Fix various typos

wiki/cpp-tutorial/debugging-gdb.md

@@ -80,7 +80,7 @@ gdb program
 - `run, r` - start the program execution inside of gdb
 - `start` - creates a temporary breakpoint at `main()` and start execution
 
-### Launch the executable and step thru the program
+### Launch the executable and step through the program
 
 - `next, n` - executes the next line of code
 - `nexti, ni` - executes the next instruction
@@ -108,7 +108,7 @@ Lets start with the obligatory hello world example:
 ```cpp:line-numbers
 #include <iostream>
 int main() {
-    std::cout << "Hello, GDB!";
+    std::cout << "Hello, GDB!" << std::endl;
     return 0; /* break here */
 }
 ```
@@ -130,7 +130,7 @@ program `start`:
 Temporary breakpoint 1 at 0x123456: file main.cpp, line 3.
 Starting program: /file/path/to/main.out
 
-Temporary breakpoint 1, main () at main1.cpp:3
+Temporary breakpoint 1, main () at main.cpp:3
 3           std::cout << "Hello, GDB!" << std::endl;
 ```
 

wiki/cpp-tutorial/debugging.md

@@ -45,7 +45,7 @@ test for different scenarios. Main features of a debugger are:
 - Examining the suspended program
 - Examining the call stack
 - Inspecting memory
-- Stepping trough the program
+- Stepping through the program
 - Examine core dump files
 - Modifying the state of the program
 

wiki/cpp-tutorial/language-basics.md

@@ -81,7 +81,7 @@ int foo = 0;   // declaration statement
 foo = foo + 2; // expression statement
 ```
 
-The above snippet creates `foo` with an initial value of `1`, then evaluates `foo + 2` before assigning the value back
+The above snippet creates `foo` with an initial value of `0`, then evaluates `foo + 2` before assigning the value back
 to the variable `foo`.
 
 ## Identifiers
@@ -294,7 +294,7 @@ together and write a simple program that changes Fahrenheit to Celsius.
 
 The equation to convert the two is very simple: $C = (F - 32) / (9 / 5)$.
 
-Because temperature is not a integer value, but a real number, we will use `double` to store our variables.
+Because temperature is not an integer value, but a real number, we will use `double` to store our variables.
 
 ```cpp
 int main() {