passing strings and using strlen

Unregistered · 09-15-2001

I have a string in main and I want to be able to determine it's length in function Foo.

void Foo(string S);

main()
{
char S [15];

Foo(s);
}

void Foo(string S)
{
int Length;

Length = strlen(S);
}

When I complile, I keep getting this error message: cannot convert 'S' from type 'string' to 'const char *'

What am I doing wrong?

Thanks,
Buzz

**Zach L.** · 09-15-2001

You can either use a pointer to an array of characters (char* or char[]) or the standard STL string class.

If you want to use the first method, then include the <cstring> header, and in the std namespace is strlen(). For example:

Code:

#include <cstring>
using namespace std;

int main()
{
    char* str = "Hello!";
    int length = strlen(str);
    return 0;
}

The other option uses the string from the <string> header, and that class has its own length function.

Code:

#include <string>
using namespace std;

int main()
{
    string str = "Hello!";
    int length = str.length();
    return 0;
}

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