Lesson 2. Practice solution

02-Git/.gitignore

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+.idea
+out
+

02-Git/Makefile

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+OBJ_DIR=out
+
+CC=gcc
+CFLAGS=-I. -I/usr/local/include -Wall -Werror
+DEPS =
+
+CSRC = ${wildcard *.c}
+OBJECTS = ${addprefix ${OBJ_DIR}/, ${patsubst %.c, %.o, ${CSRC}}}
+
+${OBJ_DIR}/%.o: %.c ${DEPS}
+	${CC} -c $< ${CFLAGS} -o $@
+
+all: folders ${OBJECTS}
+	${CC} ${OBJECTS} -L/usr/local/lib -lreadline -o ${OBJ_DIR}/guess
+
+folders:
+	mkdir -p ${OBJ_DIR}
+
+clean: folders
+	rm -rf ${OBJ_DIR}/*
+
+.PHONY: clean all folders
+

02-Git/README.md

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+# Homework
+Create a question-answer game (e.g. guess a number, paper-rock-scissors etc).
+
+1. Main goal is not the game itself, but the proper commit structure.
+2. Minimum 3 commits.
+3. Follow all the rules.

02-Git/main.c

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+#include <stdlib.h>
+#include <stdio.h>
+#include <limits.h>
+#include <errno.h>
+#include <time.h>
+#include <readline/readline.h>
+
+static const int max_number = 10;
+static const int min_number = 1;
+
+void promt( char** out_result );
+int parser( char* user_input );
+void checker( const int number );
+
+int main(int argc, char *argv[] ) {
+    char* result;
+    int number;
+
+    promt( &result );
+    number = parser( result );
+    checker( number );
+    return EXIT_SUCCESS;
+}
+
+void promt( char** out_result ) {
+    printf("Guess the number from %d to %d, dude !\n", min_number, max_number);
+    printf("Type it and press enter or type exit to exit:\n");
+    *out_result = readline("> ");
+}
+
+int parser( char* user_input ) {
+    int user_number;
+    char* pend;
+
+    if( strcmp(user_input, "exit" ) == 0 ) {
+        printf("Exiting...Bye !\n");
+        exit( EXIT_SUCCESS );
+    }
+
+    errno = 0;
+    user_number = strtol( user_input, &pend, 10 );
+    if( *pend != '\0' ) {
+        printf( "Invalid input: not number\n" );
+        exit( EXIT_FAILURE);
+    }
+    /* Check for various possible errors */
+    if( ( errno == ERANGE && ( user_number == LONG_MAX || user_number == LONG_MIN ) )
+        || ( errno != 0 && user_number == 0 ) || ( user_number > max_number ) || ( user_number < min_number ) ) {
+        printf( "Invalid input: out of range\n" );
+        exit( EXIT_FAILURE);
+    }
+    printf( "Nice try from you: %d\n", user_number );
+    return user_number;
+}
+
+void checker( const int number ) {
+    int random_number;
+
+    srand( time( NULL ) );
+    do {
+        random_number = rand() % ( max_number + 1 );
+    } while( random_number < min_number || random_number > max_number );
+    printf( "Random is: %d\n", random_number );
+    if( number == random_number ) {
+        printf( "Congratulations ! ! ! You've guessed it ! ! !\n" );
+    }
+    else {
+        printf( "Ahhh... You've missed - try nex time !\n" );
+    }
+}
+