使用 if else 将数字转换为单词

Question

我是c++的初学者。我写了一个程序把数字转换成文字。对于 11-19 和 20、30、40、50、60、70、80、90 之间的数字，我得到错误的输出。我还尝试在最后两个 if 语句之间添加 else 语句，这样即使第一个 if 语句为真，它也不会执行所有 if 语句，但它会给我一个错误 "else without a previous if".

//This program converts number into words
#include<iostream>
using namespace std;
main()
{
    int number,unit,ten;
    cout<<"Please enter any number between 0-99: ";
    cin>>number;
    ten=number/10;
    unit=number%10;
    if(number<0 | number>99)
        cout<<"Number is out of range";
    if(number>=11 && number <=19);
    {
        if(number==11) cout<<"eleven"; 
        if(number==12) cout<<"twelve";
        if(number==13) cout<<"thirteen"; 
        if(number==14) cout<<"fourteen";
        if(number==15) cout<<"fifteen";
        if(number==16) cout<<"sixteen";
        if(number==17) cout<<"seventeen";
        if(number==18) cout<<"eighteen";
        if(number==19) cout<<"ninteen";
    }
    if(ten>=2 && ten<=9)    
    {   
        if(ten==1) cout<<"ten";
        if(ten==2) cout<<"twenty";
        if(ten==3) cout<<"thirty";
        if(ten==4) cout<<"fourty";
        if(ten==5) cout<<"fifty";
        if(ten==6) cout<<"sixty";
        if(ten==7) cout<<"seventy";
        if(ten==8) cout<<"eighty";
        if(ten==9) cout<<"ninty";
    }
    if(unit>=0 && unit <=9)
    {
        if(unit==0) cout<<" zero";
        if(unit==1) cout<<" one";
        if(unit==2) cout<<" two";
        if(unit==3) cout<<" three";
        if(unit==4) cout<<" four";
        if(unit==5) cout<<" five";
        if(unit==6) cout<<" six";
        if(unit==7) cout<<" seven";
        if(unit==8) cout<<" eight";
        if(unit==9) cout<<" nine";
    }
}

输出 1:-

Please enter any number between 0-99: 12
twelve two

输出 2：-

Please enter any number between 0-99: 30
thirty zero

Answer 1

根据您的 if 条件，您得到的实际上是正确的。如果您写下 3 if 个条件，它将检查其中的三个。另外，去掉第二个 if!

的分号

所以第一个 12 转到第一个 if 并打印 "twelve"。

转到第二个 if。 12/10是1.2所以作为一个整数，它是`1。它不会进入第二个if。由于分号，它无论如何都不会进入。

但它出现在第三个：12%10。

正如您在 ifs 中所做的那样！

此外，我担心这是否适合您：if(number<0 | number>99)，因为它应该是 ||，而不是 |。

Answer 2

您在第二个 if 之后有一个分号 ;。而且，你应该使用 || 而不是 |。你也应该排除 ten==1.

的情况

//This program converts number into words
#include<iostream>
using namespace std;
main()
{
    int number,unit,ten;
    cout<<"Please enter any number between 0-99: ";
    cin>>number;
    ten=number/10;
    unit=number%10;
    if(number<0 || number>99)
    {
        cout<<"Number is out of range";
    }
    if(ten == 1)
    {
        if(number==10) cout<<"ten"; 
        if(number==11) cout<<"eleven"; 
        if(number==12) cout<<"twelve";
        if(number==13) cout<<"thirteen"; 
        if(number==14) cout<<"fourteen";
        if(number==15) cout<<"fifteen";
        if(number==16) cout<<"sixteen";
        if(number==17) cout<<"seventeen";
        if(number==18) cout<<"eighteen";
        if(number==19) cout<<"ninteen";
    }
    else {   
        if(ten==2) cout<<"twenty";
        if(ten==3) cout<<"thirty";
        if(ten==4) cout<<"fourty";
        if(ten==5) cout<<"fifty";
        if(ten==6) cout<<"sixty";
        if(ten==7) cout<<"seventy";
        if(ten==8) cout<<"eighty";
        if(ten==9) cout<<"ninty";

        // ****
        if(unit==0 && ten ==0) cout<<" zero";
        if(unit==1) cout<<" one";
        if(unit==2) cout<<" two";
        if(unit==3) cout<<" three";
        if(unit==4) cout<<" four";
        if(unit==5) cout<<" five";
        if(unit==6) cout<<" six";
        if(unit==7) cout<<" seven";
        if(unit==8) cout<<" eight";
        if(unit==9) cout<<" nine";
    }
}

