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   • programming C language temperature conversion

     Top Answer

     Answered Aug 06, 2014 · 3 votes

     The %s format specifier is for null-terminated strings only (which have type char*), not single characters (char). For single characters, use %c.

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     1/5

   • Programming a XM1000 Sensor Device in C Programming Language Need if statement

     Top Answer

     Answered Apr 25, 2016 · 0 votes

     Here's what I think it will look like, give or take a little hacking. I've structured the code as a single loop, that just polls all three sensors at 5 second intervals. So every 5 seconds, the on/off status of all three lights might change. I figure for watering a lawn, you don't really need split-second precision in terms of knowing when it got hot, or dark, or whatever.

     Based on your replies in the comments section of the OP, there might have to be some computation done involving the return values of the sensor readings. I figure it's probably easier to do the computation at compile time, so the code is biased that way.

     #include <stdio.h> /* for printf() */ -#include "contiki.h" #include "leds.h"#include "dev/light-sensor.h"#include "dev/sht11-sensor.h"-PROCESS(Led_management_process, "LED Management Process"); AUTOSTART_PROCESSES(&Led_management_process); -static struct etimer Timer; -/* Per the online docs at http://www.advanticsys.com/wiki/index.php?title=TestCM5000- T = -39.6 + 0.01 × SO(T)-So, solving for SOt gives:*/#define degreesC(n) (n)-#define TEMP_D1 degreesC(-39.6)#define TEMP_D2 degreesC(0.01)#define TEMP_THRESHOLD(tempC) (int)(((((double)(tempC))-(TEMP_D1))/(TEMP_D2)))-#define TARGET_TEMP_READING TEMP_THRESHOLD(degreesC(26))-#define LIGHT_LED LEDS_GREEN#define HUM_LED LEDS_BLUE#define TEMP_LED LEDS_RED-PROCESS_THREAD(Led_management_process, ev, data) { static int humidity_led_on = 0; static int light_led_on = 0; static int temp_led_on = 0;- PROCESS_BEGIN(); SENSORS_ACTIVATE(light_sensor); SENSORS_ACTIVATE(sht11_sensor); leds_init();- unsigned int cycle = 0;- while (1) { printf("%8u:", cycle);- /* This part is questionable, since I don't know if the sensors are guaranteed to return ints (vs. floats or something) and I don't know what units they use. */ int temp = sht11_sensor.value(SHT11_SENSOR_TEMP);- if (temp > TARGET_TEMP_READING) { printf(" TEMP warm- "); if (!temp_led_on) { printf("toggle LED"); temp_led_on = 1; leds_toggle(TEMP_LED); } else { printf("LED is ok "); } } else { printf(" TEMP cold- "); if (temp_led_on) { printf("toggle LED"); temp_led_on = 0; leds_toggle(TEMP_LED); } else { printf("LED is ok "); } }- /* Code for humidity */ /* Code for light */- printf("\n");- /* Sleep 5 seconds */ etimer_set(&Timer, CLOCK_CONF_SECOND * 5); PROCESS_WAIT_EVENT_UNTIL(ev==PROCESS_EVENT_TIMER); etimer_reset(&Timer); ++cycle; }- PROCESS_END(); } -

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     2/5

   • Programming language C

     Top Answer

     Answered Feb 07, 2016 · 2 votes

     The arrays are passed by pointers (the way references are used in C). So when the data is modified in the body of the function, the calling function can access the modified data.

     After the function is executed all the variables must be lost and nothing must be saved in from array after function is executed.

     True, objects that have liftetimes within the lifetime of the function will be lost when the function exists. However the function's lifetime has no effect on objects that have existed before it or after it.

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     3/5

   • C Programming Language

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     4/5

   • C Programming Language Cheat Sheet

     This C Cheat Sheet provides an overview of both basic and advanced concepts of the C language. Whether you’re a beginner or an experienced programmer, this cheat sheet will help you revise and quickly go through the core principles of the C language.

     In this Cheat Sheet, we will delve into the basics of the C language, exploring its fundamental concepts that lay the groundwork for programming. We will cover topics such as variables, data types, and operators, providing you with a solid understanding of the building blocks of C programming.

     Basic Syntax

     Consider the below Hello World program:

     C

     // C Hello World program #include <stdio.h>   int main() {     printf("Hello World!");     return 0; }-

     Output

     Hello World!

     Here,

     • #include <stdio.h>: The header file inclusion to use printf() function.
     • int main(): The main() function is the entry point of any C program.
     • printf(“Hello World”): Function to print hello world.

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     5/5

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2. www.w3schools.com › c › indexC Tutorial - W3Schools

   www.w3schools.com › c › index

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   Learn C. C is a general-purpose programming language, developed in 1972, and still quite popular. C is very powerful; it has been used to develop operating systems, databases, applications, etc. Start learning C now ».

3. www.freecodecamp.org › news › what-is-the-c-programmingWhat is The C Programming Language? A Tutorial for Beginners

   www.freecodecamp.org › news › what-is-the-c-programming

   • Cached

   Jun 30, 2021 · This tutorial will give you a broad overview of basic concepts of the C programming language. We'll go over the history of the language, why and where it is used, the compilation process, and some very basic programming concepts that are common in most popular programming languages.

4. www.codecademy.com › learn › pathsLearn C | Codecademy

   www.codecademy.com › learn › paths

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   1. Welcome to the Learn C Skill Path! 2. C Basics. Get started with the C language and learn about variables and operators. 3. C Control Flow. Learn about various types of conditionals, loops, and errors in C. 4. Going Further with C. Learn about arrays, char arrays (or strings), pointers, and memory management in C. 5.

5. www.freecodecamp.org › news › the-c-programming-handbook-forThe C Programming Handbook for Beginners - freeCodeCamp.org

   www.freecodecamp.org › news › the-c-programming-handbook-for

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   Aug 29, 2023 · C is one of the oldest, most widely known, and most influential programming languages. It is used in many industries because it is a highly flexible and powerful language. Learning C is a worthwhile endeavor – no matter your starting point or aspirations – because it builds a solid foundation

6. www.codecademy.com › learn › learn-c-introductionLearn C: Introduction | Codecademy

   www.codecademy.com › learn › learn-c-introduction

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   Free. Course. Learn C: Introduction. Learn about the basics of the C programming language, and write your first C program! 4.4. 2,034 ratings. Start. 31,530 learners enrolled. Skill level. Beginner. Time to complete. <1 hour. Certificate of completion. Included with paid plans. Prerequisites. None. About this course.

7. www.learn-c.orgLearn C - Free Interactive C Tutorial

   www.learn-c.org

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   Welcome. Welcome to the learn-c.org free interactive C tutorial. Whether you are an experienced programmer or not, this website is intended for everyone who wishes to learn the C programming language. There is no need to download anything - Just click on the chapter you wish to begin from, and follow the instructions. Good luck!

8. www.gnu.org › software › gnu-c-manualThe GNU C Reference Manual

   www.gnu.org › software › gnu-c-manual

   • Cached

   This is a reference manual for the C programming language as implemented by the GNU Compiler Collection (GCC). Specifically, this manual aims to document: The 1989 ANSI C standard, commonly known as “C89” The 1999 ISO C standard, commonly known as “C99”, to the extent that C99 is implemented by GCC