Passing Strings to Functions in C

• Passing strings to functions in C involves sending the memory address of the first character of the string to the function rather than passing the entire string itself.
• C does not have built-in string types, so strings are represented as arrays of characters, and passing the array's address allows functions to manipulate the original string.
• Syntax:
  Function Declaration:
  void myFunction(char *str);
  Function Definition:
  void myFunction(char *str) {
  // Function body
  }
  Function Call:
  char myString[] = "Hello, World!";
  myFunction(myString);
  
• Strings in C are represented as arrays of characters, and their name is a pointer to the first character.
• When passing a string to a function, use a pointer parameter to receive the memory address of the first character of the string.
• The function can now access and modify the original string through the provided pointer.
• Any changes made to the string within the function are reflected outside the function since the function operates on the original memory.
• Passing by reference is more efficient than passing by value for large strings because it avoids copying the entire string.
Program.c
#include <stdio.h> // Function to modify the passed string void modifyString(char *str) { // Appending " (modified)" to the string strcat(str, " (modified)"); } int main() { // Declare and initialize a string char myString[] = "Hello, World"; // Print the original string printf("Original String: %s\n", myString); // Call the function to modify the string modifyString(myString); // Print the modified string printf("Modified String: %s\n", myString); return 0; }

Output:
Original String: Hello, World
Modified String: Hello, World (modified)