CPlusPlus20ForProgrammers-master/examples/ch06/fig06_12.cpp

@@ -15,63 +15,18 @@ int multiply_int(int x, int y) {
 }
 
 
-double f(double& x){
-	return x*x;
-}
-
-template <typename T, typename F, long unsigned int N>
-T integrate (std::array<T, N> x, F f){
-	T tmp{T(0)};
-	for (auto s: x){
-            tmp+= f(s);
-	}
-	return tmp;
-}
-
-
-typedef double (*FUNC)(double&);
-
-
-template <typename T, long unsigned int N>
-T integrate2 (std::array<T, N> x, FUNC f){
-        T tmp{T(0)};
-        for (auto s: x){
-            tmp+= f(s);
-         }
-         return tmp;
-}
-
-
 int main() {
    constexpr std::array integers{1, 2, 3, 4, 5};
-   std::array floats {1.0, 2.0, 3.0, 4.0, 5.0};
+   constexpr std::array floats {1.0, 2.0, 3.0, 4.0, 5.0};
    auto multiply_lambda = [](const auto& x, const auto& y) {return x * y; };
 
-   auto f_lambda = [](auto& x) {return x*x;};
-
-   auto g_lambda = [&integers](auto& x) {
-	   auto tmp{0};
-	   for (int i{0};auto s: x){
-               tmp += s*integers[i];
-	   }
-	   return tmp;
-   };
-
    std::cout << "Product of integers: " <<  std::accumulate( std::begin(integers), std::end(integers), 1, multiply<int>) << "\n";
 
-   std::cout << "Product of integers: " <<  std::accumulate( integers.cbegin(), integers.cend(), 1, multiply<int>) << "\n";
-
    std::cout << "Product of integers with a lambda: " << std::accumulate(std::begin(integers), std::end(integers), 1, multiply_lambda) << "\n";
 
    std::cout << "Product of integers with a lambda: " << std::accumulate(std::begin(floats), std::end(floats), 1, multiply_int) << "\n";
 
    std::cout << "Product of integers with a lambda: " << std::accumulate(std::begin(floats), std::end(floats), 1, multiply_lambda) << "\n";
-
-   std::cout << "Integration2  template  " << integrate2(floats, f) << "\n";
-
-   std::cout << "Integration  full  template  " << integrate(floats, f_lambda) << "\n";
-
-   std::cout << "Lambda test   " << g_lambda(floats) << "\n";
 }
 
 

CPlusPlus20ForProgrammers-master/examples/ch06/fig06_13.cpp

@@ -1,6 +1,7 @@
 // fig06_13.cpp
 // Functional-style programming with C++20 ranges and views.
 #include <array>
+#include <fmt/format.h>
 #include <iostream>
 #include <numeric>
 #include <ranges>
@@ -9,10 +10,10 @@ int main() {
    // lambda to display results of range operations
    auto showValues{
       [](auto& values, const std::string& message) {
-         std::cout <<  message << "\n";
+         std::cout << fmt::format("{}: ", message);
 
          for (const auto& value : values) {
-            std::cout << value << " ";
+            std::cout << fmt::format("{} ", value);
          }
 
          std::cout << '\n';
@@ -39,8 +40,8 @@ int main() {
    showValues(values4, "Squares of even integers");
 
    // total the squares of the even integers 
-   std::cout << "Sum squares of even integers 2-10: \n",
+   std::cout << fmt::format("Sum squares of even integers 2-10: {}\n",
-      std::accumulate(std::begin(values4), std::end(values4), 0);
+      std::accumulate(std::begin(values4), std::end(values4), 0));
 
    // process a container's elements
    constexpr std::array numbers{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

