4 files changed, 120 insertions, 0 deletions
diff --git a/programs/add-2-nums-fns.c b/programs/add-2-nums-fns.c
new file mode 100644
index 0000000..82a5bd9
--- /dev/null
+++ b/programs/add-2-nums-fns.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+
+int add(int a, int b)
+{
+	return a + b;
+}
+
+int main(void)
+{
+	int a, b, sum;
+	printf("Enter first number: ");
+	scanf("%d", &a);
+	printf("Enter second number: ");
+	scanf("%d", &b);
+	sum = add(a, b);
+	printf("The sum of %d and %d is %d.\n", a, b, sum);
+	return 0;
+}
+
+/*
+Output:
+
+Set 1:
+Enter first number: 10
+Enter second number: 20
+The sum of 10 and 20 is 30.
+
+Set 2:
+Enter first number: 1 
+Enter second number: 2
+The sum of 1 and 2 is 3.
+
+Set 3:
+Enter first number: 33
+Enter second number: 44
+The sum of 33 and 44 is 77.
+
+*/
+
diff --git a/programs/avg-fn.c b/programs/avg-fn.c
new file mode 100644
index 0000000..da8ec19
--- /dev/null
+++ b/programs/avg-fn.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+
+float average(float a, float b, float c)
+{
+	return (a + b + c) / 3;
+}
+
+int main(void)
+{
+	float a, b, c;
+	printf("Average of three numbers\n\n");
+	printf("Enter three numbers: ");
+	scanf("%f%f%f", &a, &b, &c);
+	printf("The average is %f\n", average(a, b, c));
+	return 0;
+}
+
+/*
+Output:
+Set 1:
+Average of three numbers
+
+Enter three numbers: 1 2 3
+The average is 2.000000
+
+Set 2:
+Average of three numbers
+
+Enter three numbers: 1.5 2.3 7.9
+The average is 3.900000
+
+Set 3:
+Average of three numbers
+
+Enter three numbers: 123 45.6 7.89
+The average is 58.829999
+
+*/
+
diff --git a/programs/leap-year-fn.c b/programs/leap-year-fn.c
new file mode 100644
index 0000000..43842a9
--- /dev/null
+++ b/programs/leap-year-fn.c
@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <stdbool.h>
+
+bool is_leap_year(int y)
+{
+	return y % 400 == 0 || (y % 100 != 0 && y % 4 == 0);
+}
+
+int main(void)
+{
+	int year;
+	printf("To check whether a given year is leap year or not\n\n");
+	printf("Enter a year: ");
+	scanf("%d", &year);
+	if (year <= 1200 || year >= 9999) {
+		printf("Invalid year.\n");
+		return 0;
+	}
+	printf("%d is%s a leap year.\n", year, is_leap_year(year) ? "" : " not");
+	return 0;
+}
+
+/*
+Output:
+Set 1:
+
+
+Set 2:
+
+Set 3:
+
+Set 4:
+
+*/
+
diff --git a/programs/pre-post.c b/programs/pre-post.c
new file mode 100644
index 0000000..7eab3a2
--- /dev/null
+++ b/programs/pre-post.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main(int argc, char **argv)
+{
+	printf("%d%d%d", argc++, argc, ++argc);
+}
+