first commit

FizzBuzz/C/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+
+# Modify only these if one source file!
+project(CFizzBuzz)
+set(CURRENT_PROJECT_CODE_NAME fizzbuzz)
+set(FILE_EXT c)
+# End
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_C_STANDARD_REQUIRED True)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
+# We want all the warnings and as errors enabled
+if (MSVC)
+    # warning level 4 and all warnings as errors
+    add_compile_options(/W4 /WX)
+else()
+    # lots of warnings and all warnings as errors
+    add_compile_options(-Wall -Wextra -pedantic -Werror)
+endif()
+
+add_executable(${CMAKE_PROJECT_NAME} ${CMAKE_CURRENT_LIST_DIR}/${CURRENT_PROJECT_CODE_NAME}.${FILE_EXT})
+
+target_include_directories(${CMAKE_PROJECT_NAME} PUBLIC
+					    ${EXTRA_INCLUDES}
+						)
+
+target_link_libraries(${CMAKE_PROJECT_NAME} PUBLIC 
+						${EXTRA_LIBS}
+						)
+						
+

FizzBuzz/C/fizzbuzz.c

@@ -0,0 +1,132 @@
+#include <stdio.h>
+#include <time.h>
+
+void fizzbuzz(int n)
+{
+    int i;
+    for (i = 1; i <= n; i++)
+    {
+        if (i%3 == 0 || i%5 == 0)
+        {
+            if (i % 3 == 0 && i % 5 == 0)
+                printf("fizzbuzz\n");
+            else if (i%3==0)
+                printf("fizz\n");
+            else
+                printf("buzz\n");
+        }
+        else
+        {
+            printf("%d\n", i);
+        }
+    }
+}
+
+#define BUF_SIZE 1024
+
+void fizzbuzz_fast(int n)
+{
+    int i;
+    
+    char str[BUF_SIZE];
+    int curr_str_pos = 0;
+
+    for (i = 1; i <= n; i++)
+    {
+        if (i % 3 == 0 || i % 5 == 0)
+        {
+            char* strToPrint;
+            int result;
+
+            if (i % 3 == 0 && i % 5 == 0)
+            {
+                strToPrint = "fizzbuzz\n";
+            }
+            else if (i % 3 == 0)
+            {
+                strToPrint = "fizz\n";
+            }
+            else
+            {
+                strToPrint = "buzz\n";
+            }
+
+            result = snprintf(str + curr_str_pos, BUF_SIZE - curr_str_pos, "%s", strToPrint);
+            if (!(result < BUF_SIZE - curr_str_pos))
+            {
+                printf("%s", str);
+                curr_str_pos = 0;
+                result = snprintf(str + curr_str_pos, BUF_SIZE - curr_str_pos, "%s", strToPrint);
+            }
+            curr_str_pos += result;
+        }
+        else
+        {
+            int result;
+            result = snprintf(str + curr_str_pos, BUF_SIZE - curr_str_pos, "%d\n", i);
+            
+            if (!(result < BUF_SIZE - curr_str_pos))
+            {
+                printf("%s", str);
+                curr_str_pos = 0;
+                result = snprintf(str + curr_str_pos, BUF_SIZE - curr_str_pos, "%d\n", i);
+            }
+            curr_str_pos += result;
+        }
+    }
+
+    if (curr_str_pos != 0)
+    {
+        printf("%s", str);
+    }
+}
+
+void fizzbuzz_branchless(int n)
+{
+    char *zzc[]={"fizz\n","buzz\n","fizzbuzz\n","%d\n"};
+    int zxc[]={3,0,0,1,0,0,2};
+    for (int i = 1; i < n; ++i)
+    {
+        int a=i%3==0;
+        int b=i%5==0;
+        int t=b^a;
+        printf(zzc[zxc[a<<2|(b<<1)|t]],i);
+    }
+}
+
+int main(int argc, char **argv)
+{
+	(void)argc;
+	(void)argv;
+	
+    int n;
+	
+	clock_t reg_start, reg_end, branchless_start, branchless_end, fast_start, fast_end;
+	
+    printf("How many fizzbuzzes?: ");
+    int ret = scanf("%d", &n);
+    if (ret)
+    {
+        reg_start = clock();
+        fizzbuzz(n);
+        reg_end = clock();
+
+        branchless_start = clock();
+        fizzbuzz_branchless(n);
+        branchless_end = clock();
+
+        fast_start = clock();
+        fizzbuzz_fast(n);
+        fast_end = clock();
+
+        printf("regular time: %ld\n", reg_end - reg_start);
+        printf("branchless time: %ld\n", branchless_end - branchless_start);
+        printf("fast time: %ld\n", fast_end - fast_start);
+    }
+    else
+    {
+        printf("Invalid input\n");
+    }
+    
+    return 0;
+}