Covering for margin of error in an input value

I am trying to create a program that can convert a duration to morse. And i cannot figure out why the if statements in durations2morse aren't printing the relevant snippet, I wanted to cover for a margin of error between input values. The add noise function was used to add variability for testing.

const int abcLength = 19; int abcDurations[abcLength] = {420,-420,1260,-2940,1260,-420,420,-420,420,-420,420,-2940,1260,-420,420,-420,1260,-420,420}; void setup() { Serial.begin(9600); Serial.println(""); randomSeed(analogRead(0)); duration2morse(abcDurations,abcLength); } String duration2morse(int* durations, int length) { const float Variability = 0.1; int shortestDuration = 20000; addNoise(durations, length, Variability); for(int i=0; i < length; i++) { if(abs(durations[i]) < shortestDuration) { shortestDuration = durations[i]; } } for(int i=0; i < length; i++) { Serial.print(durations[i] > shortestDuration * (1 - Variability)); if(durations[i] > shortestDuration * (1 - Variability) && durations[i] < shortestDuration * (1 + Variability)) { Serial.print("."); } else if(durations[i] > shortestDuration * (3 - Variability) && durations[i] < shortestDuration * (3 + Variability)) { Serial.print("-"); } else if(abs(durations[i]) > shortestDuration * (3 - Variability) && abs(durations[i]) < shortestDuration * (3 + Variability)) { Serial.print("/"); } else if(abs(durations[i]) > shortestDuration * (7 - Variability) && abs(durations[i]) < shortestDuration * (7 + Variability)) { Serial.print(" "); } else { Serial.println("miss"); } } } void addNoise(int* array, int length, float fraction) { for(int i=0; i < length; i++) { long variability = random(fraction * 100); long plusMinus = random(0,1); if(plusMinus == 0) { array[i] = array[i] + variability ; } else if(plusMinus == 1) { array[i] = array[i] - variability; } } }