Differentiate between the following with the help of suitable example for each :
a. Co-routines and subroutines
b. Co-routines and threads

a. Co-routines and Subroutines:

Subroutines:
A subroutine, also known as a function or method in programming, is a block of code designed to perform a specific task. It is a self-contained unit of code that can be called from other parts of the program, and it usually takes parameters and returns a value. Subroutines are used to break down a program into smaller, more manageable pieces, promoting code reusability and modularity.

Example in C:
```c
#include <stdio.h>

// Subroutine to calculate the square of a number
int square(int num) {
    return num * num;
}

int main() {
    int result = square(5);
    printf("Square: %d\n", result);
    return 0;
}
```

Co-routines:
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