无法弄清楚这个分段错误

Question

我对编程还很陌生，我正在做 CS50，在这个拼字游戏程序中我遇到了麻烦，因为我无法弄清楚我犯了哪个分段错误。可能是我的索引在我的数组之外。如果您能找到问题并向我解释一下，我将不胜感激。

#include <ctype.h>
#include <cs50.h>
#include <stdio.h>
#include <string.h>

// Points assigned to each letter of the alphabet
int POINTS[] = {1, 3, 3, 2, 1, 4, 2, 4, 1, 8, 5, 1, 3, 1, 1, 3, 10, 1, 1, 1, 1, 4, 4, 8, 4, 10};


int compute_score(string word);

int main(void)
{

    // Get input words from both players
    string word1 = get_string("Player 1: ");
    string word2 = get_string("Player 2: ");

    // Score both words
    int score1 = compute_score(word1);
    int score2 = compute_score(word2);
if (score1 > score2)
{
    printf("Player 1 wins!\n");
}
else if (score1 == score2)
{
    printf("Tie!\n");
}
else
{
    printf("Player 2 wins!\n");
}
    // TODO: Print the winner
}

int compute_score(string word)
{
    int number;
    int sum1=0;
for (int i = 0; i<strlen(word); i++)
{
  if (isupper(word))
  {
      number = POINTS[word[i]-'A'];
 }
 else if (word[i] < 97 || word[i]>122 || word[i]<65 || word[i]>90)
   {
        number = 0;
   }
   else
   {
     number = POINTS[word[i] - 'a'];
   }
   sum1 = sum1 + number;
}
   return sum1;
    // Assign points to letters
    // read the letters in the word
    // covert the letters into scores and add
    // TODO: Compute and return score for string
}

Answer 1

if语句中至少有这个条件

 if (isupper(word))

不正确。你必须写

if (isupper( ( unsigned char )word[i]))

这个if语句中的条件

 else if (word[i] < 97 || word[i]>122 || word[i]<65 || word[i]>90)

没有意义。对于初学者，不要使用像 97 这样的幻数。条件可以看起来像

else if ( !( ( word[i] >= 'a' && word[i] <= 'z' ) || ( word[i] >= 'A' && word[i] <= 'Z' ) ) )

无法弄清楚这个分段错误

Can't figure out this segmentation fault

c

if-statement

char

cs50

uppercase