CPlusPlus20ForProgrammers-master/examples/ch06/vector.cpp

@@ -1,33 +0,0 @@
-// resizing vector
-#include <iostream>
-#include <vector>
-#include <array>
-
-int main ()
-{
-  std::vector<int> myvector;
-  // set some initial content:
-  for (int i=1;i<10;i++) myvector.push_back(i);
-
-  myvector.resize(5);
-  std::cout << "myvector contains:";
-  for (int i=0;i<myvector.size();i++)
-    std::cout << ' ' << myvector[i];
-  std::cout << '\n';
-
-  myvector.resize(8,100);
-
-  std::cout << "myvector contains:";
-  for (int i=0;i<myvector.size();i++)
-    std::cout << ' ' << myvector[i];
-  std::cout << '\n';
-
-  myvector.resize(12);
-
-  std::cout << "myvector contains:";
-  for (int i=0;i<myvector.size();i++)
-    std::cout << ' ' << myvector[i];
-  std::cout << '\n';
-
-  return 0;
-}

CPlusPlus20ForProgrammers-master/examples/ch07/fig07_01.cpp

@@ -1,7 +1,6 @@
 // fig07_01.cpp
 // Pointer operators & and *.
 #include <iostream>
-#include <array>
 using namespace std;
 
 int main() {

CPlusPlus20ForProgrammers-master/examples/ch07/fig07_02.cpp

@@ -1,5 +1,6 @@
 // fig07_02.cpp
 // Pass-by-value used to cube a variable's value.
+#include <fmt/format.h>
 #include <iostream>
 
 int cubeByValue(int n); // prototype 
@@ -7,9 +8,9 @@ int cubeByValue(int n); // prototype
 int main() {
    int number{5};
 
-   std::cout << "Original value of number is " << number << "\n";
+   std::cout << fmt::format("Original value of number is {}\n", number);
    number = cubeByValue(number); // pass number by value to cubeByValue
-   std::cout << "New value of number is " << number <<"\n";
+   std::cout << fmt::format("New value of number is {}\n", number);
 }
 
 // calculate and return cube of integer argument                

CPlusPlus20ForProgrammers-master/examples/ch07/fig07_03.cpp

@@ -8,10 +8,10 @@ void cubeByReference(int* nPtr); // prototype
 
 int main() {
    int number{5};
-   std::cout << "Original value of number is " << number << "\n";
-   cubeByValue(number); // pass number by value to cubeByValue
-   std::cout << "New value of number is " << number <<"\n";
 
+   std::cout << fmt::format("Original value of number is {}\n", number);
+   cubeByReference(&number); // pass number address to cubeByReference
+   std::cout << fmt::format("New value of number is {}\n", number);
 }
 
 // calculate cube of *nPtr; modifies variable number in main 

CPlusPlus20ForProgrammers-master/examples/ch07/fig07_10.cpp

@@ -1,6 +1,7 @@
 // fig07_10.cpp
 // Sizeof operator when used on a built-in array's name
 // returns the number of bytes in the built-in array.
+#include <fmt/format.h>
 #include <iostream>
 
 size_t getSize(double* ptr); // prototype
@@ -8,13 +9,11 @@ size_t getSize(double* ptr); // prototype
 int main() {
    double numbers[20]; // 20 doubles; occupies 160 bytes on our system
 
+   std::cout << fmt::format("Number of bytes in numbers is {}\n\n",
+      sizeof(numbers));
 
-
+   std::cout << fmt::format("Number of bytes returned by getSize is {}\n",
-   std::cout << "Number of bytes in numbers is " << sizeof(numbers)<<"\n";
+      getSize(numbers));
-
-   std::cout << "Actual nukber of elements : " << sizeof(numbers)/sizeof(double) << "\n";
-
-   std::cout << "Number of bytes returned by getSize is " <<     getSize(numbers) << "\n";
 }
 
 // return size of ptr         

CPlusPlus20ForProgrammers-master/examples/ch07/fig07_13.cpp

@@ -1,12 +1,13 @@
 // fig07_13.cpp
 // Reading in command-line arguments.
+#include <fmt/format.h>
 #include <iostream>
 
 int main(int argc, char* argv[]) {
-   std::cout << "Number of arguments: " << argc << "\n";
+   std::cout << fmt::format("Number of arguments: {}\n\n", argc);
 
-   for (int i{1}; i < argc; ++i) {
+   for (int i{0}; i < argc; ++i) {
-      std::cout << argv[i] <<  "\n" ;
+      std::cout << fmt::format("{}\n", argv[i]);
    }
 }