C删除字符

[CloudStrifers]

编写一函数delchar（s，c）该函数将字符串s中出现的所有c字符删除，不管有无都要做出相应说明，例如删除了几个c字符。

[贾囧雷]

[bdmh]

void delchar(char *p)
{
	int i = 0,j=0;
	char *t = new char[strlen(p)];
	while(*p!=0)
	{
		if (*p == 'c')
		{
			i+=1;
		}
		else
		{
			t[j] = *p;
			j+=1;
		}
		p++;
	}
	t[j+1] = 0;
	printf("%s",t);
	printf("%d",i);
}
void main()
{
	char *p = "abccdecab";
	delchar(p);
}

[赵4老师]

[Quote=引用 2 楼 bdmh 的回复:]
C/C++ code

void delchar(char *p)
{
int i = 0,j=0;
char *t = new char[strlen(p)];
while(*p!=0)
{
if (*p == 'c')
{
i+=1;
}
else
……
[/Quote]
请教有new没delete会不会产生内存泄漏？

[我真的是琦琦]

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define LIM 20

void Del_str (char *srcStr, char * objStr,int len,int* count);

int main (void)
{
    char str[LIM] = "TheClanguage";
    char *p;
    int n;
	int count = 0;
    n = strlen (str);
	p = (char*)malloc((n+1)*sizeof(char));
	memset(p,0,sizeof(p));
    Del_str(str,p,n,&count);
	printf("%s\n",p);
	printf("%d\n",count);
	free(p);
    return 0;
}

void Del_str (char *srcStr,char* objStr,int len,int* count)
{
	int i = 0,j=0;
    int index = 0;
	index = *count;
    for (i = 0; i < len;i++)
    {
        if( (*srcStr == 'c') || (*srcStr == 'C'))
		{
			index++;
		}
		else
		{
            objStr[j] = *srcStr;
			j++;
		}  
		*srcStr++;
    }
    objStr[j] = '\0';
	*count = index;
}

(*^__^*) 嘻嘻……

[海盗医生]

int delchar(char *szSour, char *szOut, char aDel)
{
	char *cpSour = szSour;
	char *cpOut  = szOut;
	int iCnt=0;
	for(;*cpSour!='\0';cpSour++)
	{
		if(*cpSour==aDel)
		{
			iCnt++;
		}
		else
		{
			*cpOut++=*cpSour;
		}
	}
	return iCnt;
}

调用方法：
	char *szSour="abcdckkkdcddc";
	char szOut[32]={0};
	int iDelCnt = delchar(szSour, szOut, 'c');

相比上边几种，这个应该更通用一下，也更加简洁

[aa_niaofang]

[Quote=引用 3 楼 zhao4zhong1 的回复:]

引用 2 楼 bdmh 的回复:
C/C++ code

void delchar(char *p)
{
int i = 0,j=0;
char *t = new char[strlen(p)];
while(*p!=0)
{
if (*p == 'c')
{
i+=1;
}
else
……

请教有new没delete会不会产生内存泄漏？
[/Quote]
这么短的程序一般不会，程序结束时，此段内存会被 回收（具体是编译器 还是 操作系统干的 不太清楚），如果比较大的程序，这段程序可能会有问题

[张小毛]

下班喽，下班喽

#include "stdio.h"

int delchr(char *p, char c)
{
    int ir = 0, i = 0;
    char *temp = p, *ch = p;
    for(i = 0; i < strlen(p); i++)
    {

        if(temp[i] == c)
        {
            ir++;
            *ch = temp[i];
        }
        else
        {
            *ch = temp[i];
            ch++;
        }
    }

    memset(ch, 0, ir);
    return ir;
}
int main()
{
    char *constp = "aabbccfasdgsjasbgbweoiueiasdfbaadkfkbbvaljfbvbafabf", *p;

    char c = 'b';
    p = (char*)malloc(strlen(constp)+1);
    strcpy(p, constp);

    printf("string(%s) has %d char(%c),and has been deleted!\n", p, delchr(p, c), c);
    printf("result string = %s", p);
    free(p);
    getch();
    return 1;
}

[AnYidan]

作业帖？
要求两个输入参数

对删除字符的说明放在 函数中好，还是返回好？

[黑夜de星辰]

