[英]Why won't this C++ program compile?
这是我要编译的程序。
#include <iostream>
#include <string>
#include <vector>
#include <unistd.h>
using namespace std;
vector<string> paramlist;
const char *programname = "abc";
const char **args = new const char* [paramlist.size()+2]; // extra room for program name and sentinel
args [0] = programname; // by convention, args[0] is program name
for (int j = 0; j < paramlist.size()+1; ++j) // copy args
args [j+1] = paramlist[j] .c_str();
args [paramlist.size()+1] = NULL; // end of arguments sentinel is NULL
execv (programname, (char **)args);
当我尝试编译它时,出现以下错误消息:
test.cpp:11: error: expected constructor, destructor, or type conversion before ‘=’ token
test.cpp:12: error: expected unqualified-id before ‘for’
test.cpp:12: error: expected constructor, destructor, or type conversion before ‘<’ token
test.cpp:12: error: expected unqualified-id before ‘++’ token
test.cpp:15: error: array bound is not an integer constant
test.cpp:15: error: expected constructor, destructor, or type conversion before ‘=’ token
test.cpp:17: error: expected constructor, destructor, or type conversion before ‘(’ token
您至少需要一个int main
函数 。
您的程序包含代码,但需要包含在函数中。 尝试在using namespace std;
之后包装所有代码using namespace std;
符合int main
类的函数。 Google为任何“ Hello world” C ++示例提供了示例。
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