Character arrays, strings, automatically have the null character appended as the final element in the array. To swap array elements, you need another variable, one of the same data type. Like any variable, an array's elements must be initialized before they're used. Arrays can be duplicated, providing the target array has at least as many elements as the original.
- [Instructor] Elements in an array operate … like any individual variable. … Modifying an array element is a familiar operation, … though array notation may be new to you. … In this code, the pet array … is declared with four elements assigned, … characters k, a, t, at line five. … Because the assignment is a string literal, … the compiler adds a null character … as the fourth character and forth array element. … At line eight, element zero is changed to letter c. … Single quotes delineate the character literal value. … Build and run. … Cat and cat. … Here you see an integer array, numbers. … It's preset to five values. … Lines 14, 15, and 16 swap two of the values. … First, the value of the fourth element … is saved in the temp variable. … Next, the third element is placed into the fourth element, … and last, the third element's value is set … to temp's variable's value. … The two for loops display the before … and after values of the array. … Build and run. … And you see that values 88 …
Author
Dan Gookin
Released
5/1/2019- Working with arrays
- Building a structure
- Creating an array of structures
- Testing characters
- Working with strings in C
- Using pointers to manipulate data
- Manipulating files
- Using command-line arguments
- Working with time functions
Skill Level Intermediate
Duration
Views
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Introduction
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Using the exercise files1m 23s
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Configuring the IDE2m 34s
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1. Arrays and Structures
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Understanding arrays2m 59s
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Working with arrays3m 5s
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Modifying arrays3m 11s
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Building a structure3m 23s
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Nesting structures2m 56s
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Understanding a union2m 47s
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2. Characters and Strings
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Testing characters2m 34s
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Fetching string input3m 18s
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Sending string output2m 46s
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Using printf() placeholders3m 36s
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Exploring string functions3m 29s
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Manipulating strings3m 53s
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Avoiding string problems2m 27s
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3. Pointers
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Understanding pointers3m 19s
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Doing pointer math2m 57s
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Allocating storage3m 15s
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Working with a pointer array3m 38s
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Using pointers in structures3m 30s
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Returning pointers2m 39s
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4. Files and the Operating System
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Reading from a file3m 25s
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Writing to a file3m 24s
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Working with raw data2m 53s
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Using random file access2m 47s
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Manipulating files2m 57s
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Exploring the path2m 8s
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Reading a directory2m 53s
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Getting file information2m 46s
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Using command line arguments2m 44s
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Calling the operating system2m 46s
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5. The Interesting and Extraordinary
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Solving math puzzles3m 32s
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Creating random numbers3m 42s
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Working with time functions3m 54s
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Sorting data4m 8s
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Using a debugger4m 53s
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Writing your own header file2m 53s
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Challenge: Lotto simulation1m 18s
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Solution: Lotto simulation2m 29s
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Conclusion
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Next steps1m 52s
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Video: Modifying arrays