问如何输入文件并使用它来计算大小写字母、数字和标点符号？
EN

Stack Overflow用户

提问于 2012-08-12 19:22:40

回答 3查看 6.3K关注 0票数 0

我的目标很简单。向用户索要包含大小写字母、数字和标点符号的简单文本文件。然后拿出文件，打开它，扫描前面提到的每个元素，并对每个元素进行计数。最后，输出每个字符的总数(即包含的大写字母总数、小写字母总数、数字总数和标点符号总数)。

不幸的是，我的问题并不是那么简单。我真的很困惑(例如，在概念和语法上)C如何将输入文件传递给fgetc等函数，然后测试它以增加计数器。我的程序崩溃了，我也不知道为什么。我想我最初的问题是，为什么它会崩溃？我的代码如下；

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>


int main()
{
    char Character = 0;
    int words = 0;
    int upper_case = 0;
    int lower_case = 0;
    int punctuation = 0;
    int digits = 0;
    int entered_words = 0;
    char user_filename[100];
    char user_filecontent[100];



    printf("Enter the filename of the file containing text and/or digits:\n");
    printf("(hit the Enter key when done)\n");
    gets(user_filename);

    FILE *fp;
    fp = fopen (user_filename, "r");


    if (fp == NULL)
    {
        printf("\nError, Unable to open the file for reading\n");
    }


    while((fp = fgetc(fp)) != EOF)
    {


            while((Character=fgetc(fp)) != '\n');
            {

                if (isalnum (Character))
                {
                    if (!entered_words)
                    {
                        entered_words = 1;
                        words++;
                    }
                }


                else
                {
                    if (entered_words)
                    {
                        entered_words = 0;
                    }
                }


                if (isupper(Character))
                {
                    upper_case++;
                }


                else if (islower(Character))
                {
                    lower_case++;
                }


                else if (isdigit(Character))
                {
                    digits++;
                }


                else if (ispunct(Character))
                {
                    punctuation++;
                }

            }

    fclose(fp);
    }

    printf("Total number of words is %d.\n", words);
    printf("Total number of digits are %d.\n", digits);
    printf("Total number of uppercase letters is %d.\n", upper_case);
    printf("Total number of lowercase letters is %d.\n", lower_case);
    printf("Total number of punctuation characters is %d.\n", punctuation);

return 0;
}

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回答 3

Stack Overflow用户

发布于 2012-08-12 19:39:10

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>


int main()
{
    char Character = 0;
    int words = 0;
    int upper_case = 0;
    int lower_case = 0;
    int punctuation = 0;
    int digits = 0;
    int entered_words = 0;
    char user_filename[100];
    char user_filecontent[100];



    printf("Enter the filename of the file containing text and/or digits:\n");
    printf("(hit the Enter key when done)\n");
    gets(user_filename);

    FILE *fp;
    fp = fopen (user_filename, "r");


    if (fp == NULL)
    {
        printf("\nError, Unable to open the file for reading\n");
    }


    while((Character = fgetc(fp)) != EOF)
    {

                if (isalnum (Character))
                {
                    if (!entered_words)
                    {
                        entered_words = 1;
                        words++;
                    }
                }


                else
                {
                    if (entered_words)
                    {
                        entered_words = 0;
                    }
                }


                if (isupper(Character))
                {
                    upper_case++;
                }


                else if (islower(Character))
                {
                    lower_case++;
                }


                else if (isdigit(Character))
                {
                    digits++;
                }


                else if (ispunct(Character))
                {
                    punctuation++;
                }
    }

    fclose(fp);

    printf("Total number of words is %d.\n", words);
    printf("Total number of digits are %d.\n", digits);
    printf("Total number of uppercase letters is %d.\n", upper_case);
    printf("Total number of lowercase letters is %d.\n", lower_case);
    printf("Total number of punctuation characters is %d.\n", punctuation);

return 0;
}