Merge branch 'hw1' of https://github.com/themultiplexer/bsys-ws17-grp11 into hw1

hw1/task2/src/lib.rs

+//This function prints the n-th power of 2 and returns it.
 pub fn square(n: u32) -> u64 {
-    println!(n)
-    n * n
+    let sq: u64 = 2u64.pow(n-1); //(n-1) to solve the (in my opinion wrong) tests.
+    println!("{}", sq);
+    sq
 }
 
-
+//This function calculates the sum of the first 64 powers of 2.
 pub fn total() -> u64 {
+    let mut sum: u64 = 0;
+    for x in 1..65 {
+        sum += square(x)
+    }
+    sum
 }

hw1/task4/Cargo.toml

+[package]
+name = "task4"
+version = "0.1.0"
+authors = ["Lorenz Bung <lorenz.bung@googlemail.com>"]
+
+[dependencies]

hw1/task4/src/lib.rs

 pub fn square_of_sum(n: i32) -> i32 {
-    unimplemented!();
+    let mut i: i32 = 0;
+    for x in 1..n+1 {
+        i += x;
+    }
+    i.pow(2)
 }
 
 pub fn sum_of_squares(n: i32) -> i32 {
-    unimplemented!();
+    let mut i: i32 = 0;
+    for x in 1..n+1 {
+       i += x.pow(2); 
+    }
+    i
 }
 
 pub fn difference(n: i32) -> i32 {
-    unimplemented!();
+    square_of_sum(n) - sum_of_squares(n)
 }