Lab Activities $($see the hints below$)1.$ Write, compile and run the "hello, world" program$\mathrm{.}2.$ Write, compile and run a program which does a vector addition$\mathrm{.}3.$ Write, compile and run a program which does a matrix multiplication$\mathrm{.}4.$ Write, compile and run a program which does the pi computation.Exercises$1.$ Write a program that does the following:$($a$)$ Compute the average of array elements.$($b$)$ Sum two numbers, stored in a and b$\mathrm{.}2.$ Write a program to find the max number in the given array.