c++ - 循环终止时无法获得输入

Question

大家好，我想计算项目的单词和字符等的数量。但是，在我输入^ D终止输入的行中，该行不计入字符等中。

输入终止的任何行均不计数。此外，由于某种原因，当我运行该程序时，它不会在底部显示语句，但在调试时会显示。

非常感谢您的帮助。

#include <stdio.h>

int main()
{
    int input;
    int words =0;
    int charecters =0;
    int spaces =0;
    int newline =0;
    int tab= 0;
    int total =0;
    int dummy;
    int lastChar;
    printf("Please start your input and press ^D to terminate:\n");
    while ((input=getchar())!= EOF)
    {
        if(input == ' ')
        {
            ++spaces;
        }
        else if(input =='\n')
        {
            ++newline;
            fflush(stdin);
        }
        else if(input == '\t' )
        {
            ++tab;
        }
        else
        {
            charecters++;
            dummy = input;
        }


        lastChar = input;
        if(dummy != lastChar)
        {
            words++;
        }

        total++;
    }
    printf("The total number of keyboard strokes was %d.\n", total);
    printf("The total number of charecters is %d\n", charecters);
    printf("The number of new lines is: %d\n", newline);
    printf("The number of  space is: %d\n", spaces);
    printf("The number of  tabs is: %d\n", tab);
    printf("The number of new words is: %d\n", words);

    return 0;

}

Answer 1

以下建议的代码:

执行所需的功能

干净地编译

实现具有2个状态的状态机

LINUX上的

将<ctrl-d>识别为输入的末尾，它必须是新行

上的第一个字符

合并了switch语句，以使每个“ Activity ”清晰可见

使用适当的水平和垂直间距，以便于阅读和理解

无法更正characters的拼写

现在，建议的代码为:

#include <stdio.h>

int main( void )
{
    int input;
    int words      = 0;
    int charecters = 0;
    int spaces     = 0;
    int newline    = 0;
    int tab        = 0;
    int total      = 0;

    printf( "Please start your input and press ^D to terminate:\n" );

    enum { inWord, notInWord } state = notInWord;
    while ( (input=getchar())!= EOF )
    {
        ++total;

        if( input == ' ' || input == '\n' || input == '\t' )
        {
            state = notInWord;
        }

        switch( input )
        {
            case ' ':
                ++spaces;
                break;

            case '\n':
                ++newline;
                break;

            case '\t':
                ++tab;
                break;

            default:
                charecters++;
                if  (state == notInWord )
                {
                    state = inWord;
                    ++words;
                }
        }
    }

    printf( "The total number of keyboard strokes was %d.\n", total );
    printf( "The total number of charecters is %d\n", charecters );
    printf( "The number of new lines is: %d\n", newline );
    printf( "The number of  space is: %d\n", spaces );
    printf( "The number of  tabs is: %d\n", tab );
    printf( "The number of new words is: %d\n", words );

    return 0;
}

该程序的典型运行:

Please start your input and press ^D to terminate:
lkfjaiennf;aliea vliesge lsker'
flkaiwore
The total number of keyboard strokes was 42.
The total number of charecters is 38
The number of new lines is: 2
The number of  space is: 2
The number of  tabs is: 0
The number of new words is: 4

请注意，程序无法将标点符号识别为单词分隔符。建议包括头文件ctype.h，以使用以下功能使代码更健壮:

ispunc()
isdigit()
isspace()