From 775b4bd643cc8d6c023434a09efb8a03682afc7c Mon Sep 17 00:00:00 2001
From: Alvie Rahman <alvierahman90@gmail.com>
Date: Tue, 10 Oct 2023 11:24:31 +0100
Subject: [PATCH] C19

---
 C19/ex1.c | 20 ++++++++++++++++++++
 C19/ex2.c | 25 +++++++++++++++++++++++++
 C19/ex3.c | 27 +++++++++++++++++++++++++++
 C19/ex4.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 122 insertions(+)
 create mode 100644 C19/ex1.c
 create mode 100644 C19/ex2.c
 create mode 100644 C19/ex3.c
 create mode 100644 C19/ex4.c

diff --git a/C19/ex1.c b/C19/ex1.c
new file mode 100644
index 0000000..f6dcd03
--- /dev/null
+++ b/C19/ex1.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+
+struct Person {
+	int age;
+	char forename[30];
+	char surname[50];
+};
+
+
+int main() {
+	struct Person p;
+
+	printf("Enter age: "); scanf("%d", &p.age);
+	printf("Enter forename: "); scanf("%29s", p.forename);
+	printf("Enter surname: "); scanf("%49s", p.surname);
+
+	printf("p.age=%d p.forename=%s p.surname=%s\n", p.age, p.forename, p.surname);
+	return 0;
+}
diff --git a/C19/ex2.c b/C19/ex2.c
new file mode 100644
index 0000000..51e153c
--- /dev/null
+++ b/C19/ex2.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+
+struct Person {
+	int age;
+	char forename[30];
+	char surname[50];
+};
+
+
+void print_person(struct Person p) {
+	printf("p.age=%d p.forename=%s p.surname=%s\n", p.age, p.forename, p.surname);
+}
+
+
+int main() {
+	struct Person p;
+
+	printf("Enter age: "); scanf("%d", &p.age);
+	printf("Enter forename: "); scanf("%29s", p.forename);
+	printf("Enter surname: "); scanf("%49s", p.surname);
+
+	print_person(p);
+	return 0;
+}
diff --git a/C19/ex3.c b/C19/ex3.c
new file mode 100644
index 0000000..96dc041
--- /dev/null
+++ b/C19/ex3.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+
+struct Person {
+	int age;
+	int year_of_birth;
+	char forename[30];
+	char surname[50];
+};
+
+
+void print_person(struct Person p) {
+	printf("p.age=%d p.year_of_birth=%d p.forename=%s p.surname=%s\n", p.age, p.year_of_birth, p.forename, p.surname);
+}
+
+
+int main() {
+	struct Person p;
+
+	printf("Enter age: "); scanf("%d", &p.age);
+	printf("Enter birth year: "); scanf("%d", &p.year_of_birth);
+	printf("Enter forename: "); scanf("%29s", p.forename);
+	printf("Enter surname: "); scanf("%49s", p.surname);
+
+	print_person(p);
+	return 0;
+}
diff --git a/C19/ex4.c b/C19/ex4.c
new file mode 100644
index 0000000..76b47cf
--- /dev/null
+++ b/C19/ex4.c
@@ -0,0 +1,50 @@
+#include <stdio.h>
+
+
+struct Person {
+	int age;
+	int year_of_birth;
+	char forename[30];
+	char surname[50];
+};
+
+
+void print_person(struct Person p) {
+	printf("p.age=%d p.year_of_birth=%d p.forename=%s p.surname=%s\n", p.age, p.year_of_birth, p.forename, p.surname);
+}
+
+
+int main() {
+	struct Person p;
+	FILE *fp;
+	char choice;
+	char filename[4097];
+
+	printf("Read or write a file? (r/w) "); scanf("%c", &choice);
+
+	if (choice == 'w') {
+		printf("Enter age: "); scanf("%d", &p.age);
+		printf("Enter birth year: "); scanf("%d", &p.year_of_birth);
+		printf("Enter forename: "); scanf("%29s", p.forename);
+		printf("Enter surname: "); scanf("%49s", p.surname);
+
+		printf("Enter filename to save to: "); scanf("%4096s", filename);
+		fp = fopen(filename, "wb");
+		if (fp == NULL) {
+			printf("Failed to open file for writing\n");
+			return 1;
+		}
+		fwrite(&p, 1, sizeof(p), fp);
+	} else {
+		printf("Enter file to read from: "); scanf("%4096s", filename);
+		fp = fopen(filename, "rb");
+		if (fp == NULL) {
+			printf("Failed to open file for reading\n");
+			return 1;
+		}
+		fread(&p, 1, sizeof(p), fp);
+	}
+
+	print_person(p);
+	return 0;
+}