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For struct see

https://www.geeksforgeeks.org/structures-c/

It just creates a new data type that is a grouping of other data types. Once a new variable of this new struct is declared then you access the parts within the struct using the dot (.) operator

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It just creates a new data type that is a grouping of other data types. Once a new variable of this new struct is declared then you access the parts within the struct using the dot (.) operator

One of the best website which I found For Programming.
Recursion in C