add cviko 2

Cviko2_1/.gitignore

@@ -0,0 +1,93 @@
+# Created by https://www.toptal.com/developers/gitignore/api/c,visualstudiocode,linux
+# Edit at https://www.toptal.com/developers/gitignore?templates=c,visualstudiocode,linux
+
+### C ###
+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/*.code-snippets
+
+# Local History for Visual Studio Code
+.history/
+
+# Built Visual Studio Code Extensions
+*.vsix
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+.ionide
+
+# End of https://www.toptal.com/developers/gitignore/api/c,visualstudiocode,linux
+main

Cviko2_1/Makefile

@@ -0,0 +1,13 @@
+all: main
+
+CC = gcc
+override CFLAGS += -Wall -Wextra -Wno-unused-variable -Wno-unused-parameter -Wno-unused-result -Wno-unknown-pragmas -pedantic -lm
+
+main: main.c
+	$(CC) $(CFLAGS) -O1 ./*.c -o "$@"
+
+main-debug: main.c
+	$(CC) $(CFLAGS) -O1 -g ./*.c -o "$@"
+
+clean:
+	rm -f main main-*

Cviko2_1/main.c

@@ -0,0 +1,105 @@
+#include "types.h"
+#include <math.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+void read_print_quadratic() {
+  // TODO 1. Read 3 numbers: a, b and c which represent known numbers for
+  // quadratic equation in standard format (ax^2 + bx + c = 0) from stdin.
+  printf("Enter numbers a, b and c of equation ax^2 +bx + c = 0:\n");
+  int a, b, c;
+  scanf("%d %d %d", &a, &b, &c);
+
+  // TODO 2. Check if equation is quadratic. If so, calculate its discriminant
+  // and, if possible, print all roots to stdout.
+  if (a == 0 || (a == 0 && b == 0 && c == 0)) {
+    printf("Please enter a cooler formula");
+    return;
+  }
+
+  double d = b * b + (-4) * a * c;
+  printf("Discriminant: %.2f\n", d);
+
+  if (d < 0) {
+    printf("Discriminant is lower than 0, cannot solve equation in R");
+    return;
+  }
+
+  double rootA, rootB;
+
+  rootA = (-b + sqrt(d)) / (2*a);
+  rootB = (-b - sqrt(d)) / (2*a);
+
+  if (rootA == rootB) {
+    printf("Equation has one solution: %.2f", rootA);
+  } else {
+    printf("Equation has two solution: %.2f and %.2f", rootA, rootB);
+  }
+  return;
+}
+
+void read_print_is_character() {
+  // TODO 1. Read one character from stdin.
+  printf("Enter a character:\n");
+  char l;
+  scanf(" %c", &l);
+  // TODO 2. Determine whether the character represents a letter (a-z, A-Z) or
+  // not and print the result to stdout.
+  if ((l >= 'a' && l <= 'z') || (l >= 'A' && l <= 'Z')) {
+    printf("%c IS a letter (a-z or A-Z)", l);
+  } else {
+    printf("%c is NOT a letter (a-z or A-Z)", l);
+  }
+  return;
+}
+
+void read_print_factorial() {
+  printf("Enter a number for calcuation of factorial:\n");
+  // TODO 1. Read one number from stdin.
+  int a;
+  scanf("%d", &a);
+
+  // TODO 2. Print its factorial (!) to stdout.
+  for (int i = a - 1; i != 0; --i) {
+    a *= i;
+  }
+  printf("Factorial: %d", a);
+  return;
+}
+
+void read_print_gcd() {
+  // TODO 1. Read two numbers from stdin.
+  printf("Enter two numbers to calculate gcd:\n");
+  int a, b;
+  scanf("%d %d", &a, &b);
+
+  // see https://en.wikipedia.org/wiki/Greatest_common_divisor#Euclidean_algorithm
+  while (b != 0) {
+        int temp = b;
+        b = a % b;
+        a = temp;
+    }
+
+  printf("gcd is %d\n", a);
+  return;
+}
+
+#ifndef TEST_BUILD
+
+int main() {
+  printf("\n--read_print_quadratic--\n");
+  read_print_quadratic();
+
+  printf("\n--read_print_is_character--\n");
+  read_print_is_character();
+
+  printf("\n--read_print_factorial--\n");
+  read_print_factorial();
+
+  printf("\n--read_print_gcd--\n");
+  read_print_gcd();
+
+  return 0;
+}
+
+#endif

Cviko2_1/types.h

@@ -0,0 +1,11 @@
+// OBSAH V TOMTO SOUBROU NEUPRAVUJTE!
+#ifndef TYPES_H
+#define TYPES_H
+
+  void read_print_quadratic();
+  void read_print_is_character();
+  void read_print_is_even();
+  void read_print_factorial();
+  void read_print_gcd();
+
+#endif