update

C++/Program 22/adding_two_string.cpp

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+/*
+Program : To add 2 string
+
+this Program is Contributed by Abhishek Jaiswal
+*/
+
+#include <iostream> 
+using namespace std; 
+
+int Len(string &str1, string &str2) 
+{ 
+    int len1 = str1.size(); 
+    int len2 = str2.size(); 
+    if (len1 < len2) 
+    { 
+        for (int i = 0 ; i < len2 - len1 ; i++) 
+            str1 = '0' + str1; 
+        return len2; 
+    } 
+    else if (len1 > len2) 
+    { 
+        for (int i = 0 ; i < len1 - len2 ; i++) 
+            str2 = '0' + str2; 
+    } 
+    return len1; 
+}
+
+string add( string a, string b ) 
+{ 
+    string result; 
+    int len = Len(a, b); 
+
+    int carry = 0;
+    for (int i = len-1 ; i >= 0 ; i--) 
+    { 
+        int aBit = a.at(i) - '0'; 
+        int bBit = b.at(i) - '0'; 
+        int sum = (aBit ^ bBit ^ carry)+'0'; 
+
+        result = (char)sum + result; 
+        carry = (aBit & bBit) | (bBit & carry) | (aBit & carry); 
+    } 
+
+    if (carry) 
+        result = '1' + result; 
+
+    return result; 
+} 
+
+int main() 
+{ 
+    string str1,str2;
+    cout<<"Enter the string 1 :";
+    cin>>str1;
+    cout<<"Enter the string 2 :";
+    cin>>str2;
+    cout << "Sum is " << add(str1, str2); 
+    return 0; 
+} 

C++/Program 22/readme.md

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+Program : To add Two Binary Number 
+Input : Two Number consitising of 0 and 1
+Output : Number Constisting of 0 and 1

C++/Program 23/readme.md

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+Program :To find the sum of square of binomial coefficient
+Input : Integer
+Output : Integer
+

C++/Program 23/sum_of_square_of_binomial_coefficient.cpp

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+/*
+Program :To find the sum of square of  
+binomial coefficient. 
+
+This Program is contributed by Abhishek Jaiswal
+*/
+#include <bits/stdc++.h>
+using namespace std;
+
+int factorial(int begin, int end)
+{
+    int num = 1;
+    for (int i = begin; i <= end; i++)
+        num *= i;
+
+    return num;
+}
+
+int square(int n)
+{
+    return factorial(n + 1, 2 * n) / factorial(1, n);
+}
+
+int main()
+{
+    int n;
+    cout << "Enter the number :";
+    cin >> n;
+    cout << "The Sum of Square is " << square(n) << endl;
+    return 0;
+}
+

C++/Program-20/README.md

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+## To find the square root of a number upto "p" no of places
+
+
+Here we take input of that number "num" and the number "p"

C++/Program-20/program.cpp

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+#include<bits/stdc++.h>
+using namespace std;
+
+
+float square_root(int num,int p) {
+	int s=0;
+	int e=num;
+	float ans=-1;
+	while(s<=e) {
+		int mid=s+e>>1; //  (s+e)/2
+		if(mid*mid==num) {
+			return mid;
+		}
+		else if(mid*mid>=num) {
+			e=mid-1;
+
+		}
+		else {    //as 7*7 is vey close to 50
+			s=mid+1;
+			ans=mid;
+		}
+	}
+
+	//for floating part
+	//brute force
+	float inc=0.1;
+	for(int i=1;i<=p;i++) {
+		while(ans*ans<=num) {
+			ans=ans+inc;
+		}
+		//when this blows up 
+		ans=ans-inc;//comeback 1 step
+		inc/=10;
+	}
+	return ans;
+
+}
+
+int main() {
+	int num,p;
+	cin>>num;///the input number of which you want to find the square root
+	cin>>p;//find the square root upto "p" no of places
+	cout<<square_root(num,p)<<endl;
+	return 0;
+ }

C++/Program-21/README.md

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+# Last digit of sum of partial Fibonacci Series
+
+## Problem statement:
+Given two non-negative integers m and n, where m <= n, find the last digit of the sum *Fm + Fm+1 + .... + Fn*
+
+### Input:
+Two non negative intergers m and n, such that m <= n.
+
+### Output: 
+The last digit of the sum of Fibonacci series starting from *Fm* to *Fn*.
+
+### Example:
+
+*Input:*
+```
+3 7
+```
+*Output:*
+```
+1
+```
+*Explanation:*
+```
+𝐹3 + 𝐹4 + 𝐹5 + 𝐹6 + 𝐹7 = 2 + 3 + 5 + 8 + 13 = 31
+Last digit of 31 = 1
+```

