add 1-3

pset7/1-fun.c

@@ -0,0 +1,26 @@
+// #include <stdio.h>
+// 
+// // Function prototypes
+// int fun(int input);
+// 
+// int main(void)
+// {
+// 	// Initialize variables
+// 	int x;
+// 	scanf("%d", &x);
+// 
+// 	printf("%d\n", fun(x));
+// 	return 0;
+// }
+
+int fun(int input) {
+	if (input > 100) {
+		return input * input - 24;
+	} else if (input > 10) {
+		return input * 3 - 11;
+	} else if (input >= 1) {
+		return input * 2 - 1;
+	} else {
+		return input;
+	}
+}

pset7/2-getDays.c

@@ -0,0 +1,30 @@
+// #include <stdio.h>
+// 
+// int getDays(int year, int month);
+// 
+// int main() {
+//   int year, month;
+// 
+//   scanf("%d%d", &year, &month);
+//   printf("There are %d days in month %d year %d.", getDays(year, month), month,
+//          year);
+// 
+//   return 0;
+// }
+
+int getDays(int year, int month) {
+  if (month == 2) {
+    if (year % 4 == 0 && year % 100 != 0) {
+      return 29;
+    } else if (year % 100 == 0 && year % 400 == 0) {
+      return 29;
+    } else {
+      return 28;
+    }
+  } else if (month == 1 || month == 3 || month == 5 || month == 7 ||
+             month == 8 || month == 10 || month == 12) {
+    return 31;
+  } else {
+    return 30;
+  }
+}

pset7/3-getDigit.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int getDigit(long long n);
+
+int main() {
+  long long n;
+  int len;
+
+  scanf("%lld", &n);
+  len = getDigit(n);
+  if (len > 1)
+    printf("The integer %lld has %d digits.\n", n, len);
+  else
+    printf("The integer %lld has %d digit.\n", n, 1);
+  return 0;
+}