{"id":3538,"date":"2025-11-16T18:25:25","date_gmt":"2025-11-16T10:25:25","guid":{"rendered":"https:\/\/tobykskgd.life\/?p=3538"},"modified":"2025-11-16T18:25:40","modified_gmt":"2025-11-16T10:25:40","slug":"119","status":"publish","type":"post","link":"https:\/\/tobykskgd.life\/index.php\/119\/","title":{"rendered":"CS50P Problem Set 2"},"content":{"rendered":"\n

\u8bfe\u7a0b\uff1aCS50\u2019s Introduction to Programming with Python<\/a><\/p>\n\n\n\n

CS50 Python 2025 \u8bfe\u7a0b\u7684\u95ee\u9898\u96c6\u4f5c\u4e1a\u63d0\u4ea4\u3002\u4e3b\u8981\u63d0\u4f9b\u4e00\u4e2a\u672c\u4eba\u7684\u89e3\u9898\u601d\u8def\uff0c\u4ec5\u4f9b\u53c2\u8003\u3002<\/p>\n\n\n\n

camelCase<\/h3>\n\n\n\n

Problem:<\/p>\n\n\n\n

Source: en.wikipedia.org\/wiki\/Camel_case<\/a>
\u6765\u6e90\uff1aen.wikipedia.org\/wiki\/Camel_case<\/a><\/p>\n\n\n\n

In some languages, it\u2019s common to use camel case<\/a> (otherwise known as \u201cmixed case\u201d) for variables\u2019 names when those names comprise multiple words, whereby the first letter of the first word is lowercase but the first letter of each subsequent word is uppercase. For instance, whereas a variable for a user\u2019s name might be called name<\/code>, a variable for a user\u2019s first name might be called firstName<\/code>, and a variable for a user\u2019s preferred first name (e.g., nickname) might be called preferredFirstName<\/code>.
\u5728\u67d0\u4e9b\u8bed\u8a00\u4e2d\uff0c\u5f53\u53d8\u91cf\u540d\u79f0\u5305\u542b\u591a\u4e2a\u5355\u8bcd\u65f6\uff0c\u901a\u5e38\u4f7f\u7528\u9a7c\u5cf0\u547d\u540d<\/a>\u6cd5\uff08\u4e5f\u79f0\u4e3a\u201c\u6df7\u5408\u5927\u5c0f\u5199\u201d\uff09\u4f5c\u4e3a\u53d8\u91cf\u540d\u79f0\uff0c\u5176\u4e2d\u7b2c\u4e00\u4e2a\u5355\u8bcd\u7684\u7b2c\u4e00\u4e2a\u5b57\u6bcd\u662f\u5c0f\u5199\u7684\uff0c\u4f46\u6bcf\u4e2a\u540e\u7eed\u5355\u8bcd\u7684\u7b2c\u4e00\u4e2a\u5b57\u6bcd\u662f\u5927\u5199\u7684\u3002\u4f8b\u5982\uff0c\u7528\u6237\u540d\u7684\u53d8\u91cf\u53ef\u80fd\u79f0\u4e3a name<\/code>\uff0c\u800c\u7528\u6237\u540d\u5b57\u7684\u53d8\u91cf\u53ef\u80fd\u79f0\u4e3a firstName<\/code>\uff0c\u800c\u7528\u6237\u9996\u9009\u540d\u5b57\uff08\u4f8b\u5982\u6635\u79f0\uff09\u7684\u53d8\u91cf\u53ef\u80fd\u79f0\u4e3a preferredFirstName<\/code>\u3002<\/p>\n\n\n\n

Python, by contrast, recommends<\/a> snake case<\/a>, whereby words are instead separated by underscores (_<\/code>), with all letters in lowercase. For instance, those same variables would be called name<\/code>, first_name<\/code>, and preferred_first_name<\/code>, respectively, in Python.
\u76f8\u6bd4\u4e4b\u4e0b\uff0cPython \u5efa\u8bae\u4f7f\u7528<\/a>\u86c7\u5f62\u5927\u5c0f\u5199 <\/a>\uff0c\u5176\u4e2d\u5355\u8bcd\u7528\u4e0b\u5212\u7ebf \uff08_<\/code>\uff09 \u5206\u9694\uff0c\u6240\u6709\u5b57\u6bcd\u5747\u4e3a\u5c0f\u5199\u3002\u4f8b\u5982\uff0c\u8fd9\u4e9b\u76f8\u540c\u7684\u53d8\u91cf\u5728 Python \u4e2d\u5206\u522b\u79f0\u4e3a name<\/code>\u3001first_name<\/code> \u548c preferred_first_name<\/code>\u3002<\/p>\n\n\n\n

