feat: Solutions to C Strings problem sets 2-6

Author: NadidLinchestein

Unit 2/Exercises/C Strings/2.c

@@ -0,0 +1,31 @@
+/*
+    Write a program in C to find the length of a string without using library function.
+
+    Test Data:
+    Input the string: w3resource.com
+
+    Expected Output: 
+    Length of the string is: 15
+*/
+
+#include <stdio.h>
+
+
+int main() {
+    char str[100];
+    int length = 0;
+
+    // Input the string
+    printf("Input the string: ");
+    fgets(str, sizeof(str), stdin);
+
+    // Find the length of the string
+    while (str[length] != '\0') {
+        length++;
+    }
+
+    // Output the length of the string. Subtracting 1 to ignore the newline character added by fgets
+    printf("Length of the string is: %d\n", length - 1);
+    
+    return 0;
+}

Unit 2/Exercises/C Strings/3.c

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+/*
+    Write a program in C to separate the individual characters from a string.
+    
+    Test Data:
+    Input the string: w3resource.com
+    
+    
+    Expected Output:
+    The characters of the string are: 
+    w  3  r  e  s  o  u  r  c  e  .  c  o  m
+*/
+
+#include <stdio.h>
+
+int main() {
+    char input[100]; // Array to hold the input string
+    int i;           // Loop counter
+
+    // Prompt the user for input
+    printf("Input the string: ");
+    
+    // Read the input string, including spaces, and ensure it doesn't exceed the array size
+    fgets(input, sizeof(input), stdin);
+
+    // Remove the newline character if present
+    for (i = 0; input[i] != '\0'; i++) {
+        if (input[i] == '\n') {
+            
+            // Replace newline with null terminator
+            input[i] = '\0'; 
+            
+            break;
+        }
+    }
+
+    // Display the characters of the string
+    printf("\n");
+    printf("The characters of the string are:\n");
+    
+    for (i = 0; input[i] != '\0'; i++) {
+        // Print each character followed by two spaces
+        printf("%c  ", input[i]);
+    }
+
+    // Add a newline at the end of the output for better formatting
+    printf("\n");
+    
+    return 0;
+}

Unit 2/Exercises/C Strings/4.c

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+/*
+    Write a program in C to print individual characters of string in reverse order.
+
+    Test Data:
+    Input the string: w3resource.com
+
+    Expected Output:
+    The characters of the string in reverse are:
+    m  o  c  .  e  c  r  u  o  s  e  r  3  w
+*/
+
+
+#include <stdio.h>
+#include <string.h>
+
+int main() {
+    char input[100]; // Array to hold the input string
+    int length;      // Variable to store the length of the string
+
+    // Prompt the user for input
+    printf("Input the string: ");
+    fgets(input, sizeof(input), stdin);
+
+    // Remove the newline character if present
+    length = strlen(input);
+    
+    if (input[length - 1] == '\n') {
+        // Replace newline with null terminator
+        input[length - 1] = '\0';   
+        
+        // Adjust the length
+        length--;                 
+    }
+
+    // Display the characters of the string in reverse
+    printf("\nThe characters of the string in reverse are:\n");
+    
+    for (int i = length - 1; i >= 0; i--) {
+        // Print each character followed by two spaces
+        printf("%c  ", input[i]);
+    }
+
+    // Add a newline at the end for proper formatting
+    printf("\n");
+
+    return 0;
+}

Unit 2/Exercises/C Strings/5.c

@@ -0,0 +1,43 @@
+/*
+    Write a program in C to count the total number of words in a string.
+
+    Test Data:
+    Input the string: This is w3resource.com
+
+    Expected Output:
+    Total number of words in the string is: 3 
+*/
+
+#include <stdio.h>
+#include <string.h>
+
+int main()
+{
+    char input[100];     // Array to store the input string
+    int wordCount = 0;   // Counter for the total number of words
+    int inWord = 0;      // Flag to check if currently inside a word
+
+    // Prompt user for input & Read the input string including spaces
+    printf("Input the string: ");
+    fgets(input, sizeof(input), stdin); 
+
+    // Loop through each character in the input string
+    for (int i = 0; input[i] != '\0'; i++) {  
+
+        // Check for whitespace characters (space, newline, or tab)
+        if (input[i] == ' ' || input[i] == '\n' || input[i] == '\t') {
+            // Mark as outside a word
+            inWord = 0; 
+
+        } else if (inWord == 0) {
+            // A non-whitespace character marks the start of a new word
+            inWord = 1;     // Mark as inside a word
+            wordCount++;    // Increment the word count
+        }
+    }
+
+    // Display the result
+    printf("Total number of words in the string is: %d\n", wordCount);
+
+    return 0;
+}

Unit 2/Exercises/C Strings/6.c

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+/*
+    Write a program in C to compare two strings without using string library functions.
+
+    Test Data:
+    Check the length of two strings:
+    --------------------------------
+    Input the 1st string: aabbcc
+    Input the 2nd string: abcdef
+    String1: aabbcc
+    String2: abcdef
+
+    Expected Output:
+    Strings are not equal.
+
+    Check the length of two strings:
+    --------------------------------
+    Input the 1st string: aabbcc
+    Input the 2nd string: aabbcc
+    String1: aabbcc
+    String2: aabbcc
+
+    Expected Output:
+    Strings are equal.
+*/
+
+#include <stdio.h>
+
+int compareStrings(char str1[], char str2[]) {
+    int i = 0;
+
+    // Compare characters one by one
+    while (str1[i] != '\0' && str2[i] != '\0') {
+        if (str1[i] != str2[i]) {
+            return 0; // Strings are not equal
+        }
+        i++;
+    }
+
+    // Check if both strings reached the end
+    if (str1[i] == '\0' && str2[i] == '\0') {
+        return 1; // Strings are equal
+    } else {
+        return 0; // Strings are not equal
+    }
+}
+
+int main() {
+    char str1[100], str2[100];
+
+    printf("Check the length of two strings:\n");
+    printf("--------------------------------\n");
+
+    // Input first string
+    printf("Input the 1st string: ");
+    scanf("%s", str1);
+
+    // Input second string
+    printf("Input the 2nd string: ");
+    scanf("%s", str2);
+
+    // Display the strings
+    printf("String1: %s\n", str1);
+    printf("String2: %s\n", str2);
+
+    // Compare strings and display result
+    if (compareStrings(str1, str2)) {
+        printf("Strings are equal.\n");
+    } else {
+        printf("Strings are not equal.\n");
+    }
+
+    return 0;
+}