Added files from first programming course at OSU

OSU Coursework/CS 161 - Intro to Programming I/Labs/Lab 4/lab4_2.c

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+/*
+ * Original Author: Corwin A. Perren (perrenc)
+ * File: lab4_2.c
+ * Created: 2012 February 8, 16:58 by perrenc
+ * Last Modified: 2012 February 8, 23:09 by perrenc
+ *
+ * Asks the users for a number between 1 and 20 and prints up to that number from one
+ * and down to one from that number.
+ * It errors if the value is not within this range.
+ */
+ 
+#include <stdio.h>
+
+int main(int argc, char **argv) {
+
+	int userinput; //Variable for user input
+	int loop; //Used for looping
+
+// Clears the screen and asks the user to input an integere between one and twenty
+	system("clear");
+	printf("Please enter an integer between 1 and 20: ");
+	scanf("%d", &userinput);
+
+// Quits the program if an incorrect value has been entered
+	if((1 > userinput) | (userinput > 20)){
+		printf("You have entered an incorrect value, closing program...\n");
+		return(-1);
+	}
+
+//Prints up from one to the user entered value
+	for(loop = 1 ; (loop <= userinput) ; ++loop){
+		printf("%d ", loop);
+	}
+//Prints newline
+	printf("\n");
+
+//Prints down to one from the user entered number
+	for(loop = userinput ; ((loop <= userinput) & (loop != 0)) ; loop--){
+		printf("%d ", loop);
+	}
+//Prints a newline	
+	printf("\n");
+}