Question

用户必须插入一个字符串，在该字符串中我必须计算不同的符号。例如：＆＃34; Ellipse＆＃34;有6个不同的符号，而整个单词有7个符号，不同的符号是：＆＃34; E，l，i，p，s，e＆＃34;。

我能够编写一个能够正确计算符号的代码，但是编写这些符号时我遇到了很大的问题！请注意：我不允许使用任何其他库（例如string.h）。

#include <stdio.h>
#define MAX 256

        int main()
    {

        int VOwels=0,diff=0,counter,i,j;
        char vowels[]={'a','e','i','o','u','A','E','I','O','U'};

        char sentence[MAX], diff_symbols[MAX];

        printf("\nInsert sentence: ");
        gets(sentence);

        for(i=0;sentence[i]!='\0';i++){
            if(i==0){
                diff_symbols[i]=sentence[i];//first symbols is always saved
                diff++;
            }
            counter=0;//Reset counter
            if(i!=0){
                for(j=0;diff_symbols[j]!='\0';j++){//checking if the symbol was already observed
                    if(sentence[i]==diff_symbols[j]){
                        counter++;
                        break;//as soon as we find the same symbol we stop checking
                        }
                }
                if(counter==0){//if we haven't found that symbol in the diff_symbols yet than
                    diff_symbols[j]=sentence[i];
                    diff++;
                    }
            }
            for(j=0;vowels[j]!='\0';j++){//counting vowels
                if(sentence[i]==vowels[j]){
                    VOwels++;
                    break;
                }
            }
        }
        printf("Inserted sentence is: %s",sentence);
        printf("\nThere are %d symbols in the string\n",i);
        printf("There are %d different symbols in the string. The symbols are: %s\n",diff,diff_symbols);
        printf("Number of vowels %d.\n",VOwels);
        return 0;
    }

结果几乎是好的。数字匹配，除非我试图写出所有不同的符号时发生了一些非常奇怪的事情 - 一些不应该存在的奇怪符号。

有什么想法吗？：/

Answer 1

问题是diff_symbols未初始化。如果设置char diff_symbols[256]={0}，该程序可以正常工作。

一个更简单的算法是迭代字符串并打开diff_symbols的单元格，如果字符串中出现相应的字符。然后遍历数组并打印字符iff相应的单元格是否打开。

Answer 2

你在这里。：）

        $user = $this->getDoctrine()
            ->getRepository('Bundle:CusUser')
            ->findOneBy(
                array('username' => $user->getUsername(), 'email' => $user->getUsername(), 'password' => $user->getPassword())
            );

如果要输入

#include <stdio.h>

#define MAX 256

int main( void ) 
{
    const char *vowels = "aeiouAEU";
    char diff_symbols[MAX] = { '\0' };
    char sentence[MAX]; 

    size_t total_cnt, diff_cnt, vowels_cnt;
    size_t i;

    printf( "\nInsert sentence: " );
    fgets( sentence, MAX, stdin );

    total_cnt = diff_cnt = vowels_cnt = 0;

    for ( i = 0; sentence[i] != '\n' && sentence[i] != '\0'; i++ )
    {
        diff_symbols[( unsigned char )sentence[i]] = 1;
        size_t j = 0;
        while ( vowels[j] != '\0' && vowels[j] != sentence[i] ) ++j;
        vowels_cnt += vowels[j] != '\0';
    }

    if ( sentence[i] == '\n' ) sentence[i] = '\0';

    total_cnt = i;

    for ( i = 0; i < MAX; i++ ) diff_cnt += diff_symbols[i];

    printf( "\nInserted sentence is: %s\n", sentence );
    printf( "There are %zu symbols in the string\n", total_cnt );
    printf( "There are %zu different symbols in the string.", diff_cnt ); 
    printf( "The symbols are: " );
    for ( i = 0; sentence[i] != '\0'; i++ ) 
    {
        unsigned char c = sentence[i];
        if ( diff_symbols[c] ) 
        {
            diff_symbols[c] = 0;
            putchar( sentence[i] );
        }           
    }
    printf( "\n" );
    printf( "Number of vowels %zu.\n", vowels_cnt );

    return 0;
}

然后程序输出看起来

Ellipse

此外，您可以添加不计算例如空白字符的代码。

计算c中字符串中的不同符号

2 个答案: