我有一项任务,我应该为我的计算机科学MOOC CS50上交。在其中我必须通过哈佛网站上交作业,但它不接受我的代码,而它说“警告:隐含声明......”
有没有办法关闭它?
我正在使用两个函数islower()
和isupper()
,它们是导致挂断的原因。
我的代码似乎工作正常,它编译和一切。顺便说一句,如果有人想告诉我我的代码有多糟糕,那将是值得赞赏的。我没有得到很多(或任何)批评在网上上课。
#include <stdio.h>
#include "cs50.h"
#include <stdio.h>
#include <string.h>
int main(int argc, string argv[])
{
int salt, cipherNum;
char cipher[40];
char letter;
//// Greeting
printf("Please enter the text to ceez...\n");
//// grab text
string txxt = GetString();
if (argc == 2) // must have command line argument
{
salt = atoi(argv[1]) % 26;
//printf("Salt: %d\n", salt);
}
else // yell at user if command line arg is not there
{
printf("Not cool! I need something to caesariphy...\n");
return 1;
}
//~
// This will iterate over each letter in the text
for (int i = 0, n = strlen(txxt); i < n; i++)
{
// int letter = 'A'; i.e. 65
// Must Preserve Case
//~ printf("%c---\n", txxt[i]);
//if lower start from 'a'or 97
if ( islower(txxt[i]) )
{
//~ printf("islower\n");
letter = txxt[i];
cipherNum = txxt[i];
//~ printf("%c is the letter\n", letter + salt);
//~ printf("%d is the cipherNumz\n", cipherNum);
if ((letter + salt) > 122)
{
//~ printf("letter + salt is > 90: %d \n", letter+salt);
cipherNum = (96 + (cipherNum + salt) % 122);
//~ printf("%c is the letters", cipherNum);
}
else
{
cipherNum = letter + salt;
}
cipher[i] = cipherNum ;
}
else if ( isupper(txxt[i]))
{
letter = txxt[i];
cipherNum = txxt[i];
//printf("%c is the letter\n", letter + salt);
//printf("%d is the cipherNumz\n", cipherNum);
if ((letter + salt) > 90)
{
//printf("letter + salt is > 90: %d \n", letter+salt);
cipherNum = (64 + (cipherNum + salt) % 90);
//printf("%c is the letters", cipherNum);
}
else
{
cipherNum = letter + salt;
}
//printf("%c\n", cipherNum);
cipher[i] = cipherNum ;
//printf("testing12\n");
}
else
{
cipher[i] = txxt[i];
}
//~
}
cipher[strlen(txxt) + 1] = '\0';
printf("%s\n", cipher);
return 0;
}
答案 0 :(得分:9)
如果您使用的是标准islower
和isalpha
,那么您应该看到顶部的某处
#include <ctype.h>
要发生这种情况。
答案 1 :(得分:1)
您的头文件似乎没有为这些函数声明原型,因此函数本身被隐式视为函数原型。如上所述,添加所需的标题。