我的程序没有返回月份的值
我必须使用什么来将月份存储为变量？当我运行代码时，它说“警告字符常量对于它的类型来说太长了”。
我创建了一个程序来检查给定月份中有多少天，所以我从用户那里获取一个值并将其放入m. 我也试过取mas (character)的值，但它不起作用。我检查月份是二月还是另一个月。如果是二月，那么它会要求输入年，y，如果不是二月，那么它会匹配m所有条件下的值并输出月份，m。
#include<iostream>
using namespace std;
int main(){
char m;
int y;
cout<<"Plase Enter The month:- ";
cin>>m;
if (m=='january'||m=='march'||m=='april'||m=='may'||m=='june'||m=='july'||m=='august'||m=='september'||m=='december'||m=='october'||m=='november'||m=='jan'||m=='mar'||m=='apr'||m=='may'||m=='jun'||m=='jul'||m=='aug'||m=='sep'||m=='dec'||m=='oct'||m=='nov'||m=='JANUARY'||m=='MARCH'||m=='APRIL'||m=='MAY'||m=='JUNE'||m=='JULY'||m=='AUGUST'||m=='SEPTEMBER'||m=='OCTOBER'||m=='NOVEMBER'||m=='DECEMBER')
{
if (m=='jan'||m=='january'||m=='JANUARY')
{
cout<<"There Are 31";
}
else if (m=='march'||m=='mar'||m=='MARCH')
{
cout<<"There Are 31";
}
else if (m=='apr'||m=='april'||m=='APRIL')
{
cout<<"There Are 30";
}
else if (m=='may'||m=='MAY')
{
cout<<"There Are 31";
}
else if (m=='june'||m=='jun'||m=='JUNE')
{
cout<<"There Are 30";
}
else if (m=='jul'||m=='july'||m=='JULY')
{
cout<<"There Are 31";
}
else if (m=='aug'||m=='august'||m=='AUGUST')
{
cout<<"There Are 31";
}
else if (m=='sep'||m=='september'||m=='SEPTEMBER')
{
cout<<"There Are 30";
}
else if (m=='oct'||m=='october'||m=='OCTOBER')
{
cout<<"There Are 31";
}
else if (m=='nov'||m=='november'||m=='NOVEMBER')
{
cout<<"There Are 30";
}
else if (m=='dec'||m=='december'||m=='december')
{
cout<<"There Are 31";
}
}
else if(m=='feburary'||m=='feb'||m=='FEBURARY'){
cout<<"You Entered ";
cout<<m;
cout<<" which have more days in Leap year's ";
cout<<"So Please Enter The year:- ";
cin>>y;
if (y>=1752)
{
if ((y-1752)%4==0)
{
cout<<"There are 29 days";
}
else if((y-1752)%4!=0){
cout<<"There is 28 days";
}}
else{
cout<<"The First leap is started from 1752 so Please enter Number Greater than it";
}
}
else cout<<"------------------Please Enter A valid Month or Check Your Spelling--------------------";
return 0;
}
回答
尝试这个：
#include<iostream>
#include <string>
using namespace std;
int main() {
std::string m;
int y;
cout << "Plase Enter The month:- ";
cin >> m;
if (m == "january" || m == "march" || m == "april" || m == "may" || m == "june" || m == "july" || m == "august" || m == "september" || m == "december" || m == "october" || m == "november" || m == "jan" || m == "mar" || m == "apr" || m == "may" || m == "jun" || m == "jul" || m == "aug" || m == "sep" || m == "dec" || m == "oct" || m == "nov" || m == "JANUARY" || m == "MARCH" || m == "APRIL" || m == "MAY" || m == "JUNE" || m == "JULY" || m == "AUGUST" || m == "SEPTEMBER" || m == "OCTOBER" || m == "NOVEMBER" || m == "DECEMBER")
{
if (m == "jan" || m == "january" || m == "JANUARY")
{
cout << "There Are 31";
}
else if (m == "march" || m == "mar" || m == "MARCH")
{
cout << "There Are 31";
}
else if (m == "apr" || m == "april" || m == "APRIL")
{
cout << "There Are 30";
}
else if (m == "may" || m == "MAY")
{
cout << "There Are 31";
}
else if (m == "june" || m == "jun" || m == "JUNE")
{
cout << "There Are 30";
}
else if (m == "jul" || m == "july" || m == "JULY")
{
cout << "There Are 31";
}
else if (m == "aug" || m == "august" || m == "AUGUST")
{
cout << "There Are 31";
}
else if (m == "sep" || m == "september" || m == "SEPTEMBER")
{
cout << "There Are 30";
}
else if (m == "oct" || m == "october" || m == "OCTOBER")
{
cout << "There Are 31";
}
else if (m == "nov" || m == "november" || m == "NOVEMBER")
{
cout << "There Are 30";
}
else if (m == "dec" || m == "december" || m == "december")
{
cout << "There Are 31";
}
}
else if (m == "feburary" || m == "feb" || m == "FEBURARY") {
cout << "You Entered ";
cout << m;
cout << " which have more days in Leap year"s ";
cout << "So Please Enter The year:- ";
cin >> y;
if (y >= 1752)
{
if ((y - 1752) % 4 == 0)
{
cout << "There are 29 days";
}
else if ((y - 1752) % 4 != 0) {
cout << "There is 28 days";
}
}
else {
cout << "The First leap is started from 1752 so Please enter Number Greater than it";
}
}
else cout << "------------------Please Enter A valid Month or Check Your Spelling--------------------";
return 0;
}
在 C++ 中，单引号'只能用于字符，例如'e'，而不能用于字符串，例如'hello'。对于字符串，您使用双引号，如下所示"。
std::string如果您希望将输入与其他内容进行比较，您也应该使用s。