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

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     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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   • 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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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-cWhat is The C Programming Language? A Tutorial for Beginners

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

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   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 › 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. 2,059 ratings. Start. 31,940 learners enrolled. Skill level. Beginner. Time to complete. <1 hour. Certificate of completion. Included with paid plans. Prerequisites. None. About this course.

5. 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.

6. www.freecodecamp.org › news › the-c-programmingThe C Programming Handbook for Beginners - freeCodeCamp.org

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

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   Aug 29, 2023 · What Is the C Programming Language? C is a general-purpose and procedural programming language. A procedural language is a type of programming language that follows a step-by-step approach to solving a problem.

7. www.programiz.com › c-programming › guideC Programming

   www.programiz.com › c-programming › guide

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   C is a powerful general-purpose programming language. It can be used for a wide range of applications from Operating systems like Windows and iOS to software that is used to create 3D movies. To get started with C programming, visit our C Tutorials. Features of C Programming. A procedural language. C is a procedural language.

8. www.gnu.org › software › c-intro-and-refGNU C Language Introduction and Reference Manual

   www.gnu.org › software › c-intro-and-ref

   GNU C Language Introduction and Reference Manual Edition 0.0 Richard Stallman and Trevis Rothwell plus Nelson Beebe on floating point