删除空格

remove_space.c

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
int strlen(char * str)
{
    int i=0;
    while(str[i]!='\0')
        i++;
    return i+1;
}
int strcpy(char *Rstr, char *Dstr)
{
    for(int i=0;i<strlen(Rstr);i++)
    {
        Dstr[i]=Rstr[i];
    }
    return 0;
}
int remove_space(char *Pstr, int len)
{
    int num=0;
    int i;
    for(i=0;i<len;i++)
    {
        if(Pstr[i] == ' ')
        {
            num++;
        }
        else
        {
            printf("str::%c--->%c\n",Pstr[i-num],Pstr[i]);
            Pstr[i-num] = Pstr[i];
        }
    }
    Pstr[len-num]='\0';
    return num;
}

int main(int argc, char *argv[])
{
    assert(argc!=1);
    char * str = argv[1];
    int len = strlen(str);
    char * string = (char *) malloc(len);
    strcpy(str, string);
    int space = remove_space(string, len);
    printf("space:%d\n", space);
    printf("string:%s\n", string);
    return 0;
}