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Fixed Dividing by Zero errors #251

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Fixed Dividing by Zero errors #251

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26 changes: 26 additions & 0 deletions src/com/jwetherell/algorithms/mathematics/Division.java
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,11 @@
public class Division {

public static final long division(int a, int b) {

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The method will throw an exception by ensuring the value of b before the result "long" is calculated avoiding unexpected results.

if (b == 0) {
throw new IllegalArgumentException("Divisor cannot be zero.");
}

long result = ((long) a) / ((long) b);
return result;
}
Expand All @@ -11,6 +16,10 @@ public static final long divisionUsingLoop(int a, int b) {
int absA = Math.abs(a);
int absB = Math.abs(b);

if (b == 0) {
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The method will throw an exception by ensuring the value of b before the result "long" is calculated avoiding unexpected results.

throw new IllegalArgumentException("Divisor cannot be zero.");
}

long temp = absA;
long result = 0;
while (temp >= 0) {
Expand All @@ -25,6 +34,10 @@ public static final long divisionUsingRecursion(int a, int b) {
int absA = Math.abs(a);
int absB = Math.abs(b);

if (b == 0) {
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The method will throw an exception by ensuring the value of b before the result "long" is calculated avoiding unexpected results.

throw new IllegalArgumentException("Divisor cannot be zero.");
}

long result = 1;
int diff = absA - absB;
if (diff > 0 && diff <= 1) {
Expand All @@ -41,6 +54,10 @@ public static final long divisionUsingMultiplication(int a, int b) {
int absA = Math.abs(a);
int absB = Math.abs(b);

if (b == 0) {
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The method will throw an exception by ensuring the value of b before the result "long" is calculated avoiding unexpected results.

throw new IllegalArgumentException("Divisor cannot be zero.");
}

int temp = absB;
int counter = 0;
while (temp <= absA) {
Expand All @@ -59,6 +76,10 @@ public static final long divisionUsingShift(int a, int b) {
int absB = Math.abs(b);
int tempA, tempB, counter;

if (b == 0) {
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The method will throw an exception by ensuring the value of b before the result "long" is calculated avoiding unexpected results.

throw new IllegalArgumentException("Divisor cannot be zero.");
}

long result = 0L;
while (absA >= absB) {
tempA = absA >> 1; // Right shift "a"
Expand All @@ -78,6 +99,11 @@ public static final long divisionUsingShift(int a, int b) {
public static final long divisionUsingLogs(int a, int b) {
long absA = Math.abs(a);
long absB = Math.abs(b);

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The method will throw an exception by ensuring the value of b before the result "long" is calculated avoiding unexpected results.

if (b == 0) {
throw new IllegalArgumentException("Divisor cannot be zero.");
}

double logBase10A = Math.log10(absA);
double logBase10B = Math.log10(absB);
double powOf10 = Math.pow(10, (logBase10A - logBase10B));
Expand Down