42 lines
1.4 KiB
C++
42 lines
1.4 KiB
C++
/*
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PrimeNos3: by Nick Gammon
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Maple Mini port m. ray burnette: Compiled under Arduino 1.6.0rc1
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Sketch uses 13,420 bytes (12%) of program storage space. Maximum is 108,000 bytes.
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Global variables use 2,600 bytes of dynamic memory.
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PUBLIC DOMAIN EXAMPLE
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*/
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#define BAUD 9600
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const int SHOW_EVERY = 500; // how often to echo a prime to the serial port
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int candidate;
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int found = 5; // Number we found
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int count = found - 1;
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void setup() {
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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.isConnected() && (Serial.getDTR() || Serial.getRTS())))
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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("Prime Number Generator V2");
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}
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void loop() {
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Serial.println("Prime numbers between 1 and 99999999 are:");
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Serial.println("2 \t");
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for (int i=3; i<99999999;i+=2) {
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// This loop stops either when j*j>i or when i is divisible by j.
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// The first condition means prime, the second, not prime.
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int j=3;
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for(;j*j<=i && i%j!=0; j+=2); // No loop body
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if (j*j>i) Serial.print(i);Serial.print( "\n\r");
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}
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Serial.println("\r\n");
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}
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