Update

C++/Program 29/DecimaltoBinary.cpp

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+// number to binary number
+
+#include <iostream>
+using namespace std;
+
+// function to convert decimal to binary
+void decToBinary(int n)
+{
+    // array to store binary number
+    int binaryNum[32];
+
+    // counter for binary array
+    int i = 0;
+    while (n > 0) {
+
+        // storing remainder in binary array
+        binaryNum[i] = n % 2;
+        n = n / 2;
+        i++;
+    }
+
+    // printing binary array in reverse order
+    for (int j = i - 1; j >= 0; j--)
+        cout << binaryNum[j];
+}
+
+// Driver program to test above function
+int main()
+{
+    int n = 17;
+    decToBinary(n);
+    return 0;
+}

C++/Program 29/Readme.md

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+C++ program to convert a decimal.

C/program-83/README.md

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+## Program 83
+Program in C to represent polynomial expression in one variable using linked list.

C/program-83/polynomial.c

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+#include<stdio.h>
+#include<stdlib.h>
+
+struct poly
+{
+ int coeff;    
+ int exp;
+ struct poly *next;
+};
+
+void add(struct poly **p,int c,int e) // adding nodes for each order
+{
+ struct poly *new=*p,*temp;
+ new=(struct poly *)malloc(sizeof(struct poly));
+ new->coeff=c;
+ new->exp=e;
+ new->next=NULL;
+
+ if(*p==NULL)          // if start is null
+  *p=new;
+ else
+ {
+  struct poly *temp=*p;
+  while(temp->next!=NULL)     
+   temp=temp->next;
+  temp->next=new;
+ } 
+
+}
+
+void display(struct poly **p)    // for displaying each node that contains different order of X
+{
+struct poly*temp=*p;
+ while(temp!=NULL)
+ { 
+  printf("+%d",temp->coeff);
+  if(temp->exp!=0)
+  printf("x^%d",temp->exp);
+   temp=temp->next;
+ }
+}  
+
+int main()
+{
+  int co,ex;
+  char ch='y';
+  struct poly *start=NULL;
+  printf("Enter the polynomial from highest order to lowest\n");
+  while(ch=='y')
+  {
+     printf("Enter the coefficient of x:\n");
+     scanf("%d",&co);           
+     printf("enter the exponent of x:\n");
+     scanf("%d",&ex);
+     add(&start,co,ex);                //calling add function
+     printf("\n\tDo u want to add more (y/n)");
+     getchar();
+     scanf("%c",&ch);
+
+  }
+
+  printf("\n\tThe polynomial expression is:\t");
+  display(&start);       //final display
+  printf("\n");
+  return 0;
+}
+

C/program-83/program.c

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+/*program to calculate profit & loss in BITCOIN mining*/
+
+#include<stdio.h>
+
+int main(){
+
+   float current_btc_price, avg_cost;
+   float total_btc, profitloss;
+
+   printf("Enter Your Total Bitcoin: ");
+   scanf("%f",&total_btc);
+
+   printf("Enter Current Bitcoin Price: ");
+   scanf("%f",&current_btc_price);
+
+   printf("Your Average Bitcoin Purchase Price: ");
+   scanf("%f",&avg_cost);
+
+   //profitloss = (current_btc_price - averagecost) x total_btc 
+
+   profitloss = (current_btc_price - avg_cost) * total_btc;
+
+   if(profitloss > 0)
+ printf("Bitcoin Trading Profit is: %0.2f",profitloss);
+   else
+ printf("Bitcoin Trading Loss is: %0.2f",profitloss);
+
+   return 0;
+}

Interview Questions/Trapping Rain Water/README.md

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+Trapping Rain Water
+
+
+Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.
+
+Input: arr[]   = {3, 0, 2, 0, 4}
+Output: 7
+
+Explanation:
+We can trap "3 units" of water between 3 and 2,
+"1 unit" on top of bar 2 and "3 units" between 2 
+and 4.

Interview Questions/Trapping Rain Water/Trapping Rain Water.cpp

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+// C++ implementation of the approach
+#include<bits/stdc++.h>
+using namespace std;
+
+int maxWater(int arr[], int n)
+{
+
+	// indices to traverse the array
+	int left = 0;
+	int right = n-1;
+
+	// To store Left max and right max
+	// for two pointers left and right
+	int l_max = 0;
+	int r_max = 0;
+
+	// To store the total amount
+	// of rain water trapped
+	int result = 0;
+	while (left <= right)
+	{
+
+	// We need check for minimum of left
+	// and right max for each element
+	if(r_max <= l_max)
+	{
+
+		// Add the difference between
+		// current value and right max at index r
+		result += max(0, r_max-arr[right]);
+
+		// Update right max
+		r_max = max(r_max, arr[right]);
+
+		// Update right pointer
+		right -= 1;
+	}
+	else
+	{
+
+		// Add the difference between
+		// current value and left max at index l
+		result += max(0, l_max-arr[left]);
+
+		// Update left max
+		l_max = max(l_max, arr[left]);
+
+		// Update left pointer
+		left += 1;
+	}
+	}
+	return result;
+}
+
+// Driver code
+int main() {
+	int arr[] = {0, 1, 0, 2, 1, 0, 1, 3, 2, 1, 2, 1};
+	int n = sizeof(arr)/sizeof(arr[0]);
+	cout << maxWater(arr, n) << endl;
+	return 0;
+}
+
+

