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21 changes: 12 additions & 9 deletions calculator/Calculator.java
Original file line number Diff line number Diff line change
@@ -1,15 +1,18 @@
class Calculator{
class Calculator {

public int addition(int num1,int num2){
return num1+num2;
public int addition(int num1, int num2) {
return num1 + num2;
}

public int substraction(int num1,int num2){
return num1-num2;
public int subtraction(int num1, int num2) {
return num1 - num2;
}

public int multiplication(int num1,int num2){
return num1*num2;

public int multiplication(int num1, int num2) {
return num1 * num2;
}

}
public int changeSign(int num) {
return -num;
}
}