Question

I need to execute a perl script from my c++ code. This is done with system().
Now I need to pass the second argument from my code:

int main(int argc, char * argv[])

into my system() like this:

char *toCall="perl test.pl "+argv[1];
system(toCall);

Now it brings the error: “invalid operands of types ‘const char [14]’ and ‘char**’ to binary ‘operator+’”

What am I doing wrong?

Answer 1

Use std::string, like

std::string const command = std::string( "perl test.pl " ) + argv[1];
system( command.c_str() );

You cannot add two raw pointers.

But std::string provides an overload of the + operator.