Ch04 updates

Author: pdeitel

examples/ch04/fig04_04.cpp

@@ -21,7 +21,7 @@ int main() {
    // calculate amount on deposit for each of ten years
    for (int year{1}; year <= 10; ++year) {
       // calculate amount on deposit at the end of the specified year
-      double amount = principal * pow(1.0 + rate, year);
+      double amount{principal * pow(1.0 + rate, year)} ;             
 
       // display the year and the amount
       cout << setw(4) << year << setw(20) << amount << endl;

examples/ch04/fig04_06.cpp

@@ -59,7 +59,7 @@ int main() {
    // if user entered at least one grade...
    if (gradeCounter != 0) {
       // calculate average of all grades entered
-      double average = static_cast<double>(total) / gradeCounter;  
+      double average{static_cast<double>(total) / gradeCounter};
 
       // output summary of results
       cout << "Total of the " << gradeCounter << " grades entered is " 

examples/ch04/fig04_11.cpp

@@ -10,7 +10,7 @@ int main() {
    string zipFileName;
    getline(cin, zipFileName); // inputs a line of text
 
-   // strings literals separated only by whitespace are combined 
+   // string literals separated only by whitespace are combined 
    // into a single string by the compiler
    string content{ 
       "This chapter introduces all but one of the remaining control "
@@ -29,9 +29,9 @@ int main() {
 
    miniz_cpp::zip_file output; // create zip_file object
 
-   // write content into a text file in outputZipFile
+   // write content into a text file in output
    output.writestr("intro.txt", content); // create file in ZIP
-   output.save(zipFileName); // save outputZipFile to zipFileName
+   output.save(zipFileName); // save output to zipFileName
 
    miniz_cpp::zip_file input{zipFileName}; // load zipFileName
 

examples/ch04/fig04_12/fig04_12.cpp

@@ -18,10 +18,7 @@ int main() {
 
    // calculate amount on deposit for each of ten years
    for (int year{1}; year <= 10; ++year) {
-      // calculate amount on deposit at the end of the specified year
-      double amount = principal * pow(1.0 + rate, year);
-
-      // display the year and the amount
+      double amount{principal * pow(1.0 + rate, year)};
       cout << format("{:>4d}{:>20.2f}\n", year, amount);
    }
 }