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Chapter 7: Problem 23

If an array is partially initialized, the uninitialized elements will be set to _________.

Short Answer

Expert verified
Answer: In a partially initialized array, uninitialized elements are automatically set to a default value. For integer arrays, this default value is 0. The same applies to other primitive data types like float and double, where the uninitialized element will be set to 0.0.

Step by step solution

01

Introduction to Arrays and Partial Initialization

Arrays are used to store multiple values of the same data type in a single variable. When an array is partially initialized, it means that only some of its elements are assigned values, while the others are left uninitialized. The goal of this exercise is to identify what value is assigned to uninitialized elements in a partially initialized array.
02

Understanding Uninitialized Elements in Arrays

In programming languages such as C and C++, when an array is partially initialized, the remaining uninitialized elements are automatically set to a default value. For integer arrays, this default value is 0. The same applies to other primitive data types like float and double, where the uninitialized element will be set to 0.0.
03

Example

Let's consider an example where we declare an integer array with a size of 5 and partially initialize it with only 3 values: ```c int myArray[5] = {11, 22, 33}; ``` In this example, the first 3 elements of the array are initialized with the values 11, 22, and 33. The remaining 2 elements are uninitialized. Since this is an integer array, the default value for the uninitialized elements will be 0. Therefore, the complete array will look like this: ```c int myArray[5] = {11, 22, 33, 0, 0}; ```
04

Conclusion

When an array is partially initialized, the uninitialized elements are automatically set to a default value. In the case of an integer array, this default value is 0. The same principle applies to other primitive data types, such as float and double.

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