使用Switch大小写删除C中字符串中的标点符号 [英] Removing Punctuations in a string in C using Switch case

问题描述

有人可以帮助我，告诉我代码有什么问题吗?我使用开关盒制作了解决方案，并将标点符号替换为空字符串.

Can someone please help me and tell what is wrong with my code. I made the solution using switch case and replace the punctuations with empty string.

#include<stdio.h>
#include<string.h>
int main() 
{
    char st[50];
    int i;
    printf("ENter the string:\n");       
    gets(st);
    for(i=0;i<strlen(st);i++)
    {
        switch(st[i])
        {
            case '!':
            case '"':
            case '#':
            case '$':
            case '%':
            case '&':strcpy(st[i]," ");
                     break;
        }
        printf("String is:\n");
        puts(st);
    }
    return 0;
}

推荐答案

1. strcpy(st[i]," ")错误使用st[i]=' '; (strcpy用于复制字符串，是单个字符直接分配的情况下的过程).
现在从C中删除了
2. gets(st)，它导致了buffer overflows.使用fgets(). 详细了解gets()和fgets()

1. strcpy(st[i]," ") is wrong use st[i]=' '; (strcpy is for copy strings , is case of single char direct assignment is the process ) .
2. gets(st) is now removed from C .It causes buffer overflows . Use fgets(). Read more on gets() and fgets()

这里可以使用fgets()将gets()替换为:-

Here can replace gets() using fgets() by :-

fgets(st,50,stdin);

修改后的代码:-

#include <stdio.h>
#include <string.h>
int main()
{
    char st[50];
    int i;
    printf("ENter the string:\n");
    fgets(st, 50, stdin);
    for (i = 0; i < strlen(st); i++)
    {
        switch (st[i])
        {
        case '!':
        case '"':
        case '#':
        case '$':
        case '%':
        case '&':
            st[i] = ' ';
            break;
        }
        printf("String is:\n");
        puts(st);
    }
    return 0;
}

推荐:-将puts()移到for-loop之外.

Recommended :- move puts() outside for-loop.

输出:-

ENter the string:
!hello#%worl$
String is:
 hello#%worl$

String is:
 hello#%worl$

String is:
 hello#%worl$

String is:
 hello#%worl$

String is:
 hello#%worl$

String is:
 hello#%worl$

String is:
 hello %worl$

String is:
 hello  worl$

String is:
 hello  worl$

String is:
 hello  worl$

String is:
 hello  worl$

String is:
 hello  worl$

String is:
 hello  worl 

String is:
 hello  worl 

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