10 | 19- 20 | sharafat

solutions/sharafat/10/18.c

@@ -1,8 +1,22 @@
 #include <stdio.h>
 
+char *month_name(int m)
+{
+    char *months[] = {
+        "January", "February", "March", "April", "May", "June", "July", "August",
+        "September", "October", "November", "December"};
 
+    return months[m - 1];
+}
 
 int main()
 {
+    int m;
+
+    printf("Enter month number: ");
+    scanf("%d", &m);
+
+    printf("Month name: %s\n", month_name(m));
 
+    return 0;
 }

solutions/sharafat/10/19.c

@@ -0,0 +1,28 @@
+#include <stdio.h>
+
+int leap(int year)
+{
+    if (year % 400 == 0)
+        return 1;
+    else if (year % 100 == 0)
+        return 0;
+    else if (year % 4 == 0)
+        return 1;
+    else
+        return 0;
+}
+
+int main()
+{
+    int year;
+
+    printf("Enter year: ");
+    scanf("%d", &year);
+
+    if (leap(year))
+        printf("%d is a leap year.\n", year);
+    else
+        printf("%d is not a leap year.\n", year);
+
+    return 0;
+}

solutions/sharafat/10/20.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <math.h>
+
+double round2(double x)
+{
+    return round(x * 100) / 100;
+}
+
+int main()
+{
+    double x;
+
+    printf("Enter a floating point value: ");
+    scanf("%lf", &x);
+
+    printf("Rounded value: %.2lf\n", round2(x));
+
+    return 0;
+}