLevel() == clenovi->getLevel()){
            newKlub += clenovi[i];

        }

    }
    return newKlub;
}

这是所有代码:

#include<iostream>
#include<cstring>
using namespace std;
class Clen{
private:
char name[50];
char surname[50];
int level;
public:
Clen(char n[] = "null", char s[] = "null", int l = 1){
    strcpy(name, n);
    strcpy(surname, s);
    level = l;
}

//operator++
Clen operator++(int){
    Clen temp(*this);
    ++level;
    return temp;
}

//++operator
Clen &operator ++ …