C++ Primer上的一个程序
#include <iostream>
#include <vector>
#include <string.h>
using namespace std;
#include <ctype.h>
const char *const program_name= "comline ";
const char *const program_version= "version 0.01 (08/07/97) ";
inline void usage(int exit_value=0)
{
cerr < < "usage:\n "
< <program_name < < " "
< < "[-d] [-h] [-v] \n\t "
< < "[-o output_file] [-l limit] \n\t "
< < "file_name\n\t[file_name [file_name [...]]]\n\n "
< < "where [] indicates optional option:\n\n\t "
< < "-h: help.\n\t\t "
< < "generates this message and exits\n\n\t "
< < "-v: version.\n\t\t "
< < "prints version information and exits\n\n\t "
< < "-d: debug.\n\t\tturns debugging on\n\n\t "
< < "-l: limit \n\t\t "
< < "limit must be a non-negative integer\n\n\t "
< < "-o ofile\n\t\t "
< < "file within which to write out results\n\t\t "
< < "by default,results written to standard output\n\n "
< < "file_name\n\t\t "
< < "the name of the actual file to process\n\t\t "
< < "at least one file_name is required --\n\t\t "
< < "any number may be specified\n\n "
< < "examples:\n\t\t "
< < "$command chapter7.doc\n\t\t "
< < "$command -d -l 1024 -o test_7_8 "
< < "chapter7.doc chapter8.doc\n\n ";
exit(exit_value);
}
int main(int argc,char* argv[])
{
bool debug_on=false;
bool ofile_on=false;
bool limit_on=false;
int limit=-1;string ofile;
std::vector <string,std::allocator> file_names;
cout < < "illustration of handling command line arguments:\n "
< < "argc: " < <argc < <endl;
for(int ix=1;ix <argc;++ix)
{
cout < < "argv[ " < <ix < < "]; "
< <argv[ix] < <endl;
char *pchar=argv[ix];
switch(pchar[0])
{case '- ':
{
cout < < "case \ '-\ ' found\n ";
switch(pchar[1])
{
case 'd ':
cout < < "-d found: "
< < "debugging turned on\n ";
debug_on=true;
break;
case 'v ':
cout < < "-v found: "
< < "version into displayed\n ";
cout < <program_name
< < ":: "
< <program_version
< <endl;
return 0;
case 'h ':
cout < < "-h found: "
< < "help information\n ";
usage();
case 'o ':
cout < < "-o found: output file\n ";
ofile_on=true;
break;
case 'l ':
cout < < "-l found: "
< < "resource limit\n ";
limit_on=true;
break;
default:
cerr < <program_name
< < ":error: "
< < "unrecognized option:- "
< <pchar < < "\n\n ";
usage(-1);
}
break;
}
default:
cout < < "default nonhyphen argument: "
< <pchar < <endl;
if(ofile_on){
ofile_on=false;
ofile=pchar;
}
else
if(limit_on){
limit_on=false;
limit=atoi(pchar);
if(limit <0){
cerr < <program_name
< < ":error: "
< < "negative value for limit.\n\n ";
usage(-2);
}
}
else file_names.push_back(string(pchar));
break;
}
}
if(file_names.empty()){
cerr < <program_name
< < ":error: "
< < "no file specified for processing.\n\n ";
usage(-3);
}
if(limit!=-1)
cout < < "User-specified limit: "
< <limit < <endl;
if(!ofile.empty())
cout < < "User-specified output file: "
< <ofile < <endl;
cout < <(file_names.size()==1? "File ": "Files ")
< < "to be processed are the following:\n ";
for(int inx=0;inx <file_names.size();++inx)
cout < < "\t " < <file_names[inx] < <endl;
}
会报错，怎么修改？？
------解决方案--------------------
先把include文件名的.h删了再说
[解决办法]
#include <iostream>
#include <vector>
#include <string>
using namespace std;
#include <ctype.h>
const char *const program_name= "comline ";
const char *const program_version= "version 0.01 (08/07/97) ";
inline void usage(int exit_value=0)
{
cerr < < "usage:\n "
< <program_name < < " "
< < "[-d] [-h] [-v] \n\t "
< < "[-o output_file] [-l limit] \n\t "
< < "file_name\n\t[file_name [file_name [...]]]\n\n "
< < "where [] indicates optional option:\n\n\t "
< < "-h: help.\n\t\t "
< < "generates this message and exits\n\n\t "
< < "-v: version.\n\t\t "
< < "prints version information and exits\n\n\t "
< < "-d: debug.\n\t\tturns debugging on\n\n\t "
< < "-l: limit \n\t\t "
< < "limit must be a non-negative integer\n\n\t "
< < "-o ofile\n\t\t "
< < "file within which to write out results\n\t\t "
< < "by default,results written to standard output\n\n "
< < "file_name\n\t\t "
< < "the name of the actual file to process\n\t\t "
< < "at least one file_name is required --\n\t\t "
< < "any number may be specified\n\n "
< < "examples:\n\t\t "
< < "$command chapter7.doc\n\t\t "
< < "$command -d -l 1024 -o test_7_8 "
< < "chapter7.doc chapter8.doc\n\n ";
exit(exit_value);
}
int main(int argc,char* argv[])
{
bool debug_on=false;
bool ofile_on=false;
bool limit_on=false;
int limit=-1;string ofile;
std::vector <string> file_names;
cout < < "illustration of handling command line arguments:\n "
< < "argc: " < <argc < <endl;
for(int ix=1;ix <argc;++ix)
{
cout < < "argv[ " < <ix < < "]; "
< <argv[ix] < <endl;
char *pchar=argv[ix];
switch(pchar[0])
{case '- ':
{
cout < < "case \ '-\ ' found\n ";
switch(pchar[1])
{
case 'd ':
cout < < "-d found: "
< < "debugging turned on\n ";
debug_on=true;
break;
case 'v ':
cout < < "-v found: "
< < "version into displayed\n ";
cout < <program_name
< < ":: "
< <program_version
< <endl;
return 0;
case 'h ':
cout < < "-h found: "
< < "help information\n ";
usage();
case 'o ':
cout < < "-o found: output file\n ";
ofile_on=true;
break;
case 'l ':
cout < < "-l found: "
< < "resource limit\n ";
limit_on=true;
break;
default:
cerr < <program_name
< < ":error: "
< < "unrecognized option:- "
< <pchar < < "\n\n ";
usage(-1);
}
break;
}
default:
cout < < "default nonhyphen argument: "
< <pchar < <endl;
if(ofile_on){
ofile_on=false;
ofile=pchar;
}
else
if(limit_on){
limit_on=false;
limit=atoi(pchar);
if(limit <0){
cerr < <program_name
< < ":error: "
< < "negative value for limit.\n\n ";
usage(-2);
}
}
else file_names.push_back(string(pchar));
break;
}
}
if(file_names.empty()){
cerr < <program_name
< < ":error: "
< < "no file specified for processing.\n\n ";
usage(-3);
}
if(limit!=-1)
cout < < "User-specified limit: " < <limit < <endl;
if(!ofile.empty())
cout < < "User-specified output file: " < <ofile < <endl;
cout < <(file_names.size()==1? "File ": "Files ") < < "to be processed are the following:\n ";
for(int inx=0;inx <file_names.size();++inx)
cout < < "\t " < <file_names[inx] < <endl;
}