所有案例的输出：

Please enter any number between 0-99: -1
Number is out of range

Please enter any number between 0-99: 0
 zero

Please enter any number between 0-99: 1
 one

Please enter any number between 0-99: 2
 two

Please enter any number between 0-99: 3
 three

Please enter any number between 0-99: 4
 four

Please enter any number between 0-99: 5
 five

Please enter any number between 0-99: 6
 six

Please enter any number between 0-99: 7
 seven

Please enter any number between 0-99: 8
 eight

Please enter any number between 0-99: 9
 nine

Please enter any number between 0-99: 10
ten

Please enter any number between 0-99: 11
eleven

Please enter any number between 0-99: 12
twelve

Please enter any number between 0-99: 13
thirteen

Please enter any number between 0-99: 14
fourteen

Please enter any number between 0-99: 15
fifteen

Please enter any number between 0-99: 16
sixteen

Please enter any number between 0-99: 17
seventeen

Please enter any number between 0-99: 18
eighteen

Please enter any number between 0-99: 19
ninteen

Please enter any number between 0-99: 20
twenty

Please enter any number between 0-99: 21
twenty one

Please enter any number between 0-99: 22
twenty two

Please enter any number between 0-99: 23
twenty three

Please enter any number between 0-99: 24
twenty four

Please enter any number between 0-99: 25
twenty five

Please enter any number between 0-99: 26
twenty six

Please enter any number between 0-99: 27
twenty seven

Please enter any number between 0-99: 28
twenty eight

Please enter any number between 0-99: 29
twenty nine

Please enter any number between 0-99: 30
thirty

Please enter any number between 0-99: 31
thirty one

Please enter any number between 0-99: 32
thirty two

Please enter any number between 0-99: 33
thirty three

Please enter any number between 0-99: 34
thirty four

Please enter any number between 0-99: 35
thirty five

Please enter any number between 0-99: 36
thirty six

Please enter any number between 0-99: 37
thirty seven

Please enter any number between 0-99: 38
thirty eight

Please enter any number between 0-99: 39
thirty nine

Please enter any number between 0-99: 40
fourty

Please enter any number between 0-99: 41
fourty one

Please enter any number between 0-99: 42
fourty two

Please enter any number between 0-99: 43
fourty three

Please enter any number between 0-99: 44
fourty four

Please enter any number between 0-99: 45
fourty five

Please enter any number between 0-99: 46
fourty six

Please enter any number between 0-99: 47
fourty seven

Please enter any number between 0-99: 48
fourty eight

Please enter any number between 0-99: 49
fourty nine

Please enter any number between 0-99: 50
fifty

Please enter any number between 0-99: 51
fifty one

Please enter any number between 0-99: 52
fifty two

Please enter any number between 0-99: 53
fifty three

Please enter any number between 0-99: 54
fifty four

Please enter any number between 0-99: 55
fifty five

Please enter any number between 0-99: 56
fifty six

Please enter any number between 0-99: 57
fifty seven

Please enter any number between 0-99: 58
fifty eight

Please enter any number between 0-99: 59
fifty nine

Please enter any number between 0-99: 60
sixty

Please enter any number between 0-99: 61
sixty one

Please enter any number between 0-99: 62
sixty two

Please enter any number between 0-99: 63
sixty three

Please enter any number between 0-99: 64
sixty four

Please enter any number between 0-99: 65
sixty five

Please enter any number between 0-99: 66
sixty six

Please enter any number between 0-99: 67
sixty seven

Please enter any number between 0-99: 68
sixty eight

Please enter any number between 0-99: 69
sixty nine

Please enter any number between 0-99: 70
seventy

Please enter any number between 0-99: 71
seventy one

Please enter any number between 0-99: 72
seventy two

Please enter any number between 0-99: 73
seventy three

Please enter any number between 0-99: 74
seventy four

Please enter any number between 0-99: 75
seventy five

Please enter any number between 0-99: 76
seventy six

Please enter any number between 0-99: 77
seventy seven

Please enter any number between 0-99: 78
seventy eight

Please enter any number between 0-99: 79
seventy nine

Please enter any number between 0-99: 80
eighty

Please enter any number between 0-99: 81
eighty one

Please enter any number between 0-99: 82
eighty two

Please enter any number between 0-99: 83
eighty three

Please enter any number between 0-99: 84
eighty four

Please enter any number between 0-99: 85
eighty five

Please enter any number between 0-99: 86
eighty six

Please enter any number between 0-99: 87
eighty seven

Please enter any number between 0-99: 88
eighty eight

Please enter any number between 0-99: 89
eighty nine

Please enter any number between 0-99: 90
ninty

Please enter any number between 0-99: 91
ninty one

Please enter any number between 0-99: 92
ninty two

Please enter any number between 0-99: 93
ninty three

Please enter any number between 0-99: 94
ninty four

Please enter any number between 0-99: 95
ninty five

Please enter any number between 0-99: 96
ninty six

Please enter any number between 0-99: 97
ninty seven

Please enter any number between 0-99: 98
ninty eight

Please enter any number between 0-99: 99
ninty nine

Please enter any number between 0-99: 100
Number is out of range

Answer 3

您应该使用 int main() 而不是 main() 并在 int main()

return 0;

行if(number<0 | number>99)应该是if(number<0 || number>99)
行if(number>=11 && number <=19);应该是if(number>=11 && number <=19)
在if(ten>=2 && ten<=9)之前应该加上else.

