Arrays allow storing multiple values of the same type sequentially in memory. An array is declared with the type, name, and size. Elements are accessed using indexes from 0 to size-1. Strings are represented as character arrays terminated with a null character. Arrays can be passed to and returned from functions, and multidimensional arrays store arrays within arrays. Standard libraries provide functions for string and character manipulation.
Introduction to strings in C language
Declarations/initialization of character array and
String Library function like gets();strlen(),strcat(), strncat(),strcmp(),strncmp(),strrev(), strstr(), strnstr(), strcpy(),strncpy();
C Programming/Strings. A string in C is merely an array of characters. The length of a string is determined by a terminating null character: '-' . So, a string with the contents, say, "abc" has four characters: 'a' , 'b' , 'c' , and the terminating null character.
A string is a data type used in programming, such as an integer and floating point unit, but is used to represent text rather than numbers. It is comprised of a set of characters that can also contain spaces and numbers. For example, the word "hamburger" and the phrase "I ate 3 hamburgers" are both strings.
Introduction to strings in C language
Declarations/initialization of character array and
String Library function like gets();strlen(),strcat(), strncat(),strcmp(),strncmp(),strrev(), strstr(), strnstr(), strcpy(),strncpy();
C Programming/Strings. A string in C is merely an array of characters. The length of a string is determined by a terminating null character: '-' . So, a string with the contents, say, "abc" has four characters: 'a' , 'b' , 'c' , and the terminating null character.
A string is a data type used in programming, such as an integer and floating point unit, but is used to represent text rather than numbers. It is comprised of a set of characters that can also contain spaces and numbers. For example, the word "hamburger" and the phrase "I ate 3 hamburgers" are both strings.
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Succession “Losers”: What Happens to Executives Passed Over for the CEO Job?
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Overview:
Shareholders pay considerable attention to the choice of executive selected as the new CEO whenever a change in leadership takes place. However, without an inside look at the leading candidates to assume the CEO role, it is difficult for shareholders to tell whether the board has made the correct choice. In this Closer Look, we examine CEO succession events among the largest 100 companies over a ten-year period to determine what happens to the executives who were not selected (i.e., the “succession losers”) and how they perform relative to those who were selected (the “succession winners”).
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COURSE TITLE: SOFTWARE DEVELOPMENT VI
COURSE CODE: VIT 351
TOPICS COVERED:
ARRAYS
TYPES OF ARRAYS
MULTIDIMENSIONAL ARRAYS
CHARACTER HANDLING IN C
STRING HANDLING IN C
QUIZ SET 2
Visual programming (VP) refers to a method of programming that uses a graphical interface to create and modify code, rather than typing out code manually. Unlike traditional text-based programming, visual programming uses visual elements to represent code. Some graphical elements you can use when creating programs with VP include:
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The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
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1. 6.096 Introduction to C++ January 10, 2011
Massachusetts Institute of Technology John Marrero
Lecture 4 Notes: Arrays and Strings
1 Arrays
So far we have used variables to store values in memory for later reuse. We now explore a
means to store multiple values together as one unit, the array.
An array is a fixed number of elements of the same type stored sequentially in memory.
Therefore, an integer array holds some number of integers, a character array holds some
number of characters, and so on. The size of the array is referred to as its dimension. To
declare an array in C++, we write the following:
type arrayName[dimension];
To declare an integer array named arr of four elements, we write int arr[4];
The elements of an array can be accessed by using an index into the array. Arrays in C++ are
zero-indexed, so the first element has an index of 0. So, to access the third element in arr, we
write arr[2]; The value returned can then be used just like any other integer.
Like normal variables, the elements of an array must be initialized before they can be used;
otherwise we will almost certainly get unexpected results in our program. There are several
ways to initialize the array. One way is to declare the array and then initialize some or all of
the elements:
int arr[4];
arr[0] = 6;
arr[1] = 0;
arr[2] = 9;
arr[3] = 6;
Another way is to initialize some or all of the values at the time of declaration:
int arr[4] = { 6, 0, 9, 6 };
Sometimes it is more convenient to leave out the size of the array and let the compiler
determine the array's size for us, based on how many elements we give it:
int arr[] = { 6, 0, 9, 6, 2, 0, 1, 1 };
Here, the compiler will create an integer array of dimension 8.
The array can also be initialized with values that are not known beforehand:
1 #include <iostream>
2 using namespace std;
3
4 int main() {
5
6 int arr[4];
7 cout << “Please enter 4 integers:“ << endl;
8
9 for(int i = 0; i < 4; i++)
10 cin >> arr[i];
11
2. 12
13
cout << “Values in array are now:“;
14
15
16
for(int i = 0; i < 4; i++)
cout << “ “ << arr[i];
17
18
cout << endl;
19
20 }
return 0;
Note that when accessing an array the index given must be a positive integer from 0 to n-1,
where n is the dimension of the array. The index itself may be directly provided, derived from a
variable, or computed from an expression:
arr[5];
arr[i];
arr[i+3];
Arrays can also be passed as arguments to functions. When declaring the function, simply
specify the array as a parameter, without a dimension. The array can then be used as normal
within the function. For example:
0 #include <iostream>
1 using namespace std;
2
3 int sum(const int array[], const int length) {
4 long sum = 0;
5 for(int i = 0; i < length; sum += array[i++]);
6 return sum;
7 }
8
9 int main() {
10 int arr[] = {1, 2, 3, 4, 5, 6, 7};
11 cout << "Sum: " << sum(arr, 7) << endl;
12 return 0;
13 }
The function sum takes a constant integer array and a constant integer length as its arguments
and adds up length elements in the array. It then returns the sum, and the program prints out
Sum: 28.
