Add new file

5-10

+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    int sc=0;
+	scanf("%d",&sc);
+	int t=sc/10;
+	switch(t)
+	{
+		case 10:case 9:
+	    printf("Letter grade: A");
+		break;
+		
+		case 8:
+		printf("Letter grade: B");
+		break;
+		
+		case 7:
+		printf("Letter grade: C");
+		break;
+		
+		case 6:
+		printf("Letter grade: D");
+		break;
+		
+		case 0 ... 5:
+		printf("Letter grade: F");
+		break;
+		
+		default:
+		printf("Error, grade must be between 0 and 100.");
+		break;
+			
+	 } 
+    return 0;
+}
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