float 和 round 的可读性 cs50 问题

Question

我已经尝试了所有方法，但我无法找出代码中的错误。

让用户输入并数字母

int main(void) 
{
int letters = 0;

//Getting user input
string text = get_string("Text: ");

//Counting the letters
for (int i = 0; i < strlen(text); i++) 
{
    if (isalpha(text[i])) 
    {
        letters++;
    }

}

计算单词和句子

int words = 1;

//Checking the spaces and counting the words
for (int i = 1; i < strlen(text); i++) 
{
    if ((isspace(text[i])) && (isalpha(text[i+1])) ) 
    {
        words++;
    }
}


int sentences = 0;

//Checking the symbols and counting the sentences
for (int i = 0; i < strlen(text); i++) 
{
    if (text[i] == '.' || text[i] == '!' || text[i] == '?') 
    {
        sentences++;
    }
}

然后应用公式

double L = 100.0 * letters / words;
double S = 100.0 * sentences / words;

double index = 0.0588 * L - 0.296 * S - 15.8;

int trueIndex = round(index);

if (trueIndex >= 1 && trueIndex <= 16) 
{
    printf("Grade %i\n", trueIndex);
}
else 
{
    if (trueIndex < 1) 
    {
        printf("Before Grade 1\n");
    }
    if (trueIndex > 16) 
    {
        printf("Grade 16+\n");
    }
}

}

它给我这个错误：应为 "Grade 8\n"，而不是 "Grade 9\n"。我知道这与我处理花车的方式有关，但我不明白哪里出了问题

Answer 1

尝试从统计单词中删除 (isalpha(text[i+1]) 部分。 isalpha() 仅对字母字符 return 为真，即 a - z 、 A - Z。对于引号 return 为假且不计算此类字词。

Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do: once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it, "and what is the use of a book," thought Alice "without pictures or conversation?"

//Checking the spaces and counting the words
for (int i = 1; i < strlen(text); i++) 
{
    if (isspace(text[i]))
    {
        words++;
    }
}

Answer 2

也许这个块是在制造麻烦：

//Checking the spaces and counting the words
for (int i = 1; i < strlen(text); i++) 
{
    if ((isspace(text[i])) && (isalpha(text[i+1])) ) 
    {
        words++;
    }
}

特别是 (isalpha(text[i+1])) 在您假设的条件下，空格之后将出现字母字符。但是在测试用例中有带引号（"）的句子，这不算字母顺序。因此，你不会把它算作一个单词。

测试句，那应该是8级，而你return9级，是：

Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do: once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it, "and what is the use of a book," thought Alice "without pictures or conversation?

我试着运行那个程序符合你的条件，那句话确实returns 9。 TL;DR：删除空格后的字母顺序检查，你就成功了。

float 和 round 的可读性 cs50 问题

Readability cs50 problem with float and round

c

cs50