In a file called camel.py<\/code>, implement a program that prompts the user for the name of a variable in camel case and outputs the corresponding name in snake case. Assume that the user\u2019s input will indeed be in camel case.
\u5728\u540d\u4e3a camel.py<\/code> \u7684\u6587\u4ef6\u4e2d\uff0c\u5b9e\u73b0\u4e00\u4e2a\u7a0b\u5e8f\uff0c\u8be5\u7a0b\u5e8f\u63d0\u793a\u7528\u6237\u8f93\u5165\u9a7c\u5cf0\u547d\u540d\u6cd5\u7684\u53d8\u91cf\u540d\u79f0\uff0c\u5e76\u4ee5\u86c7\u5f62\u547d\u540d\u6cd5\u8f93\u51fa\u76f8\u5e94\u7684\u540d\u79f0\u3002\u5047\u8bbe\u7528\u6237\u7684\u8f93\u5165\u786e\u5b9e\u662f\u9a7c\u5cf0\u5f0f\u5927\u5c0f\u5199\u3002<\/p>\n\n\n\n

Submit:<\/p>\n\n\n\n

camelCase = input(\"camelCase: \")\nsnake_case = \"\"\n\nfor i in camelCase:\n    if i == i.lower():\n        snake_case += i\n    else:\n        snake_case =  snake_case + '_' + i.lower()\n\nprint(f\"snake_case: {snake_case}\")\n<\/code><\/pre>\n\n\n\n
Coke Machine<\/h3>\n\n\n\n
problem:<\/p>\n\n\n\n
Suppose that a machine sells bottles of Coca-Cola (Coke) for 50 cents and only accepts coins in these denominations: 25 cents, 10 cents, and 5 cents.
\u5047\u8bbe\u4e00\u53f0\u673a\u5668\u4ee5 50 \u7f8e\u5206\u7684\u4ef7\u683c\u51fa\u552e\u74f6\u88c5\u53ef\u53e3\u53ef\u4e50\uff08\u53ef\u4e50\uff09\uff0c\u5e76\u4e14\u53ea\u63a5\u53d7\u4ee5\u4e0b\u9762\u989d\u7684\u786c\u5e01\uff1a25 \u7f8e\u5206\u300110 \u7f8e\u5206\u548c 5 \u7f8e\u5206\u3002<\/p>\n\n\n\n
In a file called coke.py<\/code>, implement a program that prompts the user to insert a coin, one at a time, each time informing the user of the amount due. Once the user has inputted at least 50 cents, output how many cents in change the user is owed. Assume that the user will only input integers, and ignore any integer that isn\u2019t an accepted denomination.
\u5728\u540d\u4e3a coke.py<\/code> \u7684\u6587\u4ef6\u4e2d\uff0c\u5b9e\u73b0\u4e00\u4e2a\u7a0b\u5e8f\uff0c\u63d0\u793a\u7528\u6237\u4e00\u6b21\u63d2\u5165\u4e00\u4e2a\u786c\u5e01\uff0c\u6bcf\u6b21\u90fd\u901a\u77e5\u7528\u6237\u5e94\u4ed8\u91d1\u989d\u3002\u4e00\u65e6\u7528\u6237\u8f93\u5165\u4e86\u81f3\u5c11 50 \u7f8e\u5206\uff0c\u8f93\u51fa\u7528\u6237\u6b20\u591a\u5c11\u96f6\u94b1\u3002\u5047\u8bbe\u7528\u6237\u53ea\u8f93\u5165\u6574\u6570\uff0c\u5e76\u5ffd\u7565\u4efb\u4f55\u4e0d\u63a5\u53d7\u9762\u989d\u7684\u6574\u6570\u3002<\/p>\n\n\n\n
Submit:<\/p>\n\n\n\n
