doSomething

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src/main/java/Question1.java

     //returns random integers between 7(s+1) and 1
     public static void doSomething0()
     {
-        int s = 6;
+        int s = 6; // s is variable of integer type and value initializes as 6
 
-        int r = (int) (Math.random() * s) + 1;
+        int r = (int) (Math.random() * s) + 1; // r = random integers between 7(s+1) and 1
 
-        System.out.println(r);
+        System.out.println(r); // print the r value
     }
 
     public static void doSomething1(int n)
     {
         int foo = 1;
 
-        while (foo <= n / 2) {
-            foo *= 2;
+        while (foo <= n / 2) { // first lets take n value as 5 , 1 <=5/2
+            foo *= 2; // now foo is 4
         }
 
-        while (foo > 0) {
+        while (foo > 0) { //4>0 (condition true)
 
-            if (n < foo) {
+            if (n < foo) { //5<4 (condition false)
                 System.out.print(0);
             } else {
-                System.out.print(1);
-                n -= foo;
+                System.out.print(1); // prints 1
+                n -= foo; // n=1
             }
 
-            foo /= 2;
+            foo /= 2; // foo value 0 and 1
         }
 
-        System.out.println();
+        System.out.println(); // prints 0 and 1
     }
     // 1)n=4,i=0,p=1 , repeated while loop upto i=4 and printed the values of i and p
     // 2)n=12,i=0,p=1, repeated while loop upto i=12 and printed the values of i and p
         System.out.println(t);
     }
 
-    public static void doSomething4(double x) {
-        x = x % (2 * Math.PI);
+    public static void doSomething4(double x) { ////let us take x =5.2
+        x = x % (2 * Math.PI); // x=5.2%(2*3.145)=0.32672563
 
         double term = 1.0;
         double sum  = 0.0;
 
-        for (int i = 1; term != 0.0; i++) {
-            term *= (x / i);
-            if (i % 4 == 1) sum += term;
-            if (i % 4 == 3) sum -= term;
+        for (int i = 1; term != 0.0; i++) { //i is 1 and term is not equal to 0  and  increment the value of i
+            term *= (x / i); //term=0.32672563;0.16335
+            if (i % 4 == 1) sum += term; // i=0.04
+            if (i % 4 == 3) sum -= term; // i=0.04
         }
         System.out.printf("%.4f\t%.8f\n", x, sum);
     }
         while (d < n) {
             int value = getInt(n);
             k++;
-            if (!a[value]) {
-                d++;
+            if (!a[value]) { // if a[value] is false
+                d++; // increment the value of d
                 a[value] = true;
             }
         }