It is important to note that arrays are passed by reference and so any changes made to the
array within the function will be observed in the calling scope.
C++ also supports the creation of multidimensional arrays, through the addition of more than
one set of brackets. Thus, a two-dimensional array may be created by the following:
type arrayName[dimension1][dimension2];
The array will have dimension1 x dimension2 elements of the same type and can be thought of
as an array of arrays. The first index indicates which of dimension1 subarrays to access, and
then the second index accesses one of dimension2 elements within that subarray. Initialization
and access thus work similarly to the one-dimensional case:
1 #include <iostream>
2 using namespace std;
3
4 int main() {
5 int twoDimArray[2][4];
6 twoDimArray[0][0] = 6;
7 twoDimArray[0][1] = 0;
8 twoDimArray[0][2] = 9;
3. 9 twoDimArray[0][3] = 6;
10 twoDimArray[1][0] = 2;
11 twoDimArray[1][1] = 0;
12 twoDimArray[1][2] = 1;
13 twoDimArray[1][3] = 1;
14
15 for(int i = 0; i < 2; i++)
16 for(int j = 0; j < 4; j++)
17 cout << twoDimArray[i][j];
18
19 cout << endl;
20 return 0;
21 }
The array can also be initialized at declaration in the following ways:
int twoDimArray[2][4] = { 6, 0, 9, 6, 2, 0, 1, 1 };
int twoDimArray[2][4] = { { 6, 0, 9, 6 } , { 2, 0, 1, 1 } };
Note that dimensions must always be provided when initializing multidimensional arrays, as it
is otherwise impossible for the compiler to determine what the intended element partitioning
is. For the same reason, when multidimensional arrays are specified as arguments to
functions, all dimensions but the first must be provided (the first dimension is optional), as in
the following:
int aFunction(int arr[][4]) { … }
Multidimensional arrays are merely an abstraction for programmers, as all of the elements in
the array are sequential in memory. Declaring int arr[2][4]; is the same thing as declaring
int arr[8];.
2 Strings
String literals such as “Hello, world!” are actually represented by C++ as a sequence of
characters in memory. In other words, a string is simply a character array and can be
manipulated as such.
Consider the following program:
1 #include <iostream>
2 using namespace std;
3
4 int main() {
5 char helloworld[] = { 'H', 'e', 'l', 'l', 'o', ',', ' ',
6 'w', 'o', 'r', 'l', 'd', '!', '0' };
7
8 cout << helloworld << endl;
9
10 return 0;
11 }
This program prints Hello, world! Note that the character array helloworld ends with a
special character known as the null character. This character is used to indicate the end of the
string.
Character arrays can also be initialized using string literals. In this case, no null character is
needed, as the compiler will automatically insert one:
char helloworld[] = “Hello, world!”;
4. The individual characters in a string can be manipulated either directly by the programmer or
by using special functions provided by the C/C++ libraries. These can be included in a program
through the use of the #include directive. Of particular note are the following:
• cctype (ctype.h): character handling
• cstdio (stdio.h): input/output operations
• cstdlib (stdlib.h): general utilities
• cstring (string.h): string manipulation
Here is an example to illustrate the cctype library:
1 #include <iostream>
2 #include <cctype>
3 using namespace std;
4
5 int main() {
6 char messyString[] = "t6H0I9s6.iS.999a9.STRING";
7
8 char current = messyString[0];
9 for(int i = 0; current != '0'; current = messyString[++i]) {
10 if(isalpha(current))
11 cout << (char)(isupper(current) ? tolower(current) : current);
12 else if(ispunct(current))
13 cout << ' ';
14 }
15
16 cout << endl;
17 return 0;
18 }
This example uses the isalpha, isupper, ispunct, and tolower functions from the cctype
library. The is- functions check whether a given character is an alphabetic character, an
uppercase letter, or a punctuation character, respectively. These functions return a Boolean
value of either true or false. The tolower function converts a given character to lowercase.
The for loop beginning at line 9 takes each successive character from messyString until it
reaches the null character. On each iteration, if the current character is alphabetic and
uppercase, it is converted to lowercase and then displayed. If it is already lowercase it is
simply displayed. If the character is a punctuation mark, a space is displayed. All other
characters are ignored. The resulting output is this is a string. For now, ignore the (char)
on line 11; we will cover that in a later lecture.
Here is an example to illustrate the cstring library:
1 #include <iostream>
2 #include <cstring>
3 using namespace std;
4
5 int main() {
6 char fragment1[] = "I'm a s";
7 char fragment2[] = "tring!";
8 char fragment3[20];
9 char finalString[20] = "";
10
11 strcpy(fragment3, fragment1);
12 strcat(finalString, fragment3);
13 strcat(finalString, fragment2);
14
15 cout << finalString;
16 return 0;
17 }
5. This example creates and initializes two strings, fragment1 and fragment2. fragment3 is
declared but not initialized. finalString is partially initialized (with just the null character).
fragment1 is copied into fragment3 using strcpy, in effect initializing fragment3 to I'm a s.
strcat is then used to concatenate fragment3 onto finalString (the function overwrites the
existing null character), thereby giving finalString the same contents as fragment3. Then
strcat is used again to concatenate fragment2 onto finalString. finalString is displayed,
giving I'm a string!.
You are encouraged to read the documentation on these and any other libraries of interest to
learn what they can do and how to use a particular function properly. (One source is
http://www.cplusplus.com/reference/.)