5楼哥们的写法，欣赏

[陈思有]

#include <stdio.h>


int delchar( char *str,char c );

void main()
{
	int n;
	char str[30];
	char c;
	gets(str);
	printf("insert the char:\n");
	c = getchar();  
	n=delchar( str,c );
	printf("%s\n",str);
	printf("%d\n",n);
}

int delchar( char *str, char c )
{
	int n=0,i,j;

	for ( i=0; *(str+i)!='\0'; i++ )
	{
		if ( *(str+i) == c )
		{
			n++;
			for ( j=i; *(str+j)!='\0'; j++ )
			{
				*(str+j) = *(str+j+1);
			}
		}
	}		
	return( n );
}

[abcdef0966]

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

int del_char(char* src, char c)
{


if ( NULL == src)
{
fprintf(stderr, "del_char failed: invalid input.\n");
return -1;
}

char* pchTemp = (char*)malloc(strlen(src) + 1);
if ( NULL == pchTemp)
{
fprintf(stderr, "del_char failed: malloc failed\n");
return -1;
}

int num = 0;
int i = 0;
int j = 0;
while ( src[i] != '\0')
{
if ( src[i] != c)
{
pchTemp[j++] = src[i++];
}
else
{
i++;
num++;
}
}

pchTemp[j] = '\0';
if ( 0 != num)
{
strncpy(src, pchTemp, strlen(pchTemp) + 1);
}

free(pchTemp);

return num;
}

int main(int argc, char* argv[])
{
if ( 3 != argc)
{
fprintf(stderr, "Usage: %s [src] [c]\n", argv[0]);
return -1;
}
char szSrc[512] = {0};
snprintf(szSrc, sizeof(szSrc), "%s", argv[1]);

char c = argv[2][0];

int num = 0;

if ( (num = del_char(szSrc, c)) < 0)
{
return -1;
}
else
{
printf("num: %d after del %c: %s\n", num, c, szSrc);
return 0;
}

return 0;



}

的确没有五楼的哥们写得好

[abcdef0966]

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

int del_char(char* src, char c)
{


        if ( NULL == src)
        {
                fprintf(stderr, "del_char failed: invalid input.\n");
                return -1;
        }

        char* pchTemp = (char*)malloc(strlen(src) + 1);
        if ( NULL == pchTemp)
        {
                fprintf(stderr, "del_char failed: malloc failed\n");
                return -1;
        }

        int num = 0;
        int i = 0;
        int j = 0;
        while ( src[i] != '\0')
        {
                if ( src[i] != c)
                {
			pchTemp[j++] = src[i++];
                }
                else
                {
                        i++;
                        num++;
                }
        }

        pchTemp[j] = '\0';
        if ( 0 != num)
        {
                strncpy(src, pchTemp, strlen(pchTemp) + 1);
        }

        free(pchTemp);

        return num;
}

int main(int argc, char* argv[])
{
        if ( 3 != argc)
        {
                fprintf(stderr, "Usage: %s [src] [c]\n", argv[0]);
                return -1;
        }
        char szSrc[512] = {0};
        snprintf(szSrc, sizeof(szSrc), "%s", argv[1]);

        char c = argv[2][0];

        int num = 0;

        if ( (num = del_char(szSrc, c)) < 0)
        {
                return -1;
        }
        else
        {
                printf("num: %d after del %c: %s\n", num, c, szSrc);
                return 0;
        }

        return 0;



}

[如此美丽的你]

#include "stdio.h"

int delchr(char *p, char c)
{
    int ir = 0, i = 0;
    char *temp = p, *ch = p;
    for(i = 0; i < strlen(p); i++)
    {

        if(temp[i] == c)
        {
            ir++;
            *ch = temp[i];
        }
        else
        {
            *ch = temp[i];
            ch++;
        }
    }

    memset(ch, 0, ir);
    return ir;
}
int main()
{
    char *constp = "aabbccfasdgsjasbgbweoiueiasdfbaadkfkbbvaljfbvbafabf", *p;

    char c = 'b';
    p = (char*)malloc(strlen(constp)+1);
    strcpy(p, constp);

    printf("string(%s) has %d char(%c),and has been deleted!\n", p, delchr(p, c), c);
    printf("result string = %s", p);
    free(p);
    getch();
    return 1;
}