added weekly exercises of isp-ws25

c/isp-ws25/weeklies/week02/w02ex04.c

@@ -0,0 +1,58 @@
+#include <stdio.h>
+
+/*
+- find mistakes in the given source code
+
+[x] ask for lower limit
+[x] ask for upper limit
+[x] calculate sum of all even numbers contained
+[x] calculate average of all even numbers contained
+[x] include lower, exclude upper
+[x] error if not lower < upper: "Upper limit must be higher than lower limit\n"
+[x] terminate on error
+*/
+
+int main()
+{
+	//int lower_limit = 0
+	int lower_limit = 0;
+	int upper_limit = 0;
+
+	printf("Enter lower limit: ");
+	scanf("%d", &lower_limit);
+
+	printf("Enter upper limit: ");
+	//scanf("%d", upper_limit);
+	scanf("%d", &upper_limit);
+
+	//if (lower_limit <= upper_limit)
+	if (upper_limit <= lower_limit)
+	{
+		printf("Upper limit must be higher than lower limit\n");
+		return 1;
+	}
+
+	//int sum;
+	int sum = 0;
+	//int count;
+	int count = 0;
+
+	// Loop to find the sum of even numbers
+	for (int i = lower_limit; i < upper_limit; i++)
+	{
+		//if ((i % 2) = 0)
+		if ((i % 2) == 0)
+		{
+			sum = sum + i;
+			count++;
+		}
+	}
+
+	// Calculate the average of the even numbers
+	//float average = count / sum;
+	float average = sum / count;
+	printf("Sum of even numbers: %d\n", sum);
+	printf("Average of even numbers: %f\n", average);
+
+	return 0;
+}