85 lines
2.1 KiB
C++
85 lines
2.1 KiB
C++
/*
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PRINT_FLOAT - Arduino 1.6.0rc1
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Sketch uses 15,164 bytes (14%) of program storage space. Maximum is 108,000 bytes.
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Global variables use 2,592 bytes of dynamic memory.
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Adapted to Maple Mini by m. ray burnette
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Illustrates how to display floats in the range of -999.999 to 999.999 with a specified
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number of digits after the decimal point.
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copyright, Peter H Anderson, Baltimore, MD, Nov, '07
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PUBLIC DOMAIN EXAMPLE
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*/
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#define BAUD 9600
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void setup() // run once, when the sketch starts
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{
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// initialize the digital pin as an output.
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pinMode(33, OUTPUT);
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Serial.begin(BAUD); // BAUD has no effect on USB serial: placeholder for physical UART
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// wait for serial monitor to be connected.
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while (!Serial)
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{
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digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
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delay(100); // fast blink
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}
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Serial.println("Print Float Format");
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}
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void loop()
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{
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while(1)
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{
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print_float(0.6, 2); // illustrate various test cases
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Serial.println();
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print_float(1.2, 1);
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Serial.println();
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print_float(10.27, 2);
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Serial.println();
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print_float(10.345, 3);
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Serial.println();
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print_float(107.345, 3);
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Serial.println();
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delay(1000);
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print_float(-0.6, 2);
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Serial.println();
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print_float(-1.2, 1);
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Serial.println();
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print_float(-10.27, 2);
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Serial.println();
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print_float(-10.345, 3);
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Serial.println();
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print_float(-107.345, 3);
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Serial.println();
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delay(1000);
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}
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}
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void print_float(float f, int num_digits)
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{
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int f_int;
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int pows_of_ten[4] = {1, 10, 100, 1000};
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int multiplier, whole, fract, d, n;
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multiplier = pows_of_ten[num_digits];
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if (f < 0.0)
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{
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f = -f;
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Serial.print("-");
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}
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whole = (int) f;
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fract = (int) (multiplier * (f - (float)whole));
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Serial.print(whole);
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Serial.print(".");
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for (n=num_digits-1; n>=0; n--) // print each digit with no leading zero suppression
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{
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d = fract / pows_of_ten[n];
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Serial.print(d);
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fract = fract % pows_of_ten[n];
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}
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}
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