Which of the following is NOT a main data type in C?

In C programming, the main data types are fundamental types that the language provides to represent various kinds of data. The types include int, float, and char, which serve specific purposes in terms of storing numerical values, floating-point values, and single character representations respectively.

The int type is used for integer values, while float handles decimal numbers, and char is used to store single characters. These types are defined by the C language standards and are essential for performing basic operations.

On the other hand, string is not a primary data type in C. While C does allow for working with strings, they are implemented using arrays of characters and are terminated by a null character (\0). Therefore, in C, strings are typically handled using arrays or pointers, rather than being a built-in data type like the others mentioned. This distinction is critical for understanding how strings are managed in C and clarifies why string is regarded as an absence of a main data type in this context.