Need help - Newbie with high school project

just started , struggling programming. trying combine force sensitive resistor code piezo squeezing force sensitive resistor turn piezo off.  compiles doesn't work on board?  trying finish high school project , appreciate advice.
thanks!

/* melody
 * (cleft) 2005 d. cuartielles k3
 *
 * example uses piezo speaker play melodies.  sends
 * square wave of appropriate frequency piezo, generating
 * corresponding tone.
 *
 * calculation of tones made following mathematical
 * operation:
 *
 *       timehigh = period / 2 = 1 / (2 * tonefrequency)
 *
 * different tones described in table:
 *
 * note   frequency   period  timehigh
 * c          261 hz          3830  1915 
 * d          294 hz          3400  1700 
 * e          329 hz          3038  1519 
 * f          349 hz          2864  1432 
 * g          392 hz          2550  1275 
 * a          440 hz          2272  1136 
 * b          493 hz          2028  1014 
 * c          523 hz          1912  956
 *
 * http://www.arduino.cc/en/tutorial/melody
 */
 
int sensepin = 2;
int speakerpin = 9;

int length = 15; // number of notes
char notes[] = "ccggaagffeeddc "; // space represents rest
int beats[] = { 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 4 };
int tempo = 300;

void playtone(int tone, int duration) {
  (long = 0; < duration * 1000l; += tone * 2) {
    digitalwrite(speakerpin, high);
    delaymicroseconds(tone);
    digitalwrite(speakerpin, low);
    delaymicroseconds(tone);
  }
}

void playnote(char note, int duration) {
  char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'c' };
  int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 };
 
  // play tone corresponding note name
  (int = 0; < 8; i++) {
    if (names == note) {
      playtone(tones, duration);
    }
  }
}

void setup() {
  serial.begin(9600);
  pinmode(speakerpin, output);
}

void loop() {
  int value = analogread(sensepin) /4;
  analogwrite(speakerpin, value);
  (int = 0; < length; i++) {
    if (notes == ' ') {
      delay(beats * tempo); // rest
    } else {
      playnote(notes, beats * tempo);
    }
   
    // pause between notes
    delay(tempo / 2);
  }
}

please use code tags [i] corrupts listing.

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