1.) What is the size of the string "Hello World"? What is the length of this array named s?

char s[ ] = "Hello world";

a) Write a c++ program that returns the length of s to support your answer.

b) Define a string instance called s1, copy the string "Hello World" in s1 then use the string length function to determine the length of s1 and display it

I am lost, mostly on parts a and b. Any help would be appreciated. Thanks!