<p>The error message "undefined symbols for architecture arm64: '_main', referenced from: implicit entry/start for main executable ld: symbol(s) not found for architecture arm64" is a linker error that occurs when the linker (in this case, the clang linker) is unable to find the main function in your code.</p>
<p>The main function serves as the entry point for your program, and when it is missing or not correctly defined, the linker is unable to link all the necessary object files together and create the final executable.</p>
<p>Here's an example to illustrate the error:</p>
<pre>
<code>
<span style="color: blue;">#include <iostream></span>
int add(int a, int b) {
return a + b;
}
int main() {
std::cout << "Hello, World!";
int sum = add(3, 4);
std::cout << "Sum: " << sum;
return 0;
}
</code>
</pre>
<p>In the above example, the code defines an add function to sum two integers, and the main function that prints "Hello, World!" and calls the add function. However, the code is missing the necessary include statement for the iostream library, which is required for the std::cout statements.</p>
<p>To fix the error, you need to include the iostream header at the top of the file. Here's the corrected code:</p>
<pre>
<code>
#include <iostream>
int add(int a, int b) {
return a + b;
}
int main() {
std::cout << "Hello, World!";
int sum = add(3, 4);
std::cout << "Sum: " << sum;
return 0;
}
</code>
</pre>
<p>After including the iostream header, the code should compile and link successfully without any linker errors.</p>
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