cpp:io: Added unlimited input example

cpp/io/unknown_number_of_input.cpp

@@ -0,0 +1,34 @@
+#include<iostream>
+
+//use cout and cin to print some stuff and get input
+
+int main(){
+	/*
+	 * All of these "<<" are going into std::cout
+	 * the "endl" forces a flush
+	 * note that is "l" as in "line" not "1" as in "one"
+	 */
+	std::cout << "Enter numbers, press <ctrl-d> to finish: "<< std::endl;
+
+	int input;
+	int sum;
+	input = 0;
+	sum = 0;
+	
+	/*
+	 * For some reason this is deliminated by spaces
+	 * if only one number is given, it will wait for another input
+	 */
+	while (std::cin >> input){
+		sum += input;
+	}
+	
+
+	/*
+	 * formated for legability
+	 * we are putting all those things into std::cout in the order they appear
+	 */
+	std::cout << "The sum is " 
+						<< sum 
+						<< std::endl;
+}