add void to no-parm function declrs

Author: capnramses

ch01_01_unit_test/main.c

@@ -9,7 +9,7 @@ Repository: https://github.com/capnramses/pro_programming_tools_c_cpp
 /* trivial function to add two integers */
 int my_adder( int a, int b ) { return a + b; }
 
-void run_tests() {
+void run_tests( void ) {
   int a_inputs[3]         = { 0, 100, -100 };
   int b_inputs[3]         = { 0, -200, 200 };
   int expected_outputs[3] = { 0, -100, 100 };

ch04_00_deliberate_crash/main.c

@@ -44,12 +44,12 @@ Getting the list of strings in the stack trace requires system-specific calls.
 
 int* ptr = NULL;
 
-void function_that_crashed() {
+void function_that_crashed( void ) {
   int value = *ptr; // should crash here. dereferencing a null pointer.
   printf( "value %i\n", value );
 }
 
-void some_intermediate_function() { function_that_crashed(); }
+void some_intermediate_function( void ) { function_that_crashed(); }
 
 int main( void ) {
   some_intermediate_function();

ch05_00_gprof/main.c

@@ -15,21 +15,21 @@ To tabulate profiling results after running:
 
 #include <stdio.h>
 
-void great_greatchild() {
+void great_greatchild( void ) {
   for ( int i = 0; i < 0x10000000; i++ ) { ; }
 }
 
-void grandchild() {
+void grandchild( void ) {
   for ( int i = 0; i < 0x1000000; i++ ) { ; }
   great_greatchild();
 }
 
-void child() {
+void child( void ) {
   for ( int i = 0; i < 0x100000; i++ ) { ; }
   grandchild();
 }
 
-void parent() {
+void parent( void ) {
   for ( int i = 0; i < 0x1000; i++ ) { ; }
   child();
 }