Refactor code formatting for consistency across multiple files

- Standardized indentation to 4 spaces in various C source files.
- Updated function definitions and return statements for improved readability.
- Ensured consistent use of braces and spacing in function bodies.
- Enhanced overall code clarity and maintainability.

Author: ohkimur

chapter_1/exercise_1_01/hello_world.c

@@ -1,7 +1,6 @@
 #include <stdio.h>
 
-int main(void)
-{
-  printf("hello, world\n");
-  return 0;
+int main(void) {
+    printf("hello, world\n");
+    return 0;
 }

chapter_1/exercise_1_02/printf_argument.c

@@ -1,7 +1,6 @@
 #include <stdio.h>
 
-int main(void)
-{
-  printf("hello, world\c");
-  return 0;
+int main(void) {
+    printf("hello, world\c");
+    return 0;
 }

chapter_1/exercise_1_03/fahrenheit_celsius.c

@@ -4,28 +4,26 @@
 // for fahr = 0, 20, ... 300
 // floating point version
 
-int main(void)
-{
-  float fahr, celsius;
-  int lower, upper, step;
+int main(void) {
+    float fahr, celsius;
+    int lower, upper, step;
 
-  lower = 0;
-  upper = 300;
-  step = 20;
+    lower = 0;
+    upper = 300;
+    step = 20;
 
-  // Printing a heading above the table
-  printf("Fahr\tCelsius\n");
-  printf("---------------\n");
+    // Printing a heading above the table
+    printf("Fahr\tCelsius\n");
+    printf("---------------\n");
 
-  fahr = lower;
-  while (fahr <= upper)
-  {
-    celsius = (5.0 / 9.0) * (fahr - 32.0);
-    printf("%3.0f\t\t%6.1f\n", fahr, celsius);
-    fahr = fahr + step;
-  }
+    fahr = lower;
+    while (fahr <= upper) {
+        celsius = (5.0 / 9.0) * (fahr - 32.0);
+        printf("%3.0f\t\t%6.1f\n", fahr, celsius);
+        fahr = fahr + step;
+    }
 
-  return 0;
+    return 0;
 }
 
 // NOTE: If all operands from an operation are integers then a integer operation

chapter_1/exercise_1_04/celsius_fahrenheit.c

@@ -4,25 +4,23 @@
 // for celsius = 0, 20, ... 300
 // floating point version
 
-int main(void)
-{
-  float celsius, fahr;
-  int lower, upper, step;
+int main(void) {
+    float celsius, fahr;
+    int lower, upper, step;
 
-  lower = 0;
-  upper = 300;
-  step = 20;
+    lower = 0;
+    upper = 300;
+    step = 20;
 
-  printf("Celsius\tFahr\n");
-  printf("---------------\n");
+    printf("Celsius\tFahr\n");
+    printf("---------------\n");
 
-  celsius = lower;
-  while (celsius <= upper)
-  {
-    fahr = (9.0 / 5.0) * celsius + 32.0f;
-    printf("%3.0f\t\t%6.1f\n", celsius, fahr);
-    celsius = celsius + step;
-  }
+    celsius = lower;
+    while (celsius <= upper) {
+        fahr = (9.0 / 5.0) * celsius + 32.0f;
+        printf("%3.0f\t\t%6.1f\n", celsius, fahr);
+        celsius = celsius + step;
+    }
 
-  return 0;
+    return 0;
 }

chapter_1/exercise_1_05/celsius_fahrenheit.c

@@ -4,28 +4,26 @@
 // for celsius = 0, 20, ... 300
 // floating point version with for loop
 
-int main(void)
-{
-  float celsius, fahr;
-  int lower, upper, step;
+int main(void) {
+    float celsius, fahr;
+    int lower, upper, step;
 
-  lower = 0;
-  upper = 300;
-  step = 20;
+    lower = 0;
+    upper = 300;
+    step = 20;
 
-  printf("Celsius\tFahr\n");
-  printf("---------------\n");
+    printf("Celsius\tFahr\n");
+    printf("---------------\n");
 
-  for (celsius = upper; celsius >= lower; celsius = celsius - step)
-  {
-    fahr = (9.0 / 5.0) * celsius + 32.0f;
-    printf("%3.0f\t\t%6.1f\n", celsius, fahr);
-  }
+    for (celsius = upper; celsius >= lower; celsius = celsius - step) {
+        fahr = (9.0 / 5.0) * celsius + 32.0f;
+        printf("%3.0f\t\t%6.1f\n", celsius, fahr);
+    }
 
