Thread: C-Style String and its Length

Hello folks,

I need to write a function that takes a C-style string as an input and returns its length. It must be done in a modular way by creating three separate files, stringLen.h, stringLen.C and useStringLen.C. useStringLen.C takes a command line argument and display its length by calling the function stringLen.

This is my header file.

Code:

//// stringLen.h ////


size_t strlen(const char * str);

My loop function to count the length of the string.

Code:

//// stringLen.C ////
#include "stringLen.h"


int stringLen(int a, int n)
{
    int i, ans=1
    for (i=1; i<=n; i++) { ans *=a; }
    return ans;
}

And my main function.

Code:

//// useStringLen.C ////
#include <iostream>
#include "stringLen.h"


int main(int argc, char *argv[])
{
    
return0;
}

I know there are errors but I am confused how to integrate the three. Can anyone help me out? I would appreciate it.

Thank you.

Why are you declaring your function as

Code:

size_t strlen(const char * str)

then implementing it as

Code:

int stringLen(int a, int n)

And does it really make sense to pass two integers to a function which is measuring the length of a string?

Ok, so I have made progress. I've built my header file, implementation file and the file that calls my implementation.

I've run into a single problem. I keep getting, Program received signal: "EXC_BAD_ACCESS" and then it highlights the while statement in my implementation file. Can anyone help me out?

Here is my code.

The header file.

Code:

int stringLen(const char str[]);

Implementation File.

Code:

#include "stringLen.h"


int stringLen(const char str[])
{
    int index = 0;
    while (str[index] != '\0')
        index++;
    return index;
}

The main function.

Code:

#include <iostream>
#include "stringLen.h"


usingnamespacestd;


int main(int argc, char *argv[])
{
    cout << "The string length is: " << stringLen(argv[1]) << endl;
return0;
}

Thank you!

Weird but it still worked. I'm still curious, why does that error come up? Thank you for your response.

Don't know if it's just a miscopy to the post but using g++:

Code:

// In main.cpp
usingnamespacestd; //gets error - in that cout and endl are not found.
return0;           // gets error - undifined variable.
// not checking argc just gets "unused parameter" warning.

// In stringLen.h
#include stringLen.h // will include itself ad infinitum at compile time
                     //  because of "stupid" compiler:)

After fixing them it runs ok.