Can we use long in array index?

No, it’s not possible. JLS 15.10 states that the expression in an array initializer must be promoted to an int : Each dimension expression undergoes unary numeric promotion (§5.6. 1).

What type is an array index in C?

Accessing Array Elements: Array elements are accessed by using an integer index. Array index starts with 0 and goes till size of array minus 1. Name of the array is also a pointer to the first element of array.

What types are valid for array indexes?

The indexes are the values of an ordinal type, called the index type of the array. The elements all have the same size and the same type, called the element type of the array. There are two kinds of array types, fixed and open.

Can you index an array in C?

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.

Can array long long int?

Of course, that depends on hardware and compiler options, but in a regular PC (64-bits) under linux, you can use a long long int as an array index with no problem.

How do you initialize a long array?

If you want to initialize an array, try using Array Initializer: int[] data = {10,20,30,40,50,60,71,80,90,91}; // or int[] data; data = new int[] {10,20,30,40,50,60,71,80,90,91}; Notice the difference between the two declarations. When assigning a new array to a declared variable, new must be used.

Can you index a string in C?

The index() function locates the first occurrence of c (converted to an unsigned char) in the string pointed to by string. The character c can be the NULL character (\0); the ending NULL is included in the search. The string argument to the function must contain a NULL character (\0) marking the end of the string.

Can an array index be a double?

4 Answers. In case it isn’t clear, your array cannot be of double length. It’s undefined behavior. This is because a double is not an integer, but a rational number that could be an integer.

When should we use long long int?

long long int data type in C++ is used to store 64-bit integers. It is one of the largest data types to store integer values, unlike unsigned long long int both positive as well as negative.

Can I use a long int as an array index?

Of course, that depends on hardware and compiler options, but in a regular PC (64-bits) under linux, you can use a long long int as an array index with no problem. To be sure, use size_t for the index. The type can be of any datatype (primary or user_defined).

What is the index value of an array in C?

Index value starts at 0 and ends at n-1, where n is the size of an array. For example, if an array in C stores 5 elements, the index starts at 0 and ends with 4. To access or alter 1st value, use array_name [0] and to access or alter 5th value, then use array_name [4]. Let’s see the example of an Array in C for better understanding:

What is the best way to index an array in Java?

If you look at the Java Documentation in 10.4: Arrays must be indexed by int values; short, byte, or char values may also be used as index values because they are subjected to unary numeric promotion (§5.6.1) and become int values. An attempt to access an array component with a long index value results in a compile-time error.

What is an array type in C programming?

Array in C is a collection of similar types of elements (Type may be an integer, float, and long, etc.). So, in C programming, we can’t store multiple data type values in an array. For example, an integer array in C will store all the integer elements.