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Kasim Kamal Questions
290 Questions
In such cases, it is better to create an empty vector and use a vector member named push_back to add elements at run time. The push_back operation takes a value and “pushes” that value as a new last element onto the “back” of the vector. For example
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2022-07-04
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To list initialize a vector of strings, we must supply values that can be used as strings. In this case, there is no confusion about whether to list initialize the elements or construct a vector of the given size
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if we supply exactly two int values, those values could be a size and an initial value, or they could be values for a two-element vector. We specify which meaning we intend by whether we use curly braces or parentheses
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The second restriction is that when we supply an element count without also supplying an initial value, we must use the direct form of initialization
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If the vector holds elements of a built-in type, such as int, then the element initializer has a value of 0. If the elements are of a class type, such as string, then the element initializer is itself default initialized
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We can also initialize a vector from a count and an element value. The count determines how many elements the vector will have; the value provides the initial value for each of those elements
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A third restriction is that we can supply a list of element values only by using list initialization in which the initializers are enclosed in curly braces. We cannot supply a list of initializers using parentheses
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We can also supply initial value(s) for the element(s) when we define a vector. For example, we can copy elements from another vector. When we copy a vector, each element in the new vector is a copy of the corresponding element in the original vector. The two vectors must be the same type
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We can default initialize a vector (§ 2.2.1, p. 44), which creates an empty vector of the specified type
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In the case of vector, the additional information we supply is the type of the objects the vector will hold
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To use a vector, we must include the appropriate header. In our examples, we also assume that an appropriate using declaration is made
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As an example, let’s assume we have a number between 0 and 15 and we want to generate the hexadecimal representation of that number. We can do so using a string that is initialized to hold the 16 hexadecimal “digits”
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As a another example, we’ll change the first word in s to all uppercase
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