Java/Program-16/CSAOfCylinder.java

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+package com.dsa;
+
+import java.util.Scanner;
+
+public class CSAOfCylinder {
+    public static void main(String[] args) {
+        Scanner input=new Scanner(System.in);
+        System.out.println("Enter radius and height of cylinder");
+        float radius=input.nextFloat();
+        float height=input.nextFloat();
+        float CSA=2*3.14f*radius*height;
+        System.out.println("Curved surface area of cylinder is "+CSA+" square units");
+    }
+}

Java/Program-16/README.md

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+Program 16
+
+Program to find CSA of Cylinder

Java/Program-17/ReverseString.java

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+package com.dsa;
+
+import java.util.Scanner;
+
+public class ReverseString {
+    public static void main(String[] args) {
+        Scanner input=new Scanner(System.in);
+        String reversed_string="";
+        System.out.println("Enter the string");
+        String string= input.next();
+        for(int i=string.length()-1;i>=0;i--){
+            reversed_string = reversed_string + string.charAt(i);
+        }
+        System.out.println("The original string is "+string);
+        System.out.println("The reversed string is "+reversed_string);
+    }
+}

Java/Program-17/readme.md

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+Program 17 
+
+Program to reverse a given string

Java/Program-18/ElectricityBill.java

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+//A consumer consumes n watts per hour daily for one month.
+// Calculate the total energy bill of that consumer if per-unit rate is 7?
+// ( In $, £, €, INR, DHR, Riyal etc.) [Take 1 month = 30 Days].
+package com.dsa;
+
+import java.util.Scanner;
+
+public class ElectricityBill {
+    public static void main(String[] args) {
+        Scanner input=new Scanner(System.in);
+        System.out.println("Enter the watts consumed per hour");
+        int watts=input.nextInt();
+        int electricity=watts*24*30;//Total watts of electricity consumed in 30 days
+        int cost=(electricity/1000)*7;//We divide by 1000 to convert watts to kilo-watts
+        //One unit=One kilo-watt and One unit costs 7
+        System.out.println("The electricity bill is "+cost);
+    }
+}

Java/Program-18/readme.md

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+Program-18 
+
+Program to calculate electricity bill

Java/Program-19/Discount.java

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+package com.dsa;
+
+import java.util.Scanner;
+
+public class Discount {
+    public static void main(String[] args) {
+        Scanner input=new Scanner(System.in);
+        System.out.println("Enter the original price of product");
+        int original_price=input.nextInt();
+        System.out.println("Enter the discount percentage");
+        float discount=input.nextInt();
+        float discount_price=original_price*(discount/100);
+        float final_price=original_price-discount_price;
+        System.out.println("The discount price is: "+discount_price);
+        System.out.println("The final price after discount is: "+final_price);
+    }
+}

Java/Program-19/readme.md

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+Program 19
+
+Program to calculate discount

Java/Program-20/BattingAverage.java

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+package com.dsa;
+
+import java.util.Scanner;
+
+public class BattingAverage {
+    public static void main(String[] args) {
+        Scanner input=new Scanner(System.in);
+        System.out.println("Enter the number of runs scored by the batter");
+        int runs=input.nextInt();
+        System.out.println("Enter the number of times the batter got out ");
+        int out= input.nextInt();
+        int batting_avg=runs/out;
+        System.out.println("The batting average of the batter is "+batting_avg);
+    }
+}

Java/Program-20/readme.md

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+Program 20 
+
+Program to calculate batting average

Java/Readme.md

@@ -17,6 +17,13 @@
 | [Program-11](https://github.com/swaaz/basicprograms/blob/814a1e60ae23d81158d8174666f23c9b7419e15e/Java/Program-11/Program.java) | Program for compound interest
 | [Program-12](https://github.com/swaaz/basicprograms/blob/814a1e60ae23d81158d8174666f23c9b7419e15e/Java/Program-12/Program-12.java) | Print number of vowels and consonants in a string
 | [Program-13](https://github.com/swaaz/basicprograms/blob/814a1e60ae23d81158d8174666f23c9b7419e15e/Java/Program-13/Program%20Number%20to%20Word.java) | Program to convert number into words
+| [Program-14](https://github.com/swaaz/basicprograms/blob/814a1e60ae23d81158d8174666f23c9b7419e15e/Java/Program-14/Program%20Number%20to%20Word.java) | Program to convert decimal to binary
+| [Program-15](https://github.com/swaaz/basicprograms/blob/814a1e60ae23d81158d8174666f23c9b7419e15e/Java/Program-15/Program%20Number%20to%20Word.java) | Program to convert decimal number to equivalenr binary number
+| [Program-16](https://github.com/swaaz/basicprograms/blob/814a1e60ae23d81158d8174666f23c9b7419e15e/Java/Program-16/Program%20Number%20to%20Word.java) | Program to find CSA of cylinder
+| [Program-17](https://github.com/swaaz/basicprograms/blob/814a1e60ae23d81158d8174666f23c9b7419e15e/Java/Program-17/Program%20Number%20to%20Word.java) | Program to reverse a given string
+| [Program-18](https://github.com/swaaz/basicprograms/blob/814a1e60ae23d81158d8174666f23c9b7419e15e/Java/Program-18/Program%20Number%20to%20Word.java) | Program to calculate electricity bill
+| [Program-19](https://github.com/swaaz/basicprograms/blob/814a1e60ae23d81158d8174666f23c9b7419e15e/Java/Program-19/Program%20Number%20to%20Word.java) | Program to calculate discount
+| [Program-20](https://github.com/swaaz/basicprograms/blob/814a1e60ae23d81158d8174666f23c9b7419e15e/Java/Program-20/Program%20Number%20to%20Word.java) | Program to calculate batting average
 
  </div>