improved ch01 code formatting.

ch01/README.md

@@ -45,12 +45,12 @@ int main()
 
 int main()
 {
-  std::cout << "Enter two numbers:" << std::endl;
-  int v1 = 0, v2 = 0;
-  std::cin >> v1 >> v2;
-  std::cout << "The product of " << v1 << " and " << v2
-  << " is " << v1 * v2 << std::endl;
-  return 0;
+    std::cout << "Enter two numbers:" << std::endl;
+    int v1 = 0, v2 = 0;
+    std::cin >> v1 >> v2;
+    std::cout << "The product of " << v1 << " and " << v2
+              << " is " << v1 * v2 << std::endl;
+    return 0;
 }
 ```
 
@@ -63,17 +63,17 @@ int main()
 
 int main()
 {
-  std::cout << "Enter two numbers:" << std::endl;
-  int v1 = 0, v2 = 0;
-  std::cin >> v1 >> v2;
-  std::cout << "The product of ";
-  std::cout << v1;
-  std::cout << " and ";
-  std::cout << v2;
-  std::cout << " is ";
-  std::cout << v1 * v2;
-  std::cout << std::endl;
-  return 0;
+    std::cout << "Enter two numbers:" << std::endl;
+    int v1 = 0, v2 = 0;
+    std::cin >> v1 >> v2;
+    std::cout << "The product of ";
+    std::cout << v1;
+    std::cout << " and ";
+    std::cout << v2;
+    std::cout << " is ";
+    std::cout << v1 * v2;
+    std::cout << std::endl;
+    return 0;
 }
 ```
 
@@ -138,8 +138,9 @@ std::cout << /* "*/" /* "/*" */;
 ```
 
 Output:
-
+```sh
     /**/ */ /*
+```
 
 ##[Exercise 1.9](ex1_9.cpp)
 ##[Exercise 1.10](ex1_10.cpp)
@@ -151,7 +152,7 @@ of sum?
 ```cpp
 int sum = 0;
 for (int i = -100; i <= 100; ++i)
-sum += i;
+    sum += i;
 ```
 
 the loop sums the numbers from -100 to 100. the final value of sum is zero.
@@ -165,13 +166,13 @@ Ex1.9:
 
 int main()
 {
-  int sum = 0;
-  for (int i=50; i<=100; ++i)
-      sum += i;
+    int sum = 0;
+    for (int i=50; i<=100; ++i)
+        sum += i;
 
-  std::cout << "the sum is: " << sum << std::endl;
+    std::cout << "the sum is: " << sum << std::endl;
 
-  return 0;
+    return 0;
 }
 ```
 
@@ -181,10 +182,10 @@ Ex1.10:
 
 int main()
 {
-  for (int i=10; i>=0; --i)
-    std::cout << i << std::endl;
+    for (int i=10; i>=0; --i)
+        std::cout << i << std::endl;
 
-  return 0;
+    return 0;
 }
 ```
 
@@ -194,21 +195,20 @@ Ex1.11:
 
 int main()
 {
-  int val_small = 0, val_big = 0;
-  std::cout << "please input two integers:";
-  std::cin >> val_small >> val_big;
+    int val_small = 0, val_big = 0;
+    std::cout << "please input two integers:";
+    std::cin >> val_small >> val_big;
 
-  if (val_small > val_big)
-  {
-    int tmp = val_small;
-    val_small = val_big;
-    val_big = tmp;
-  }
+    if (val_small > val_big) {
+        int tmp = val_small;
+        val_small = val_big;
+        val_big = tmp;
+    }
 
-  for (int i=val_small; i<=val_big; ++i)
-    std::cout << i << std::endl;
+    for (int i = val_small; i <= val_big; ++i)
+        std::cout << i << std::endl;
 
-  return 0;
+    return 0;
 }
 ```
 
@@ -245,17 +245,17 @@ The following are my own version:
 
 int main()
 {
-  int limit = 0, sum = 0, value = 0;
-  std::cout << "How many integers would you like to enter?";
-  std::cin >> limit;
+    int limit = 0, sum = 0, value = 0;
+    std::cout << "How many integers would you like to enter?";
+    std::cin >> limit;
 
-  // assume we don't know what is EOF(End-Of-File).
-  while (std::cin >> value && (--limit != 0))
-    sum += value;
+    // assume we don't know what is EOF(End-Of-File).
+    while (std::cin >> value && (--limit != 0))
+        sum += value;
 
-  std::cout << sum + value << std::endl;
+    std::cout << sum + value << std::endl;
 
