Добавить task4.cpp

task1.cpp

@@ -1,20 +1,21 @@
 #include <iostream>
+#define SIZE 80
 using namespace std;
 
-int main() {
-    int n;
-    cout << "Enter a four-digit number: ";
-    cin >> n;
+int main()
+{
+    char str[SIZE];
+    cout << "Input string: ";
+    cin.getline(str, SIZE);
 
-    if (n < 1000 || n > 9999) {
-        cout << "Error! This is not a four-digit number." << endl;
-    } else {
-        int a = n / 1000;
-        int b = (n / 100) % 10;
-        int c = (n / 10) % 10;
-        int d = n % 10;
-        int r = c * 1000 + d * 100 + a * 10 + b;
-        cout << "Result: " << r << endl;
+    int i = 0;
+    while (str[i] != '\0') {
+        if (str[i] == ' ') {
+            str[i] = '\t';
         }
-    return 0;
+        ++i;
+    }
+
+    cout << "Modified string: " << str << endl;
+    system("pause");
 }

task2.cpp

@@ -1,39 +1,53 @@
+#pragma warning(disable : 4996)
+#define SIZE 80
 #include <iostream>
 using namespace std;
 
+int mystrlen(const char* str) {
+    int len = 0;
+    for (; str[len] != '\0'; ++len) {}
+    return len;
+}
+
+char* mystrcat(char* str1, const char* str2) {
+    int i = mystrlen(str1);
+    int j;
+    for (j = 0; str2[j] != '\0'; ++j) {
+        str1[i + j] = str2[j];
+    }
+    str1[i + j] = '\0';
+    return str1;
+}
+
+char* mystrchr(char* str, char s) {
+    for (int i = 0; str[i] != '\0'; ++i) {
+        if (str[i] == s) {
+            return &str[i];
+        }
+    }
+    return 0;
+}
+
 int main() {
-    double ab;
-    double bc;
-    double weight;
-    cout << "Distance A-B: ";
-    cin >> ab;
-    cout << "Distance B-C: ";
-    cin >> bc;
-    cout << "Cargo weight: ";
-    cin >> weight;
+    char str1[SIZE];
+    char str2[SIZE];
+    cout << "Input first string: ";
+    cin.getline(str1, SIZE);
+    cout << "Input second string: ";
+    cin.getline(str2, SIZE);
 
-    double fuel;
-    if (weight <= 500) fuel = 1;
-    else if (weight <= 1000) fuel = 4;
-    else if (weight <= 1500) fuel = 7;
-    else if (weight <= 2000) fuel = 9;
-    else {
-        cout << "The airplane cannot lift such a load!" << endl;
-        return 0;
-    }
+    cout << "mystrlen(str1): " << mystrlen(str1) << endl;
+    cout << "mystrcat(str1, str2): " << mystrcat(str1, str2) << endl;
 
-    double nAB = ab * fuel;
-    double nBC = bc * fuel;
-
-    if (nAB > 300) {
-        cout << "It is impossible to reach point B by flight." << endl;
-    }
-    else if (nBC > 300) {
-        cout << "It is impossible to fly from B to C." << endl;
+    char ch;
+    cout << "Input char to search in str1: ";
+    cin >> ch;
+    char* f = mystrchr(str1, ch);
+    if (f) {
+        cout << "mystrchr(str1, '" << ch << "): " << f << endl;
     }
     else {
-        double fill = max(0.0, nBC - (300 - nAB));
-        cout << "Minimum refuel at B: " << fill << " liters." << endl;
+        cout << "mystrchr(str1, '" << ch << "): 0" << endl;
     }
-    return 0;
+    system("pause");
 }

