#include
using namespace std;
int main(){
int myTest;
int countTwentyEight;
int hundred;
hundred = 0;
countTwentyEight = 0;
myTest = 0;
while ( hundred < 10 ){
cout << endl << "Please insert a number" << endl;
cin >> myTest;
if ( myTest == 28 ){
countTwentyEight++;
cout << endl << countTwentyEight << endl;8
}
hundred++;
}
return 0;
}
notes
nested loops
It works! Yippeee :)
//////////////////////////////////////////////////
// This program is designed to take the input of//
// the day in Julian Date format and return the //
// day of the week. It should be noted that this//
// is my second version which uses switch statements //
// while my first version used if statements //
// statement. //
//////////////////////////////////////////////////
#include
using namespace std;
int main(){
long julDate;
int dayOfTheWeek;
cout << "\nInsert the Julian Date.\n";
cin >> julDate;
dayOfTheWeek = (julDate + 1) % 7;
switch (dayOfTheWeek) {
case 0 : cout << "\nJulian Date " << julDate << " is on a Sunday\n";
break;
case 1 : cout << "\nJulian Date " << julDate << " is on a Monday\n";
break;
case 2 : cout << "\nJulian Date " << julDate << " is on a Tuesday\n";
break;
case 3 : cout << "\nJulian Date " << julDate << " is on a Wednesday\n";
break;
case 4 : cout << "\nJulian Date " << julDate << " is on a Thursday\n";
break;
case 5 : cout << "\nJulian Date " << julDate << " is on a Friday\n";
break;
case 6 : cout << "\nJulian Date " << julDate << " is on a Saturday\n";
break;
default: cout << "\nI'm not sure what the day of the week is. I might be broken \n";
return 0;
}
}
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//////////////////////////////////////////////////
// This program is designed to take the input of//
// the day in Julian Date format and return the //
// day of the week. It should be noted that this//
// is my first version which uses if statements //
// while my second version will use the switch //
// statement. //
//////////////////////////////////////////////////
#include
using namespace std;
int main() {
long julDate;
int dayOfTheWeek;
cout << "\nInsert the Julian Date.\n";
cin >> julDate;
dayOfTheWeek = (julDate + 1) % 7;
if (dayOfTheWeek == 0)
cout << "Julian Date " << julDate << " is on a Sunday";
if (dayOfTheWeek == 1)
cout << "Julian Date " << julDate << " is on a Monday";
if (dayOfTheWeek == 2)
cout << "Julian Date " << julDate << " is on a Tuesday";
if (dayOfTheWeek == 3)
cout << "Julian Date " << julDate << " is on a Wednesday";
if (dayOfTheWeek == 4)
cout << "Julian Date " << julDate << " is on a Thursday";
if (dayOfTheWeek == 5)
cout << "Julian Date " << julDate << " is on a Friday";
if (dayOfTheWeek == 6)
cout << "Julian Date " << julDate << " is on a Saturday";
return 0;
}
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Chapter 5 (pg 202)
C++ Control Structures
if
if else
switch
------
Logical expressions are also called boolean expressions. This is because they can only be true or false.
new statement: bool
it is a built-in value consisting only of two types. True and False. eg 0 or 1
------
Relational operators:
== equal to
!= not equal to
> greater than
< less than
>= greater than or equal to
<= greater than or less than
Logical operators:
&& and
|| or
! not
----------
1) (taxRate > 0.25) && ( income < 20000 )
2) (temperature <= 75) || (humidity < 0.70)
3) (age > 21) && (age < 60)
4)
C++ Control Structures
if
if else
switch
------
Logical expressions are also called boolean expressions. This is because they can only be true or false.
new statement: bool
it is a built-in value consisting only of two types. True and False. eg 0 or 1
------
Relational operators:
== equal to
!= not equal to
> greater than
< less than
>= greater than or equal to
<= greater than or less than
Logical operators:
&& and
|| or
! not
----------
1) (taxRate > 0.25) && ( income < 20000 )
2) (temperature <= 75) || (humidity < 0.70)
3) (age > 21) && (age < 60)
4)
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#include // woop woop!
ofstream ("output file stream")
ifstream ("input file stream")
To use disk i/o you must:
--> use #include
--> choose valid _identifiers_ for your filestreams and declare them
--> open the files and associate them with disk names
--> use your filestream identifiers in your i/o statements (using >> and <<, manipulators, get,
ignore)
--> close the damned files!
//############################
//EXAMPLE
//############################
#include
using namespace std;
int main()
ifstream myInfile;
ofstream myOutfile;
myInfile.open("A:\\myIn.dat");
myOutfile.open("A:\\myOut.dat");
myInfile.close();
myOutfile.close();
return 0;
}
#############################
- Pay attention above. If you want a slash in the filename you have to put two. eg:
("A:\\myOut.dat")
- Closing a file does not require arguments. eg myInfile.close() <-- empty parentheses
//############################
//Time
///////////////////////////
#include
ifstream inFile;
string fileName;
cout << "Enter input file name: " << endl; // prompt
cin >> fileName;
//convert string fileName to a C string type
inFile.open( fileName.c_str()); // the c_str() is a seperate function that performs a
// manipulation on the filename in order to make it work.
// JUST ACCEPT IT AND MOVE ON.
//########################################
- if the output file does not exist on disk, a new file with that name is created.
----------------------------------------------------------------------------------
ENTER Object-oriented design principles
ENTER Functional Decomposition methodology
Read the slides for PT 2 of chapter four for definitions of these.
FD (functional decomposition) starts with a:
-Concrete Step - A step for which implementation
details are fully specified.
-Abstract step - A step for which some implementation details remain unspecified
-Module - A self-contained
ofstream ("output file stream")
ifstream ("input file stream")
To use disk i/o you must:
--> use #include
--> choose valid _identifiers_ for your filestreams and declare them
--> open the files and associate them with disk names
--> use your filestream identifiers in your i/o statements (using >> and <<, manipulators, get,
ignore)
--> close the damned files!
//############################
//EXAMPLE
//############################
#include
using namespace std;
int main()
ifstream myInfile;
ofstream myOutfile;
myInfile.open("A:\\myIn.dat");
myOutfile.open("A:\\myOut.dat");
myInfile.close();
myOutfile.close();
return 0;
}
#############################
- Pay attention above. If you want a slash in the filename you have to put two. eg:
("A:\\myOut.dat")
- Closing a file does not require arguments. eg myInfile.close() <-- empty parentheses
//############################
//Time
///////////////////////////
#include
ifstream inFile;
string fileName;
cout << "Enter input file name: " << endl; // prompt
cin >> fileName;
//convert string fileName to a C string type
inFile.open( fileName.c_str()); // the c_str() is a seperate function that performs a
// manipulation on the filename in order to make it work.
// JUST ACCEPT IT AND MOVE ON.
//########################################
- if the output file does not exist on disk, a new file with that name is created.
----------------------------------------------------------------------------------
ENTER Object-oriented design principles
ENTER Functional Decomposition methodology
Read the slides for PT 2 of chapter four for definitions of these.
FD (functional decomposition) starts with a:
-Concrete Step - A step for which implementation
details are fully specified.
-Abstract step - A step for which some implementation details remain unspecified
-Module - A self-contained
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