Question

每次编译时，我都会不断看到此消息。我想念什么吗？我已经检查了好几次了，这似乎是正确的。错误中特别提到的那一行是在声明了main函数之后。

// Caesar Cipher Program

int main(int argc, string argv[]); //need to check that argv[1] is not a float
{
    for (argc == 2 && int key = atoi(argv[1]) && key > 0) // Check that argv[0] is the file name as well? converts "key" (string) into int value
    {
        string text = get_string("plaintext: ");// Prompts user for plaintext

        printf("ciphertext: ");// Prints ciphertext

        for (int i = 0, n = strlen(text); i < n; i++)// Example of good design bc doesn't have to check the length of the string on every iteration
            {
                if (isalpha(text[i]) == true && isupper(text[i]) == true)
                    {
                        int j = 'text[i]' % 65;
                        int k = (j + key) % 26;
                        printf('65 + k');
                    }
                else if (isalpha(text[i]) == true && islower(text[i]) == true)
                    {
                        int l = 'text[i]' % 97;
                        int m = (l + key) % 26;
                        printf('97 + m');
                    }
                else
                    printf(text[i]);
            }

        return 1;
    }

    default
    printf("Try again.");
    return 0;

}

Answer 1

我刚刚发现了错误如果您看您在主函数的顶部用分号结束，则不应为：
int main(int argc, string argv[]) ; //need to check that argv[1] is not a float而是：
int main(int argc, string argv[]) //need to check that argv[1] is not a float如果看到多余的分号。希望对您有所帮助，请告诉我。

不断收到“错误：预期的标识符或'（'“，但我不明白为什么

1 个答案: