Undefined reference error for printf in Kernel Main process

[Mehmetdev1]

Code: Select all

#include <stdio.h>

void print(char* str)
{

 unsigned short* VideoMemory = (unsigned short*)0xb8000;

 for(int i = 0; str[i] != '\0'; ++i)
 VideoMemory[i] = (VideoMemory[i] & 0xFF00) | str[i];

}

extern "C" void kernelMain(void* multiboot_structure, unsigned int magicnumber)
{
 printf("Kapiler İsletim Sistemi");

 while(1);

{

}

}

Hello, I am getting an undefined reference error for printf in the Kernel Main process, I will post the codes and the screenshot of the error here.

[kzinti]

That's because you didn't implement printf() anywhere, you implemented print().

[Mehmetdev1]

How can I implement printf?

[Octocontrabass]

Are you sure you want to implement printf? It looks like you want to call print instead of printf.

[Mehmetdev1]

I want to call printf, not print.

[Octocontrabass]

Why do you want to call printf instead of the print function you've already written?

[Mehmetdev1]

If I Call the Print Function, It Gives an Error.

[Octocontrabass]

What is the error?

[Mehmetdev1]

Thank goodness I solved the error, the code to solve the error:

Code: Select all

#include <stdio.h>

void print(char* str)
{

unsigned short* VideoMemory = (unsigned short*)0xb8000;

for(int i = 0; str[i] != '\0'; ++i)
VideoMemory[i] = (VideoMemory[i] & 0xFF00) | str[i];

}

extern "C" void kernelMain(void* multiboot_structure, unsigned int magicnumber)
{
print("Kapiler İsletim Sistemi");

while(1);

{

}

}