Amount_Due = 50\nprint(f\"Amount Due: {Amount_Due}\")\n\nwhile Amount_Due > 0:\n    Insert_Coin = int(input(\"Insert Coin: \"))\n    if Insert_Coin == 25 or Insert_Coin == 10 or Insert_Coin == 5:\n        Amount_Due -= Insert_Coin\n        if Amount_Due > 0:\n            print(f\"Amount Due: {Amount_Due}\")\n    else:\n        print(f\"Amount Due: {Amount_Due}\")\n\nprint(f\"Change Owed: {abs(Amount_Due)}\")\n<\/code><\/pre>\n\n\n\n
Just setting up my twttr<\/h3>\n\n\n\n
problem:<\/p>\n\n\n\n
When texting or tweeting, it\u2019s not uncommon to shorten words to save time or space, as by omitting vowels, much like Twitter was originally called twttr<\/em>. In a file called twttr.py<\/code>, implement a program that prompts the user for a str<\/code> of text and then outputs that same text but with all vowels (A, E, I, O, and U) omitted, whether inputted in uppercase or lowercase.
\u53d1\u77ed\u4fe1\u6216\u53d1\u63a8\u6587\u65f6\uff0c\u7f29\u77ed\u5355\u8bcd\u4ee5\u8282\u7701\u65f6\u95f4\u6216\u7a7a\u95f4\u7684\u60c5\u51b5\u5e76\u4e0d\u5c11\u89c1\uff0c\u4f8b\u5982\u7701\u7565\u5143\u97f3\uff0c\u5c31\u50cf Twitter \u6700\u521d\u79f0\u4e3a twttr<\/em> \u4e00\u6837\u3002\u5728\u540d\u4e3a twttr.py<\/code> \u7684\u6587\u4ef6\u4e2d\uff0c\u5b9e\u73b0\u4e00\u4e2a\u7a0b\u5e8f\uff0c\u8be5\u7a0b\u5e8f\u63d0\u793a\u7528\u6237\u8f93\u5165\u6587\u672c str<\/code>\uff0c\u7136\u540e\u8f93\u51fa\u76f8\u540c\u7684\u6587\u672c\uff0c\u4f46\u7701\u7565\u6240\u6709\u5143\u97f3\uff08A\u3001E\u3001I\u3001O \u548c U\uff09\uff0c\u65e0\u8bba\u662f\u4ee5\u5927\u5199\u8fd8\u662f\u5c0f\u5199\u8f93\u5165\u3002<\/p>\n\n\n\n
Submit:<\/p>\n\n\n\n
in_put = input(\"Input: \")\nout_put = \"\"\n\nfor i in in_put:\n    if i.lower() != 'a' and i.lower() != 'e' and i.lower() != 'i' and i.lower() != 'o' and i.lower() != 'u':\n        out_put += i\n\nprint(f\"Output: {out_put}\")\n<\/code><\/pre>\n\n\n\n
Vanity Plates<\/h3>\n\n\n\n
problem:<\/p>\n\n\n\n
In Massachusetts, home to Harvard University, it\u2019s possible to request a vanity license plate<\/a> for your car, with your choice of letters and numbers instead of random ones. Among the requirements, though, are:
\u5728\u54c8\u4f5b\u5927\u5b66\u6240\u5728\u7684\u9a6c\u8428\u8bf8\u585e\u5dde\uff0c\u53ef\u4ee5\u4e3a\u60a8\u7684\u6c7d\u8f66\u7d22\u53d6\u4e00\u4e2a\u865a\u8363\u8f66\u724c <\/a>\uff0c\u60a8\u53ef\u4ee5\u9009\u62e9\u5b57\u6bcd\u548c\u6570\u5b57\uff0c\u800c\u4e0d\u662f\u968f\u673a\u7684\u3002\u4e0d\u8fc7\uff0c\u8fd9\u4e9b\u8981\u6c42\u5305\u62ec\uff1a<\/p>\n\n\n\n