//CSE240 Spring 2023 HW4 // Enter your name here // State the IDE that you use: Visual Studio or GCC #include  #include  #pragma warning(disable : 4996) // compiler directive for Visual Studio only // Read before you start: // You are given a partially complete program. Complete the functions in order for this program to work successfully. // All instructions are given above the required functions, please read them and follow them carefully. // You shoud not modify the function return types or parameters. // You can assume that all inputs are valid. Ex: If prompted for an integer, the user will input an integer. // You can use only the strlen() of strings.h library to check string length. Do not use any other string functions // because you are supposed to use pointers for this homework. // DO NOT use arrays to store or to index the characters in the string // Additional Note: Your output string WILL end up both uppercase and reversed when you match and concat. // This is expected behavior. // Global Macro Values. They are used to define the size of 2D array of characters #define NUM_STRINGS 4 #define STRING_LENGTH 50 // Forward Declarations void initializeStrings(char[NUM_STRINGS][STRING_LENGTH]); void printStrings(char[NUM_STRINGS][STRING_LENGTH]); void toUppercase(char s[NUM_STRINGS][STRING_LENGTH]); char* reverseOneString(char s[STRING_LENGTH]); void reverseStrings(char strings[NUM_STRINGS][STRING_LENGTH]); void wordMatch(char strings[NUM_STRINGS][STRING_LENGTH], char input[STRING_LENGTH]); void concatStr(char strings[NUM_STRINGS][STRING_LENGTH], char result[NUM_STRINGS * STRING_LENGTH]); // Problem 1: initializeStrings (5 points) // Use pointer 'ptr' to traverse the 2D array of characters variable 'strings' (input from user in main()) and set all characters in each // array to a null terminator so that there is a 4 row and 50 column 2D array full of null terminators. // The null terminator '\0' is used to denote the end of a string. void initializeStrings(char strings[NUM_STRINGS][STRING_LENGTH]) { char* ptr = &strings[0][0]; // Enter the code below } // Problem 2: printStrings (5 points) // Use pointer 'ptr' to traverse the 2D character array 'strings' and print each string. // See the example outputs provided in the word document. Each string should be printed on a new line. void printStrings(char strings[NUM_STRINGS][STRING_LENGTH]) { char* ptr = &strings[0][0]; // Enter the code below } // Problem 3: toUppercase (5 points) // Convert the string in the array 's' to an uppercase string. // Traverse the input using pointer 'p' and covert the character to an uppercase letter if it is lowercase. // You need to write down the code to check whether or not the character is lowercase. // HINT: Use a pointer to change the ASCII value of a character. // The ASCII value of 'a'= 97 and the ASCII value of 'A' = 65 so the difference between them is 32. void toUppercase(char strings[NUM_STRINGS][STRING_LENGTH]) { char* p = &strings[0][0]; // enter code here } // Problem 4: reverseOneString (5 points) // Reverse the string s by using pointer. // Use pointer 'ptr' and 'temp' char to swap 1st char with last, then 2nd char with (last-1) and so on.. // Finally return pointer 'ptr' which points to start of the reversed string. // Hint: You might want to check if your logic works with even as well as odd length string. // You can write test code to print out the reversed string to check if your function works. (Don't include it in final submission) char* reverseOneString(char s[STRING_LENGTH]) { char temp; // not necessary to use this variable char* ptr = &s[0]; // pointer to start of string int len = strlen(s); // Enter the code below } // Problem 5: reverseStrings (5 points) // Reverse all the strings in 'strings[][]' // For each string in 'strings', use the reverseOneString() to reverse it. void reverseStrings(char strings[NUM_STRINGS][STRING_LENGTH]) { // Enter the code below } // Problem 6: wordMatch (5 points) // This function must be working as follows: // 1. Compare the strings in the 2D array with input string // 2. If one of them matches with input string, print "Match found" // 3. Else print "Match not found" // Example: strings array -> ["Hi", "Sun", "Devils"], input -> "Sun" => print "Match found" // Example: strings array -> ["Hi", "Sun", "Devils"], input -> "Hello" => print "Match not found" void wordMatch(char strings[NUM_STRINGS][STRING_LENGTH], char input[STRING_LENGTH]) { char* p = &strings[0][0]; char* ip = input; int flag = 0; // enter code here } // Problem 7: concatStr (10 points) // This function must be working as follows: // 1. Concatenate the string in the array 'strings' together in a sentence. // 2. Store the string to the array 'result'. // 3. Print the string in the array 'result'. // The sample output is shown in document // NOTE: This is the function partially containing what you have implemented so far. // Initialize the array 'result' first before you store a string to it. // You may declare and use more pointers if needed. // Hint: You'll want to pay special attention '\0' characters void concatStr(char strings[NUM_STRINGS][STRING_LENGTH], char result[NUM_STRINGS * STRING_LENGTH]) { char* p_result = result; char* p_input = &strings[0][0]; // enter code here // 1. Initialize result // 2. Append characters in strings array to result using pointers // 3. Print the string in the variable 'result' using pointer. } // You should study and understand how main() works. // *** DO NOT modify it in any way *** int main() { char strings[NUM_STRINGS][STRING_LENGTH]; // will store four strings each with a max length of 34 char strings_Copy[NUM_STRINGS][STRING_LENGTH]; int i; char input[STRING_LENGTH]; char result[NUM_STRINGS * STRING_LENGTH]; printf("CSE240 HW4: Pointers "); initializeStrings(strings); for (i = 0; i < NUM_STRINGS; i++) { printf("Enter a string: "); // prompt for string fgets(input, sizeof(input), stdin); // store input string input[strlen(input) - 1] = '\0'; // convert trailing ' ' char to '\0' (null terminator) strcpy(strings[i], input); // copy input to 2D strings array } //Question 2 printf(" Standard Print: "); printStrings(strings); //Question 3 printf(" Checking conversion to uppercase. "); toUppercase(strings); printStrings(strings); //Question 4/5 printf(" Checking Reversing of Strings. "); reverseStrings(strings); printStrings(strings); //Question 6 printf(" Enter a string to find a match: "); // prompt for string fgets(input, sizeof(input), stdin); // store input string input[strlen(input) - 1] = '\0'; // convert trailing ' ' char to '\0' (null terminator) // Word match function call wordMatch(strings, input); //Question 7 printf(" The concatenated string is: "); concatStr(strings, result); printf(" "); return 0; }