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Union is an user defined datatype in C programming language . It is a collection of variables of different datatypes in the same memory location. We can define a union with many members, but at a given point of time only one member can contain a value.

To print any string in C programming, use printf() function with format specifier %s as shown here in the following program. To scan or get any string from user, you can use either scanf() or gets() function.

In computing, a hash table (also hash map) is a data structure used to implement an associative array, a structure that can map keys to values. A hash table uses a hash function to compute an index into an array of buckets or slots, from which the correct value can be found.

A nested structure in C is a structure within structure . One structure can be declared inside another structure in the same way structure members are declared inside a structure. Syntax: struct name_1.

struct keyword is used to define a structure . struct defines a new data type which is a collection of primary and derived data types.