以下 code 可行：

//This program converts number into words
#include<iostream>
using namespace std;
int main()
{
    int number,unit,ten;
    cout<<"Please enter any number between 0-99: ";
    cin>>number;
    ten=number/10;
    unit=number%10;
    if(number<0 || number>99)
        cout<<"Number is out of range";
    if(number>=11 && number <=19)
    {
        if(number==11) cout<<"eleven";
        if(number==12) cout<<"twelve";
        if(number==13) cout<<"thirteen";
        if(number==14) cout<<"fourteen";
        if(number==15) cout<<"fifteen";
        if(number==16) cout<<"sixteen";
        if(number==17) cout<<"seventeen";
        if(number==18) cout<<"eighteen";
        if(number==19) cout<<"ninteen";
    } else {
        if(ten>=2 && ten<=9)
        {
            if(ten==1) cout<<"ten";
            if(ten==2) cout<<"twenty";
            if(ten==3) cout<<"thirty";
            if(ten==4) cout<<"fourty";
            if(ten==5) cout<<"fifty";
            if(ten==6) cout<<"sixty";
            if(ten==7) cout<<"seventy";
            if(ten==8) cout<<"eighty";
            if(ten==9) cout<<"ninty";
        }
        if(unit>=0 && unit <=9)
        {
            if(unit==0) cout<<" zero";
            if(unit==1) cout<<" one";
            if(unit==2) cout<<" two";
            if(unit==3) cout<<" three";
            if(unit==4) cout<<" four";
            if(unit==5) cout<<" five";
            if(unit==6) cout<<" six";
            if(unit==7) cout<<" seven";
            if(unit==8) cout<<" eight";
            if(unit==9) cout<<" nine";
        }
    }

    return 0;
}

Answer 4

对于这种情况，switch 语句更有意义。试试这个代码：

#include<iostream>
using namespace std;
int main()
{
    for (int number = 1; number <= 99; number++)
    {
        int ten=number/10;
        int unit=number%10;
        if(number<0 || number>99)
        {
            cout<<"Number is out of range";
            return 1;
        }
        if(ten == 1)
        {
            switch ( number )
            {
            case 10: cout<<"ten"; break;
            case 11: cout<<"eleven"; break;
            case 12: cout<<"twelve"; break;
            case 13: cout<<"thirteen"; break;
            case 14: cout<<"fourteen"; break;
            case 15: cout<<"fifteen"; break;
            case 16: cout<<"sixteen"; break;
            case 17: cout<<"seventeen"; break;
            case 18: cout<<"eighteen"; break;
            case 19: cout<<"nineteen"; break;
            }
        }
        else
        {
            if(ten>=2 && ten<=9)    
            {   
                switch (ten)
                {
                case 2: cout<<"twenty"; break;
                case 3: cout<<"thirty"; break;
                case 4: cout<<"fourty"; break;
                case 5: cout<<"fifty"; break;
                case 6: cout<<"sixty"; break;
                case 7: cout<<"seventy"; break;
                case 8: cout<<"eighty"; break;
                case 9: cout<<"ninty"; break;
                }
            }
            if ( unit != 0 and ten != 0 )
            {
                cout << " ";
            }
            switch ( unit )
            {
                case 0: if ( ten == 0 ) cout<<"zero"; break;
                case 1: cout<<"one"; break;
                case 2: cout<<"two"; break;
                case 3: cout<<"three"; break;
                case 4: cout<<"four"; break;
                case 5: cout<<"five"; break;
                case 6: cout<<"six"; break;
                case 7: cout<<"seven"; break;
                case 8: cout<<"eight"; break;
                case 9: cout<<"nine"; break;
            }
        }
        cout << "\n";
    }
    return 0;
}

我还发现了以下错误：

您在第一个 if 语句中使用按位或 | 而不是布尔值或 ||。您也不要在打印 "Number is out of range" 后停止其余代码，我已经通过返回解决了这个问题。
你的第二个if语句末尾有一个分号，这个if语句也可以简化为ten == 1.
您需要在打印 'teens 后阻止其余代码运行，这可以通过 else 来完成。
你从不打印 "ten"，它可能应该打印成 'teens，但打印成 20、30 等，但由于周围的 if 语句，它实际上永远不会打印。
您在 20、30 等之后打印 "zero"。如果 ten 是 0。这可以通过仅打印 "zero" 来解决。
if 语句 if(unit>=0 && unit <=9) 将始终为真，因此可以删除。

使用 if else 将数字转换为单词

Converting number into words using if else

c++

numbers

word