C++/Program-21/program.cpp

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+/* Compute the last digit of the sum of partial Fibonacci series. (Given two non-negative integers m and n, where m <= n, find the last digit of the sum Fm + Fm+1 + .... + Fn) */
+
+#include<bits/stdc++.h>
+using namespace std;
+typedef long long int ll;
+
+void solve()
+{
+   ll n = 0, m = 0;
+   int b[60] = {0, 1, 2, 4, 7, 2, 0, 3, 4, 8, 3, 2, 6, 9, 6, 6, 3, 0, 4, 5, 0, 6, 7, 4, 2, 7, 0, 8, 9, 8, 8, 7, 6, 4, 1, 6, 8, 5, 4, 0, 5, 6, 2, 9, 2, 2, 5, 8, 4, 3, 8, 2, 1, 4, 6, 1, 8, 0, 9, 0};
+   int i = 0, j = 0, sum = 0;
+
+   cin >> n >> m;
+
+   i = (n-1) % 60;
+   j = m % 60;
+
+   if(b[j] >= b[i])
+   {
+      cout << b[j] - b[i] << "\n";
+   }
+   else
+   {
+      b[j] += 10;
+      cout << b[j] - b[i] << "\n";
+   }
+}
+
+int main()
+{
+   //for fast input output
+   ios_base::sync_with_stdio(false);cin.tie(NULL);
+
+   solve();
+
+   return 0;
+}

C++/Program18/PrintSeries.cpp

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+#include<iostream>
+
+using namespace std;
+
+void printSeries(int num1,int num2){
+    int count = 1;
+    int i = 1;
+    while(count < num1+1){
+        int num = (3 * i) + 2;
+        i++;
+
+        if((num % num2) == 0){
+
+        }else{
+            cout<<num<<endl;
+            count++;
+        }
+    }
+}
+
+int main()
+{
+    int num1,num2;
+    cin>>num1>>num2;
+    printSeries(num1,num2);
+    return 0;
+}

C++/Program18/Readme.md

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+## Problem
+
+```bash
+Write a function which prints first num1 terms of the series 3n+2 which are not multiples of num2. 
+```
+
+## Take Input
+```bash
+Number 1(num1)
+Number 2(num2) 
+0 < num1 < 100 & 0 < num2 < 100  
+```
+
+## Sample Input
+
+```bash 
+num1 = 10;
+num2 = 4;
+```
+## Sample Output
+
+```bash
+5
+11
+14
+17
+23
+26
+29
+35
+38
+41
+```

C++/README.md

@@ -15,3 +15,4 @@
 | Program-10 | Program to find the missing number in  a Sorted Array.
 | Program-15 | Program to find modular exponentiation.
 
+| Program-19| To check whether a number is in palindrome or not

C++/program-19/Read me.md

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+# To check whether a number is in palindrome or not

C++/program-19/palindrome.cpp

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+#include <iostream>
+using namespace std;
+int main()
+{
+    int num, temp, digit, rev = 0;
+
+    cout << "Enter a positive number: ";
+    cin >> num;
+	temp = num; 
+	while (num != 0){
+		digit = num % 10;
+    	rev = (rev * 10) + digit;
+    	num = num / 10;		
+	}
+	cout << "The reverse of the number is: " << rev << endl;
+	if (temp == rev){
+		cout<<"The number is a palindrome.";
+	}
+    else{
+    	cout << "The number is not a palindrome.";
+    }
+	return 0;
+}

C/README.md

@@ -71,3 +71,4 @@
 | Program-67 | Program to calulate all the prime between the range of numbers includes the numbers which is provided. |
 | Program-68 | Program to accept 0s and 1s as input and print if it consists 3 consecutive 0s |
 | Program-69 | Program to find strong number |
+| Program-70 | Program to make a simple calculator |

C/program-70/README.md

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+Program 70
+
+C program to make simple calculator

C/program-70/program70.c

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+#include<stdio.h>
+  int main()
+  {  
+   char op;
+   float number1,number2,result;
+   for(int i=0; i<5;i++)
+    {
+    printf("\nEnter\n + for Addition \n - for Subtraction \n * for Multiplication \n / for Division"); 
+    printf("\nEnter the operation you want to perform\n");
+    scanf("%s",&op);
+    printf("Enter two numbers\n");
+    scanf("%f %f",&number1,&number2); 
+    switch(op)
+    {
+        case'+':result=number1+number2;
+                printf("Sum is %f\n",result);
+                break;
+        case'-':result=number1-number2;
+                printf("Difference is %f\n",result);
+                break;
+        case'*':result=number1*number2;
+                printf("Product is %f\n",result);
+                break;
+        case'/':if(number2==0)
+                {
+                printf("Division not possible\n");
+                }
+                else
+                {
+                result=number1/number2;
+                printf("Quotient is %f\n",result);
+                }
+                break;
+        default:printf("Enter proper input\n");
+    }
+    }
+    return 0;
+ }

Dart/Program1/README.md

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+Q1. Write a program to check given number is even or odd.
+
+Ask the number from user in variable "number"

Dart/Program1/checkevenodd.dart

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+import 'dart:io';
+
+void main() {
+  int number;
+
+  print("Enter a number : ");
+  number = int.parse(stdin.readLineSync());
+
+  if (number.isEven) {
+    print("$number is an even number");
+  } else if (number.isOdd) {
+    print("$number is an odd number");
+  }
+}

Python/Program 30/README.md

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+Program 30
+
+Program to make a simple calculator