From ce00d57a2e0d1dc65d1ceafd87cc84de61ccdb11 Mon Sep 17 00:00:00 2001
From: juan <juancloudcomputing@protonmail.com>
Date: Tue, 19 Oct 2021 22:58:02 +0800
Subject: [PATCH] add 1 to 5 in midnight (noooo)

---
 pset4/1-question.c | 27 +++++++++++++++++++++++++++
 pset4/2-ROT3.c     | 23 +++++++++++++++++++++++
 pset4/3-grade.c    | 31 +++++++++++++++++++++++++++++++
 pset4/4-primes.c   | 39 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 120 insertions(+)
 create mode 100644 pset4/1-question.c
 create mode 100644 pset4/2-ROT3.c
 create mode 100644 pset4/3-grade.c
 create mode 100644 pset4/4-primes.c

diff --git a/pset4/1-question.c b/pset4/1-question.c
new file mode 100644
index 0000000..58a0092
--- /dev/null
+++ b/pset4/1-question.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+int main(void) {
+  // Initialize variables
+  int n, temp;
+  scanf("%d", &n);
+
+  scanf("%d", &temp);
+  int min = temp, max = temp, sum = 0;
+  sum += temp;
+
+  for (int i = 0; i < n - 1; i++) {
+    scanf("%d", &temp);
+
+    sum += temp;
+
+    if (temp < min) {
+      min = temp;
+    }
+    if (temp > max) {
+      max = temp;
+    }
+  }
+
+  printf("%d %d %d\n", sum, max, min);
+  return 0;
+}
diff --git a/pset4/2-ROT3.c b/pset4/2-ROT3.c
new file mode 100644
index 0000000..0c2eede
--- /dev/null
+++ b/pset4/2-ROT3.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+// Declare prototypes
+int process(char c);
+
+int main(void) {
+  int temp;
+
+  while ((temp = getc(stdin)) != '\n') {
+    printf("%c", process(temp));
+  }
+  printf("\n");
+
+  return 0;
+}
+
+int process(char c) {
+	if (c >= 'a' && c <= 'z') {  // If c is a - z
+		return (c - 'a' + 3) % 26 + 'a';
+	}
+	else 
+		return (c - 'A' + 3) % 26 + 'A'; // Else if c is A - Z
+}
diff --git a/pset4/3-grade.c b/pset4/3-grade.c
new file mode 100644
index 0000000..9f0887a
--- /dev/null
+++ b/pset4/3-grade.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+void get_score(int s);
+
+int main(void) {
+  // Initialize variables and get input from stdin
+  int score;
+  scanf("%d", &score);
+
+	get_score(score);
+
+  return 0;
+}
+
+void get_score(int s) {
+  if (s > 100) {
+    printf("The score is out of range!\n");
+  } else if (s >= 90) {
+    printf("A\n");
+  } else if (s >= 80) {
+    printf("B\n");
+  } else if (s >= 70) {
+    printf("C\n");
+  } else if (s >= 60) {
+    printf("D\n");
+  } else if (s >= 0) {
+    printf("E\n");
+  } else {
+		printf("The score is out of range!\n");
+	}
+}
diff --git a/pset4/4-primes.c b/pset4/4-primes.c
new file mode 100644
index 0000000..53e3c83
--- /dev/null
+++ b/pset4/4-primes.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+
+// Function prototypes
+void get_primes(void);
+int is_prime(int num);
+
+int main(void) {
+  // Initialize variables
+  int lines;
+  scanf("%d", &lines);
+
+  for (int i = 0; i < lines; i++) {
+    get_primes();
+  }
+  return 0;
+}
+
+void get_primes(void) {
+  int temp; // Temporary
+  int count = 0;
+  scanf("%d", &temp);
+
+  while (temp != -1) {
+    if (is_prime(temp) == 0) { // is_prime returns 1 aka. true
+      count++;
+    }
+    scanf("%d", &temp);
+  }
+
+  printf("%d\n", count);
+}
+
+int is_prime(int num) {
+  for (int j = 2; j < num; j++) {
+    if (num % j == 0)
+      return 1;
+  }
+  return 0;
+}