What is difference between string str="string"; and char str[50]={'s','t','r','i','n','g'}; ?

Answer 1

Atleast one difference is that you can change characters of an array, but you can't change strings after creation.

Answer 2

Char array is just an array which contains different characters. Char is a primitive data type.
String is 0 or more characters. For example in java string is a class.