Question

我是C ++的初学者。我写了一个程序，将数字转换成单词。对于11-19和20、30、40、50、60、70、80、90之类的数字，我的输出错误。我还尝试在最后两个if语句之间添加else语句，以便即使第一个if值为true也不执行所有if语句，但是它给我一个错误，“否则就没有前面的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

第二个;之后是分号if。另外，您应该使用||而不是|。另外，您应排除ten==1时的情况。

//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";
    }
}

所有情况下的输出：

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 2

您应使用int main()而不是main()，并在return 0;中添加int main()
第if(number<0 | number>99)行应为if(number<0 || number>99)
第if(number>=11 && number <=19);行应为if(number>=11 && number <=19)
在if(ten>=2 && ten<=9)之前应添加else。

关注code可能会起作用：

//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 3

由于您的if条件，您得到的实际上是正确的。如果写下3个if条件，它将检查三个条件。另外，如果第二个要用分号！

因此第一个数字12转到第一个if并显示“十二”。

转到第二个if。 12/10是1.2，因此作为整数，它是`1。如果第二个则不行。由于分号，它无论如何都不会进行。

但它在第三项中使用：12%10。

就像您在ifs中一样！

此外，我担心这对您有用：if(number<0 | number>99)，应该是||，而不是|。

Answer 4

在这种情况下，使用switch语句更有意义。尝试以下代码：

#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：

在第一个if语句中使用按位或|而不是布尔值或||。在打印"Number is out of range"之后，您也不会停止其余代码，我已经通过返回修复了该问题。
第二条if语句的末尾有一个分号，该if语句也可以简化为ten == 1。
您需要在打印青少年之后阻止其余代码运行，这可以通过else来完成。
您从不打印"ten"，它可能应该用'teens来打印，但是要用20、30等打印。但是由于周围的if语句，它实际上不会被打印。
您在20、30等之后打印“零”。如果"zero"为ten，则只能通过打印0来解决此问题。
if语句if(unit>=0 && unit <=9)将始终为true，因此可以将其删除。

使用if else将数字转换为单词

4 个答案: