{"page":"\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/resources-572d6a42.css\" /\u003e\n\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/lp_boclips_stylesheets-f4d0de30.css\" media=\"all\" /\u003e\n\u003cdiv data-title='sprintf() with Arduino' data-url='/boclips/videos/62a0e4841c259e357d94ff41' data-video-url='/boclips/videos/62a0e4841c259e357d94ff41' id='bo_player_modal'\u003e\n\u003cdiv class='boclips-resource-page modal-dialog panel-container'\u003e\n\u003cdiv class='react-notifications-root'\u003e\u003c/div\u003e\n\u003cdiv class='rp-header'\u003e\n\u003cdiv class='rp-type'\u003e\n\u003ci aria-hidden='true' class='fai fa-regular fa-circle-play'\u003e\u003c/i\u003e\nVideo\n\u003c/div\u003e\n\u003ch1 class='rp-title' id='video-title'\u003e\nsprintf() with Arduino\n\u003c/h1\u003e\n\u003cdiv class='rp-actions'\u003e\n\u003cdiv class='mr-1'\u003e\n\u003ca class=\"btn btn-success\" data-posthog-event=\"Signup: LP Signup Activity\" data-posthog-location=\"body_link_boclips\" data-remote=\"true\" href=\"/subscription/new\"\u003e\u003cspan\u003e\u003cspan\u003eGet Free Access\u003c/span\u003e\u003cspan class=\"\"\u003e for 10 Days\u003c/span\u003e\u003cspan\u003e!\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-body'\u003e\n\u003cdiv class='rp-info'\u003e\n\u003cdiv aria-label='Hide resource details' class='rp-hide-info' role='button' tabindex='0'\u003e\u0026times;\u003c/div\u003e\n\u003ci aria-label='Expand resource details' class='rp-expand-info fai fa-solid fa-up-right-and-down-left-from-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003ci aria-label='Compress resource details' class='rp-compress-info fai fa-solid fa-down-left-and-up-right-to-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003cdiv class='rp-rating'\u003e\n\u003cspan class='resource-pool'\u003e\n\u003cspan class='pool-label'\u003ePublisher:\u003c/span\u003e\n\u003cspan class='pool-name'\u003e\n\u003cspan class='text'\u003e\u003ca data-publisher-id=\"30358947\" href=\"/search?publisher_ids%5B%5D=30358947\"\u003eProgramming Electronics Academy\u003c/a\u003e\u003c/span\u003e\n\u003c/span\u003e\n\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-description'\u003e\n\u003cspan class='short-description'\u003eIf so, you’re in the right place.  In this lesson you’ll learn exactly how to use sprintf().JUST USING SERIAL.PRINT()Let’s say you want to print this line of text to the serial monitor:“The 3 burritos are 147.7 degrees F”Where the number...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eIf so, you’re in the right place.  In this lesson you’ll learn exactly how to use sprintf().\u003cbr/\u003e\u003cbr/\u003eJUST USING SERIAL.PRINT()\u003cbr/\u003eLet’s say you want to print this line of text to the serial monitor:\u003cbr/\u003e\u003cbr/\u003e“The 3 burritos are 147.7 degrees F”\u003cbr/\u003e\u003cbr/\u003eWhere the number of burritos and the temperature value are both variables. Using Serial.print() would take 5 lines of code to print out just this single line of text.\u003cbr/\u003e\u003cbr/\u003e  Serial.print(\"The \");\u003cbr/\u003e  Serial.print(numBurritos);\u003cbr/\u003e  Serial.print(\" burritos are \");\u003cbr/\u003e  Serial.print(tempStr);\u003cbr/\u003e  Serial.println(\" degrees F\");\u003cbr/\u003eIn fact, for every variable you add to the output, you add two more serial prints in the code. What if you wanted to print a line with 4 variables inserted into a string like this:\u003cbr/\u003e\u003cbr/\u003e“The 3 burritos are 147.7 degrees F, weigh 14oz, and were finished 3 minutes ago.”\u003cbr/\u003e\u003cbr/\u003eIt would take 9 lines of code!\u003cbr/\u003e\u003cbr/\u003eSPRINTF() TO THE RESCUE\u003cbr/\u003eThis is where sprintf() comes in handy. We can print out as many variables into our string as we want, and the amount of code required stays at 3 lines.\u003cbr/\u003e\u003cbr/\u003eHere the three lines of code you’ll need:\u003cbr/\u003e\u003cbr/\u003e  char buffer[40];\u003cbr/\u003e  sprintf(buffer, \"The %d burritos are %s degrees F\", numBurritos, tempStr);\u003cbr/\u003e  Serial.println(buffer);\u003cbr/\u003eFirst you need a character array to save the output string into.\u003cbr/\u003eThen you need the sprintf() function, which will combine our text and variables into a string.\u003cbr/\u003eFinally, you use Serial.print() to display the formatted string.\u003cbr/\u003eLet’s take a closer look at each line of code.\u003cbr/\u003e\u003cbr/\u003e  char buffer[40];\u003cbr/\u003eThe character array needs to be as large, or larger than the final output string.\u003cbr/\u003eSo count the characters you plan to store in that string, and make sure the buffer is at least that large.\u003cbr/\u003e\u003cbr/\u003eThe next line of code is the actual sprintf() function. sprintf() stands for “string print format(ted)”.\u003cbr/\u003e\u003cbr/\u003e  sprintf(buffer, \"The %d burritos are %s degrees F\", numBurritos, tempStr);\u003cbr/\u003esprintf() takes a minimum of 2 arguments. The first argument is where you plan to store the string that sprintf() will be making for you. This is where you use the character buffer that you created on the previous line.\u003cbr/\u003e\u003cbr/\u003eshow buffer argument in sprintf()\u003cbr/\u003eThe next argument is the string you want to create, filled in with format specifiers where you want to insert your variables. The format specifier is the % sign. The letter following the format specifier is called the format character, and it tells sprintf() what datatype will be used for that variable.\u003cbr/\u003e\u003cbr/\u003eshow the second string argument for sprintf(), with format specifiers labeled\u003cbr/\u003e  \"The 3 burritos are 147.7 degrees F\"\u003cbr/\u003eIn this example we have 2 format specifiers (%) – this means we want 2 variables inserted into the output string. The character specifiers are a little weird at first. 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