task3.cpp

@@ -1,55 +0,0 @@
-#include <iostream>
-#include <clocale>
-using namespace std;
-
-int main() {
-    int c;
-    cout << "Menu:" << endl;
-    cout << "1. Income and delays -> lines of code" << endl;
-    cout << "2. Lines of code and desired salary -> delay" << endl;
-    cout << "3. Lines of code and delays -> salary" << endl;
-    cin >> c;
-
-    int l;
-    int t;
-    int s;
-
-    switch (c) {
-        case 1:
-            cout << "Enter the desired income ($): ";
-            cin >> s;
-            cout << "Enter the number of tardies: ";
-            cin >> t;
-            s += (t / 3) * 20;
-            l = (s / 50.0) * 100;
-            cout << "Vasyl needs to write " << l << " lines of code." << endl;
-            break;
-
-        case 2:
-            cout << "Enter the number of lines of code: ";
-            cin >> l;
-            cout << "Enter your desired salary ($): ";
-            cin >> s;
-            int b;
-            b = (l / 100) * 50;
-            cout << "Vasya can be late at most "
-                 << ((b - s) / 20) * 3 << " time(s)." << endl;
-            break;
-
-        case 3:
-            cout << "Enter the number of lines of code: ";
-            cin >> l;
-            cout << "Enter the number of tardies: ";
-            cin >> t;
-            s = (l / 100) * 50 - (t / 3) * 20;
-            if (s > 0)
-                cout << "Vasyl's salary: " << s << " $" << endl;
-            else
-                cout << "Vasya will not be paid anything." << endl;
-            break;
-
-        default:
-            cout << "Invalid choice." << endl;
-    }
-    return 0;
-}

task4.cpp

@@ -1,19 +1,53 @@
+#pragma warning(disable : 4996)
+#define SIZE 80
 #include <iostream>
-#include <clocale>
 using namespace std;
 
-int main() {
-    int f;
-    cout << "Enter the finger number (1-5): ";
-    cin >> f;
+int mystrlen(const char* str) {
+    int len = 0;
+    for (; str[len] != '\0'; ++len) {}
+    return len;
+}
 
-    switch (f) {
-        case 1: cout << "pollex" << endl; break;
-        case 2: cout << "index" << endl; break;
-        case 3: cout << "medius" << endl; break;
-        case 4: cout << "annularis" << endl; break;
-        case 5: cout << "digitus minimus" << endl; break;
-        default: cout << "Incorrect number!" << endl;
+char* mystrcat(char* str1, const char* str2) {
+    int i = mystrlen(str1);
+    int j = mystrlen(str2);
+    for (int k = 0; k < j; ++k) {
+        str1[i + k] = str2[k];
+    }
+    str1[i + j] = '\0';
+    return str1;
+}
+
+char* mystrchr(char* str, char s) {
+    for (int i = 0; str[i] != '\0'; ++i) {
+        if (str[i] == s) {
+            return &str[i];
+        }
     }
     return 0;
 }
+
+int main() {
+    char str1[SIZE];
+    char str2[SIZE];
+    cout << "Input first string: ";
+    cin.getline(str1, SIZE);
+    cout << "Input second string: ";
+    cin.getline(str2, SIZE);
+
+    cout << "mystrlen(str1): " << mystrlen(str1) << endl;
+    cout << "mystrcat(str1, str2): " << mystrcat(str1, str2) << endl;
+
+    char ch;
+    cout << "Input char to search in str1: ";
+    cin >> ch;
+    char* f = mystrchr(str1, ch);
+    if (f) {
+        cout << "mystrchr(str1, '" << ch << "'): " << f << endl;
+    }
+    else {
+        cout << "mystrchr(str1, '" << ch << "'): 0" << endl;
+    }
+    system("pause");
+}

task5.cpp

@@ -1,35 +0,0 @@
-#include <iostream>
-using namespace std;
-
-int main() {
-    double a;
-    double b;
-    double c;
-    double x;
-    double y;
-
-    cout << "Enter the edges of the brick a, b, c: ";
-    cin >> a >> b >> c;
-    cout << "Enter the hole dimensions x, y: ";
-    cin >> x >> y;
-
-    double min1 = a, min2 = b;
-
-    if (c < min1) {
-        min2 = min1;
-        min1 = c;
-    }
-    else if (c < min2) {
-        min2 = c;
-    }
-
-    if ((min1 <= x && min2 <= y) || (min1 <= y && min2 <= x)) {
-        cout << "The brick will pass through the opening." << endl;
-    }
-    else {
-        cout << "The brick won't fit through the opening.." << endl;
-    }
-
-    return 0;
-
-}