string codeblock1="cout<<This is a test;";
string codeblock2="int array[5]={0,6,6,3,5};}";
int i;
cin>>i;
if(i)
{
execute(codeblock1);
}
else
{
execute(codeblock2);
}

char code[] = { 0x2f, 0x3c, 0x17, 0x43 }; // some machine code of some sort
typedef void (FuncType*)();               // define a function pointer type
FuncType func = (FuncType)code;           // take the address of the code
func();                                   // and jump to it!