Character Arrays and String Basics
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When you work with strings in C, you are really working with arrays of characters rather than a specialized string type. Unlike higher-level languages such as Python, which provide built-in string objects with many features, C uses a much more direct approach: a string is just a sequence of characters stored in memory, ending with a special character to mark where the string finishes.
main.c
1234567#include <stdio.h> int main() { char greeting[] = "Hello"; printf("%s\n", greeting); return 0; }
In this example, the character array greeting is initialized with the string "Hello". Each character from the string—including the invisible null-terminator at the end—is stored in consecutive elements of the array. So, the array actually contains six elements: the letters 'H', 'e', 'l', 'l', 'o', and the null-terminator character \0. The array size must be large enough to hold all these characters, including the null-terminator, or the string will not be properly recognized by C's string functions.
main.c
123456// This example shows how to manually initialize a character array to represent a string in C. // Notice that we include the null-terminator '\0' at the end of the array. char word[6] = { 'H', 'e', 'l', 'l', 'o', '\0' }; // The array 'word' now holds the string "Hello" as a sequence of characters, // with the final '\0' marking the end of the string.
Here, you see each character placed into the array by hand, with the null-terminator \0 added at the end. The null-terminator is crucial because it signals the end of the string to C's string-handling functions. Without this character, functions that process the string would not know where the string ends and might continue reading into other memory, leading to unpredictable results or errors.
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