-  return 0;
+    return 0;
 }
 ```
 

ch01/ex1_1.cpp

@@ -1,4 +1,4 @@
 int main()
 {
-  return 0;
+    return 0;
 }

ch01/ex1_10.cpp

@@ -4,12 +4,11 @@
 
 int main()
 {
-	int val = 10;
-	while (val >= 0)
-	{
-		std::cout << val << std::endl;
-		--val;
-	}
-
-	return 0;
+    int val = 10;
+    while (val >= 0) {
+        std::cout << val << std::endl;
+        --val;
+    }
+
+    return 0;
 }

ch01/ex1_11.cpp

@@ -4,22 +4,20 @@
 
 int main()
 {
-	int val_small = 0, val_big = 0;
-	std::cout << "please input two integers:";
-	std::cin >> val_small >> val_big;
-
-	if (val_small > val_big)
-	{
-		int tmp = val_small;
-		val_small = val_big;
-		val_big = tmp;
-	}
-
-	while (val_small <= val_big)
-	{
-		std::cout << val_small << std::endl;
-		++val_small;
-	}
-
-	return 0;
+    int val_small = 0, val_big = 0;
+    std::cout << "please input two integers:";
+    std::cin >> val_small >> val_big;
+
+    if (val_small > val_big) {
+        int tmp = val_small;
+        val_small = val_big;
+        val_big = tmp;
+    }
+
+    while (val_small <= val_big) {
+        std::cout << val_small << std::endl;
+        ++val_small;
+    }
+
+    return 0;
 }

ch01/ex1_16.cpp

@@ -2,15 +2,15 @@
 
 int main()
 {
-  int limit = 0, sum = 0, value = 0;
-  std::cout << "How many integers would you like to enter?";
-  std::cin >> limit;
+    int limit = 0, sum = 0, value = 0;
+    std::cout << "How many integers would you like to enter?";
+    std::cin >> limit;
 
-  // assume we don't know what is EOF(End-Of-File).
-  while (std::cin >> value && (--limit != 0))
-    sum += value;
+    // assume we don't know what is EOF(End-Of-File).
+    while (std::cin >> value && (--limit != 0))
+        sum += value;
 
-  std::cout << sum + value << std::endl;
+    std::cout << sum + value << std::endl;
 
-  return 0;
+    return 0;
 }

ch01/ex1_20.cpp

@@ -1,11 +1,11 @@
 #include <iostream>
-#include "include/Sales_item.h"
+#include "../include/Sales_item.h"
 
 int main()
 {
-  Sales_item item;
-  while (std::cin >> item)
-    std::cout << item << std::endl;
+    Sales_item item;
+    while (std::cin >> item)
+        std::cout << item << std::endl;
 
-  return 0;
+    return 0;
 }

ch01/ex1_21.cpp

@@ -1,18 +1,16 @@
 #include <iostream>
-#include "include/Sales_item.h"
+#include "../include/Sales_item.h"
 
 int main()
 {
-  Sales_item item1, item2;
-  std::cin >> item1 >> item2;
-  if (item1.isbn() == item2.isbn())
-  {
-  	std::cout << item1 + item2 << std::endl;
-  	return 0;
-  }
-  else
-  {
-  	std::cerr << "Data must refer to same ISBN." << std::endl;
-  	return -1;
-  }
+    Sales_item item1, item2;
+    std::cin >> item1 >> item2;
+    if (item1.isbn() == item2.isbn()) {
+        std::cout << item1 + item2 << std::endl;
+        return 0;
+    }
+    else {
+        std::cerr << "Data must refer to same ISBN." << std::endl;
+        return -1;
+    }
 }

ch01/ex1_22.cpp

@@ -1,5 +1,5 @@
 #include <iostream>
-#include "include/Sales_item.h"
+#include "../include/Sales_item.h"
 
 int main()
 {

ch01/ex1_23.cpp

@@ -1,28 +1,24 @@
 #include <iostream>
-#include "include/Sales_item.h"
+#include "../include/Sales_item.h"
 
 int main()
 {
-  Sales_item currItem, valItem;
-  if (std::cin >> currItem)
-  {
-    int cnt = 1;
-    while (std::cin >> valItem)
-    {
-      if (valItem.isbn() == currItem.isbn())
-        ++cnt;
-      else 
-      {
+    Sales_item currItem, valItem;
+    if (std::cin >> currItem) {
+        int cnt = 1;
+        while (std::cin >> valItem) {
+            if (valItem.isbn() == currItem.isbn())
+                ++cnt;
+            else {
+                std::cout << currItem << " occurs "
+                << cnt << " times " << std::endl;
+                currItem = valItem;
+                cnt = 1;
+            }
+        }
+
         std::cout << currItem << " occurs "
-                  << cnt << " times " << std::endl;
-        currItem = valItem;
-        cnt = 1;
-      }
+        << cnt << " times " << std::endl;
     }
-
-    std::cout << currItem << " occurs "
-              << cnt << " times " << std::endl;
-  }
-  return 0;
+    return 0;
 }
-

ch01/ex1_9.cpp

@@ -4,16 +4,15 @@
 
 int main()
 {
-	int sum = 0, val = 50;
-	while (val <= 100)
-	{
-		sum += val;
-		++val;
-	}
-
-	std::cout << "the sum is: " << sum << std::endl;
-
-	return 0;
+    int sum = 0, val = 50;
+    while (val <= 100) {
+        sum += val;
+        ++val;
+    }
+
+    std::cout << "the sum is: " << sum << std::endl;
+
+    return 0;
 }
 
 // output: the sum is: 3825