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DS/C/Lab/Week2/StringHandler.c

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+#include <stdio.h>
+
+int string_length(char str[]) {
+    int length = 0;
+    while (str[length] != '\0') {
+        length++;
+    }
+    return length;
+}
+
+void string_concatenate(char str1[], char str2[], char result[]) {
+    int i = 0, j = 0;
+    while (str1[i] != '\0') {
+        result[j++] = str1[i++];
+    }
+    i = 0;
+    while (str2[i] != '\0') {
+        result[j++] = str2[i++];
+    }
+    result[j] = '\0';
+}
+
+int string_compare(char str1[], char str2[]) {
+    int i = 0;
+    while (str1[i] != '\0' && str2[i] != '\0') {
+        if (str1[i] != str2[i]) {
+            return (str1[i] < str2[i]) ? -1 : 1;
+        }
+        i++;
+    }
+    if (str1[i] == '\0' && str2[i] == '\0') {
+        return 0;
+    } else if (str1[i] == '\0') {
+        return -1;
+    } else {
+        return 1;
+    }
+}
+
+void string_insert(char str[], char substr[], int pos, char result[]) {
+    int i = 0, j = 0, k = 0;
+    int str_length = string_length(str);
+    int substr_length = string_length(substr);
+
+    while (i < pos && i < str_length) {
+        result[j++] = str[i++];
+    }
+    while (substr[k] != '\0') {
+        result[j++] = substr[k++];
+    }
+    while (i < str_length) {
+        result[j++] = str[i++];
+    }
+    result[j] = '\0';
+}
+
+void string_delete(char str[], int pos, int length, char result[]) {
+    int i = 0, j = 0;
+    int str_length = string_length(str);
+
+    while (i < pos && i < str_length) {
+        result[j++] = str[i++];
+    }
+    i += length;
+    while (i < str_length) {
+        result[j++] = str[i++];
+    }
+    result[j] = '\0';
+}
+
+int main() {
+    char str1[100], str2[100], result[200];
+    int choice, pos, length;
+
+    printf("Enter the first string: ");
+    scanf("%99s", str1);
+    printf("Enter the second string: ");
+    scanf("%99s", str2);
+
+    printf("\nChoose an operation:\n");
+    printf("1. Length of the first string\n");
+    printf("2. Concatenate strings\n");
+    printf("3. Compare strings\n");
+    printf("4. Insert second string into first string at position\n");
+    printf("5. Delete substring from first string\n");
+    printf("Enter your choice: ");
+    scanf("%d", &choice);
+
+    switch (choice) {
+        case 1:
+            printf("Length of the first string: %d\n", string_length(str1));
+            break;
+        case 2:
+            string_concatenate(str1, str2, result);
+            printf("Concatenated string: %s\n", result);
+            break;
+        case 3:
+            printf("String comparison result: %d\n", string_compare(str1, str2));
+            break;
+        case 4:
+            printf("Enter position to insert the second string: ");
+            scanf("%d", &pos);
+            string_insert(str1, str2, pos, result);
+            printf("String after insertion: %s\n", result);
+            break;
+        case 5:
+            printf("Enter position to start deletion: ");
+            scanf("%d", &pos);
+            printf("Enter length of substring to delete: ");
+            scanf("%d", &length);
+            string_delete(str1, pos, length, result);
+            printf("String after deletion: %s\n", result);
+            break;
+        default:
+            printf("Invalid choice.\n");
+    }
+
+    return 0;
+}