add void arg to main() params to keep clang happy

Author: capnramses

ch00_00_c/main.c

@@ -7,7 +7,7 @@ Repository: https://github.com/capnramses/pro_programming_tools_c_cpp
 #include <stdio.h>  /* contains printf() */
 #include <stdlib.h> /* contains malloc() and free() */
 
-int main() {
+int main( void ) {
   int* my_pointer = malloc( 16 * sizeof( int ) );           // C does not require you to explicitly cast the return type of malloc()
   if ( !my_pointer ) {                                      // if malloc() returned NULL then something went wrong
     fprintf( stderr, "ERROR: memory allocation failed\n" ); // print to standard error output stream

ch00_01_cpp_malloc/main.cpp

@@ -8,7 +8,7 @@ Repository: https://github.com/capnramses/pro_programming_tools_c_cpp
 #include <cstdio>  /* contains printf() */
 #include <cstdlib> /* contains malloc() and free() */
 
-int main() {
+int main( void ) {
   int* my_pointer = (int*)malloc( 16 * sizeof( int ) );     // C++ requires a cast on the return type of malloc()
   if ( !my_pointer ) {                                      // if malloc() returned NULL then something went wrong
     fprintf( stderr, "ERROR: memory allocation failed\n" ); // print to standard error output stream

ch00_02_cpp_new_delete/main.cpp

@@ -7,7 +7,7 @@ Repository: https://github.com/capnramses/pro_programming_tools_c_cpp
 */
 #include <iostream> // contains cout and cerr
 
-int main() {
+int main( void ) {
   int* my_pointer = new int[16];
   if ( !my_pointer ) {                                           // if malloc() returned NULL then something went wrong
     std::cerr << "ERROR: memory allocation failed" << std::endl; // print to standard error output stream

ch01_00_assertions/main.c

@@ -25,7 +25,7 @@ void my_str_truncate( char* str, int str_len, int str_index ) {
   str[str_index] = '\0';
 }
 
-int main() {
+int main( void ) {
   char name[10];
   strncpy( name, "anton", 10 );
   int new_length = 3;                      // try changing to a number >= 10

ch01_01_unit_test/main.c

@@ -19,7 +19,7 @@ void run_tests() {
   }
 }
 
-int main() {
+int main( void ) {
   run_tests();
   return 0;
 }

ch02_00_image_output/main.c

@@ -16,7 +16,7 @@ void draw_pixel( uint8_t* image_ptr, int width, int n_channels, int x, int y, ui
   image_ptr[pixel_idx + 2] = b;
 }
 
-int main() {
+int main( void ) {
   int width = 256, height = 128, n_channels = 3;
   // allocate memory. calloc() sets all our memory to zero (black)
   uint8_t* image_ptr = calloc( 1, width * height * n_channels );

ch02_01_image_pixel_functions/main.c

@@ -40,7 +40,7 @@ void write_ppm_bin( const char* filename, struct image_t image ) {
   fclose( f_ptr );
 }
 
-int main() {
+int main( void ) {
   struct image_t image;
   image.width = image.height = 512;
   image.n_channels           = 3;

ch02_02_image_write_chart/main.c

@@ -19,7 +19,7 @@ float lerpf( float x, float x_i, float x_f, float y_i, float y_f ) {
   return y_r * y + y_i;
 }
 
-int main() {
+int main( void ) {
   { // do an image with a chart
     const int width = 32, height = 24, n_channels = 3;
     struct image_t image = image_alloc( width, height, n_channels );

ch03_00_read_binary/main.c

@@ -10,7 +10,7 @@ Repository: https://github.com/capnramses/pro_programming_tools_c_cpp
 
 #define FILE_IN "in.ppm"
 
-int main() {
+int main( void ) {
   const char* filename = "in.ppm";
 
   FILE* fptr = fopen( filename, "rb" ); // ‘rb’ is ‘read binary’

ch03_01_read_write_ppm_binary/main.c

@@ -70,7 +70,7 @@ bool ppm_write( const char* filename, struct image_t image ) {
   return true;
 }
 
-int main() {
+int main( void ) {
   struct image_t image = ppm_read( FILE_IN );
   if ( !image.ptr ) {
     fprintf( stderr, "ERROR:reading image from `%s`\n", FILE_IN );