using define typedef

The `typedef` keyword in C is used to create a new type alias for an existing data type. It allows you to define alternative names for types, making the code more readable and easier to maintain.

Here's an example of how to use `typedef`:

typedef int myInt;  // create an alias "myInt" for the type "int"
typedef float realNum;  // create an alias "realNum" for the type "float"

int main() {
    myInt x = 5;
    realNum y = 3.14;

    printf("%d\n", x);
    printf("%f\n", y);

    return 0;
}

In this example, we defined `myInt` as an alias for `int` and `realNum` as an alias for `float`. We can then use these aliases instead of the original types when declaring variables. This makes the code more self-explanatory and easier to understand.