added readme.md

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.