Array String Dev C++

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C Arrays Arrays are used to store multiple values in a single variable, instead of declaring separate variables for each value. To declare an array, define the variable type, specify the name of the array followed by square brackets and specify the number of elements it should store. #include string std::string mystrings100; That is C, using the STL. In C, you would do it like this: char. mystrings100; This reads as 'my strings is an array of 100 pointer to char', and the latter is how strings are represented in C. Note - In C, the lower bound is always 0 and the upper bound is size-1. (size specifies the number of elements in the array). In C, all arrays consist of contiguous memory locations.The lowest address corresponds to the first element and the highest address to the last element.

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C Programming
Arrays and strings

Arrays in C act to store related data under a single variable name with an index, also known as a subscript. It is easiest to think of an array as simply a list or ordered grouping for variables of the same type. As such, arrays often help a programmer organize collections of data efficiently and intuitively.

Later we will consider the concept of a pointer, fundamental to C, which extends the nature of the array (array can be termed as a constant pointer). For now, we will consider just their declaration and their use.


C arrays are declared in the following form:

For example, if we want an array of six integers (or whole numbers), we write in C:

For a six character array called letters,

and so on.

You can also initialize as you declare. Just put the initial elements in curly brackets separated by commas as the initial value:


For example, if we want to initialize an array with six integers, with 0, 0, 1, 0, 0, 0 as the initial values:

Array String Dev C++

Though when the array is initialized as in this case, the array dimension may be omitted, and the array will be automatically sized to hold the initial data:

This is very useful in that the size of the array can be controlled by simply adding or removing initializer elements from the definition without the need to adjust the dimension.

If the dimension is specified, but not all elements in the array are initialized, the remaining elements will contain a value of 0. This is very useful, especially when we have very large arrays.

The above example sets the first value of the array to 245, and the rest to 0.

If we want to access a variable stored in an array, for example with the above declaration, the following code will store a 1 in the variable x

Arrays in C are indexed starting at 0, as opposed to starting at 1. The first element of the array above is point[0]. The index to the last value in the array is the array size minus one.In the example above the subscripts run from 0 through 5. C does not guarantee bounds checking on array accesses. The compiler may not complain about the following (though the best compilers do):

During program execution, an out of bounds array access does not always cause a run time error. Your program may happily continue after retrieving a value from point[-1]. To alleviate indexing problems, the sizeof() expression is commonly used when coding loops that process arrays.

Many people use a macro that in turn uses sizeof() to find the number of elements in an array,a macro variously named'lengthof()',[1]'MY_ARRAY_SIZE()' or 'NUM_ELEM()',[2]'SIZEOF_STATIC_ARRAY()',[3]etc.

Notice in the above example, the size of the array was not explicitly specified. The compiler knows to size it at 5 because of the five values in the initializer list. Adding an additional value to the list will cause it to be sized to six, and because of the sizeof expression in the for loop, the code automatically adjusts to this change. Good programming practice is to declare a variable size , and store the number of elements in the array in it.

size = sizeof(anArray)/sizeof(short)

C also supports multi dimensional arrays (or, rather, arrays of arrays). The simplest type is a two dimensional array. This creates a rectangular array - each row has the same number of columns. To get a char array with 3 rows and 5 columns we write in C

To access/modify a value in this array we need two subscripts:


Similarly, a multi-dimensional array can be initialized like this:

The amount of columns must be explicitly stated; however, the compiler will find the appropriate amount of rows based on the initializer list.

There are also weird notations possible:

a[i] and i[a] refer to the same location. (This is explained later in the next Chapter.)


String 'Merkkijono' stored in memory

C has no string handling facilities built in; consequently, strings are defined as arrays of characters. C allows a character array to be represented by a character string rather than a list of characters, with the null terminating character automatically added to the end. For example, to store the string 'Merkkijono', we would write


In the first example, the string will have a null character automatically appended to the end by the compiler; by convention, library functions expect strings to be terminated by a null character. The latter declaration indicates individual elements, and as such the null terminator needs to be added manually.

Strings do not always have to be linked to an explicit variable. As you have seen already, a string of characters can be created directly as an unnamed string that is used directly (as with the printf functions.)

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To create an extra long string, you will have to split the string into multiple sections, by closing the first section with a quote, and recommencing the string on the next line (also starting and ending in a quote):

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While strings may also span multiple lines by putting the backslash character at the end of the line, this method is deprecated.

There is a useful library of string handling routines which you can use by including another header file.

This standard string library will allow various tasks to be performed on strings, and is discussed in the Strings chapter.


  1. Pádraig Brady.'C and C++ notes'.
  2. C Programming/Pointers and arrays
  3. MINC/Reference/MINC1-volumeio-programmers-reference

C# Build String Array

C Programming
Arrays and strings
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