Question

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

int main (int argc, string argv[])
{
if (argc != 2)
{
    printf ("Usage: ./caesar k\n");
    return 1;
}
int k = atoi (argv[1]);

printf ("plaintext: ");
string p = get_string ();

printf ("ciphertext: ");

for (int i = 0, n = strlen (p); i < n; i++)
{
    if (isupper (p[i]))
    {
        int alpha = p[i];
        alpha = alpha - 65;
        alpha = (alpha + k) % 26;

        char cipher = alpha + 65 ;

        printf ("%c", cipher);
    }  
    else if (islower (p[i]))
    {
        int alpha = p[i];
        alpha = alpha - 97;
        alpha = (alpha + k) % 26;

        char cipher = alpha + 97 ;

        printf ("%c", cipher);
    }
    else
    {
        printf ("%c", p[i]);
    }
}
printf ("\n");
return 0;
}

该程序完美运行，没有＆＃39;返回0＆＃39;最后但是cs50 pset 具体说明程序应该从main返回0退出。什么我做错了吗？

Answer 1

代码对我来说很好。你得到的确切错误是什么？

没有环绕的测试：

$./stack_question 5
plaintext: Hello
ciphertext: Mjqqt

测试环绕：

$./stack_question 36
plaintext: Hello
ciphertext: Rovvy

另外，你可以尝试在工作区上运行一个简单的hello world程序吗？如果没有，我建议您创建一个新工作区（CS50 IDE - ＆gt; Dashboard - ＆gt;创建新工作区）有时候c9工作区会让我感到烦恼，我甚至无法运行一个简单的hello world程序

Answer 2

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

int main (int argc, string argv[])
{
if (argc != 2)
{
    printf ("Usage: ./caesar k\n");
    return 1;
}
int k = atoi (argv[1]);

printf ("plaintext: ");
string p = get_string ();

printf ("ciphertext: ");

for (int i = 0, n = strlen (p); i < n; i++)
{
    if (isupper (p[i]))
    {
        int alpha = p[i];
        alpha = alpha - 65;
        alpha = (alpha + k) % 26;

        char cipher = alpha + 65 ;

        printf ("%c", cipher);
    }  
    else if (islower (p[i]))
    {
        int alpha = p[i];
        alpha = alpha - 97;
        alpha = (alpha + k) % 26;

        char cipher = alpha + 97 ;

        printf ("%c", cipher);
    }
    else
    {
        printf ("%c", p[i]);
    }
}
printf ("\n");
return 0;
}

CS50 PSET2 CAESAR clang：错误：链接器命令失败，退出代码为1

2 个答案: