c截取

#include <stdio.h>

int main()
{
    const char *bb="abcdef;dsfads";
    char msg[50];
    char *nn=msg;

    while((*nn++=*bb)!=';' && *bb++ );/*其实就这么两句*/
    *(--nn)='\0';

    puts(msg);
    system("pause");
    return 0;
};

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

int main()
{
    const char *bb="abcdef;dsfads";
    char msg[50];

    sscanf(bb,"%[^;]%*s",msg);/*其实就这么一句*/

    puts(msg);
    system("pause");
    return 0;
};

#include<stdio.h>
#include <string.h>
int main()
{
    char *path="d:\\root\\dest\\a.txt";
    char dir[120];
    int len=strlen(path);
    int i;
    for (i=len-1;i>=0;--i)
    {
        if (path[i]=='\\')
        {
        	break;
        }
    }
    if (i>=0) 
	{
        dir[i+1]='\0';
        strncpy(dir,path,i+1);
        printf("%s",dir);
    }
    return 0;
}