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

int main()
{
    FILE *fp;
    char str[3][10],temp[10];
    int i,j,k,n=3;
    printf("please input the string :\n ");
    for( i=0; i<n; i++ )
        gets(str[i]);
    for( i=0; i<n-1; i++ )
    {
        k=i;
        for( j=i+1; j<n; j++ )
            if( strcmp( str[k],str[i] )>0 )
                k=j;
            if( k!=i )
            {
                strcpy( temp,str[i] );
                strcpy( str[i],str[k] );
                strcpy( str[k],temp );
            }
            if ( ( fp=fopen("F:\\CC\\string.dat","w") ) == NULL )
            {
                printf(" can't open the file \n ");
                exit (0);
            }
            printf("\n The new sequence:\n");
            for( i=0; i<n; i++ )
            {
                fputs(str[i],fp);
                fputs("\n",fp);
                printf("%s \n",str[i]);
            }
    }
    return 0;
}
运行结果：
please input the string :
 china
canada
india
 can't open the file
 Press any key to continue