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18 November, 07:21

Assume that an array of integers named a that contains exactly five elements has been declared and initialized. Write a single statement that assigns a new value to the first element of the array. This new value should be equal to twice the value stored in the last element of the array.

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  1. 18 November, 08:44
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    In any programming language, the assignment statement is written as shown.

    a[0] = 2*a[4];

    Explanation:

    This scenario is explained in c+ + language.

    An array is declared as follows.

    Datatype array_name[length];

    The variable length denotes the number of elements in the array. It is also an integer variable.

    An element in the array is written as arr[k], where value of k ranges from 0 to (length-1).

    The first element is written as array_name[0], second element is written as array_name[1], and so on.

    The elements in the array are initialized as shown.

    array_name[0] = value1;

    array_name[1] = value2;

    For the given scenario, an integer array a is declared.

    The variable length will be initialized to 5, which means the array a has exactly 5 elements.

    int length = 5;

    int a[length];

    The elements of array a are initialized as shown.

    a[0] = 1;

    a[1] = 2;

    a[2] = 3;

    a[3] = 4;

    a[4] = 5;

    As per the given scenario, the first element of the array, a[0], needs to be assigned a new value. This new value is twice the value of the last element of the array, a[4].

    The assignment statement is written as shown.

    a[0] = (2 * a[4]);

    The above statement assigns twice the value of the last element to the first element.

    Thus, after the above statement is executed, the old value of a[0] which is 1 is over written.

    Now, a[0] will hold new value which is

    (2 * a[4])

    = (2 * 5)

    = 10.

    The value of the first element, a[0], is changed from 1 to 10.

    The above can be programmed as shown.

    #include

    using namespace std;

    int main () {

    int length = 5;

    int a[length];

    a[0] = 1;

    a[1] = 2;

    a[2] = 3;

    a[3] = 4;

    a[4] = 5;

    a[0] = (2*a[4]);

    return 0;

    }
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