Добавить task4.cpp

task1.cpp

@@ -1,77 +1,21 @@
-//#include <iostream>
-//
-//using namespace std;
-//
-//int main() {
-//	int s;
-//	cout << "Size: ";
-//	cin >> s;
-//	int t;
-//	cout << "Shape (1-left,2-right,3-up,4-down,5-square): ";
-//	cin >> t;
-//	if (s < 1) return 0;
-//	switch (t) {
-//	case 1: {
-//		int i;
-//		int j;
-//		for (i = 1; i <= s; i++) {
-//			for (j = 1; j <= i; j++) cout << "*";
-//			cout << "\n";
-//		}
-//		break;
-//	}
-//	case 2: {
-//		int i;
-//		int j;
-//		for (i = 1; i <= s; i++) {
-//			for (j = 1; j <= s - i; j++) cout << " ";
-//			for (j = 1; j <= i; j++) cout << "*";
-//			cout << "\n";
-//		}
-//		break;
-//	}
-//	case 3: {
-//		int i;
-//		int j;
-//		int k;
-//		for (i = 1; i <= s; i++) {
-//			for (j = 1; j <= s - i; j++) cout << " ";
-//			for (k = 1; k <= 2 * i - 1; k++) cout << "*";
-//			cout << "\n";
-//		}
-//		break;
-//	}
-//	case 4: {
-//		int i;
-//		int j;
-//		int k;
-//		for (i = s; i >= 1; i--) {
-//			for (j = 1; j <= s - i; j++) cout << " ";
-//			for (k = 1; k <= 2 * i - 1; k++) cout << "*";
-//			cout << "\n";
-//		}
-//		break;
-//	}
-//	case 5: {
-//		int i;
-//		int j;
-//		int k;
-//		for (i = s; i >= 1; i--) {
-//			for (j = 1; j <= s - i; j++) cout << " ";
-//			for (k = 1; k <= 2 * i - 1; k++) cout << "*";
-//			cout << "\n";
-//		}
-//		for (i = 1; i <= s; i++) {
-//			for (j = 1; j <= s - i; j++) cout << " ";
-//			for (k = 1; k <= 2 * i - 1; k++) cout << "*";
-//			cout << "\n";
-//		}
-//		break;
-//	}
-//	default: {
-//		cout << "Wrong choice\n";
-//		break;
-//	}
-//	}
-//	return 0;
-//}
+#include <iostream>
+#define SIZE 80
+using namespace std;
+
+int main()
+{
+    char str[SIZE];
+    cout << "Input string: ";
+    cin.getline(str, SIZE);
+
+    int i = 0;
+    while (str[i] != '\0') {
+        if (str[i] == ' ') {
+            str[i] = '\t';
+        }
+        ++i;
+    }
+
+    cout << "Modified string: " << str << endl;
+    system("pause");
+}

task2.cpp

@@ -1,40 +1,53 @@
-//#include <iostream>
-//
-//using namespace std;
-//
-//int main() {
-//	long long x;
-//	cout << "Number: ";
-//	cin >> x;
-//	long long y;
-//	y = llabs(x);
-//	if (y == 0) {
-//		cout << "Digits: 1\n";
-//		cout << "Sum: 0\n";
-//		cout << "Avg: 0\n";
-//		cout << "Zeros: 1\n";
-//		return 0;
-//	}
-//	int c;
-//	c = 0;
-//	int s;
-//	s = 0;
-//	int z;
-//	z = 0;
-//	while (y > 0) {
-//		int d;
-//		d = y % 10;
-//		s += d;
-//		if (d == 0) z++;
-//		y /= 10;
-//		c++;
-//	}
-//	double a;
-//	a = (c == 0) ? 0.0 : (double)s / c;
-//	cout << "Digits: " << c << "\n";
-//	cout << "Sum: " << s << "\n";
-//	cout << "Avg: " << a << "\n";
-//	cout << "Zeros: " << z << "\n";
-//	return 0;
-//}
-//
+#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() {
+    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");
+}

task3.cpp

@@ -1,19 +0,0 @@
-//#include <iostream>
-//
-//using namespace std;
-//
-//int main() {
-//	int k;
-//	k = 0;
-//	for (int i = 100; i <= 999; i++) {
-//		int a;
-//		a = i / 100;
-//		int b;
-//		b = (i / 10) % 10;
-//		int c;
-//		c = i % 10;
-//		if (a != b && a != c && b != c) k++;
-//	}
-//	cout << k << "\n";
-//	return 0;
-//}

task4.cpp

@@ -1,18 +1,53 @@
-#include <iostream>
-
-using namespace std;
-
-int main() {
-	long long n;
-	cout << "Number: ";
-	cin >> n;
-	long long m;
-	m = llabs(n);
-	if (m == 0) {
-		cout << "All integers divide 0\n";
-		return 0;
-	}
-	for (long long i = 1; i <= m; i++) if (m % i == 0) cout << i << " ";
-	cout << "\n";
-	return 0;
+#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 = 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");
 }