-  return 0;
+    return 0;
 }
 
 // NOTE: Sometimes the for loop can be more explicit and more readable then the
-// while loop because it's more compact. The initialization and the incrementation
-// of the counter variable is done through the for loop params. However, the while
-// loop can be, sometimes, more customizable.
+// while loop because it's more compact. The initialization and the
+// incrementation of the counter variable is done through the for loop params.
+// However, the while loop can be, sometimes, more customizable.

chapter_1/exercise_1_06/verify_expression.c

@@ -1,9 +1,8 @@
 #include <stdio.h>
 
-int main(void)
-{
-  printf("value of expression: %d", getchar() != EOF);
-  return 0;
+int main(void) {
+    printf("value of expression: %d", getchar() != EOF);
+    return 0;
 }
 
 // NOTE: The expression getchar() != EOF is equal with 1 only if input char

chapter_1/exercise_1_07/print_eof.c

@@ -1,9 +1,8 @@
 #include <stdio.h>
 
-int main(void)
-{
-  printf("EOF: %d", EOF);
-  return 0;
+int main(void) {
+    printf("EOF: %d", EOF);
+    return 0;
 }
 
 // NOTE: The value of the EOF character is -1, which is an integer.

chapter_1/exercise_1_08/count_b_t_n.c

@@ -1,30 +1,23 @@
 #include <stdio.h>
 
-int main(void)
-{
-  int blanks_nr = 0;
-  int tabs_nr = 0;
-  int newlines_nr = 0;
+int main(void) {
+    int blanks_nr = 0;
+    int tabs_nr = 0;
+    int newlines_nr = 0;
 
-  char c;
-  while ((c = getchar()) != EOF)
-  {
-    if (c == ' ')
-    {
-      ++blanks_nr;
+    char c;
+    while ((c = getchar()) != EOF) {
+        if (c == ' ') {
+            ++blanks_nr;
+        } else if (c == '\t') {
+            ++tabs_nr;
+        } else if (c == '\n') {
+            ++newlines_nr;
+        }
     }
-    else if (c == '\t')
-    {
-      ++tabs_nr;
-    }
-    else if (c == '\n')
-    {
-      ++newlines_nr;
-    }
-  }
 
-  printf("blanks_nr: %d\ntabs_nr: %d\nnewlines_nr: %d\n",
-         blanks_nr, tabs_nr, newlines_nr);
+    printf("blanks_nr: %d\ntabs_nr: %d\nnewlines_nr: %d\n", blanks_nr, tabs_nr,
+           newlines_nr);
 
-  return 0;
+    return 0;
 }

chapter_1/exercise_1_09/copy_io.c

@@ -1,19 +1,16 @@
 #include <stdio.h>
 
-int main(void)
-{
-  int c;
-  int last_c = '\0';
+int main(void) {
+    int c;
+    int last_c = '\0';
 
-  while ((c = getchar()) != EOF)
-  {
-    if (c != ' ' || last_c != ' ')
-    {
-      putchar(c);
-    }
+    while ((c = getchar()) != EOF) {
+        if (c != ' ' || last_c != ' ') {
+            putchar(c);
+        }
 
-    last_c = c;
-  }
+        last_c = c;
+    }
 
-  return 0;
+    return 0;
 }

chapter_1/exercise_1_10/copy_io_esc_replace.c

@@ -1,30 +1,21 @@
 #include <stdio.h>
 
-int main(void)
-{
-  char c;
-  while ((c = getchar()) != EOF)
-  {
-    if (c == '\t')
-    {
-      putchar('\\');
-      putchar('t');
+int main(void) {
+    char c;
+    while ((c = getchar()) != EOF) {
+        if (c == '\t') {
+            putchar('\\');
+            putchar('t');
+        } else if (c == '\b') {
+            putchar('\\');
+            putchar('b');
+        } else if (c == '\\') {
+            putchar('\\');
+            putchar('\\');
+        } else {
+            putchar(c);
+        }
     }
-    else if (c == '\b')
-    {
-      putchar('\\');
-      putchar('b');
-    }
-    else if (c == '\\')
-    {
-      putchar('\\');
-      putchar('\\');
-    }
-    else
-    {
-      putchar(c);
-    }
-  }
 
-  return 0;
+    return 0;
 }