The function of brackets in c++

The role of square brackets in C

The square brackets in C have two main uses:

1. Array index

Square brackets are used to access elements in an array. An array is a fixed-size collection of data of the same type, with each element having a unique integer identifier called an index. The index within square brackets specifies the array element to be accessed.

For example:

<code class="cpp">int myArray[5];
myArray[0] = 10;</code>

This line of code defines an array myArray containing 5 integer elements. It assigns the value 10 to the first element of the array (index 0).

2. Pointer dereference

Square brackets can also be used to dereference pointers. A pointer is a variable that stores the address of another variable. The expression within square brackets is used to obtain the value of the variable pointed to by the pointer.

For example:

<code class="cpp">int* myPointer = &myVariable;
int dereferencedValue = *myPointer;</code>

This line of code defines a pointer myPointer, which points to the variable myVariable. The expression inside square brackets *myPointer dereferences the pointer and returns the value of myVariable, storing it in the variable dereferencedValue.

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