Upload files to "OS/C/Week5"

OS/C/Week5/q2.c

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+// stdlib import
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// bash utilities import
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+void main () {
+
+	// array declaration
+	char *strings[5];
+	char *string_cpy[5];
+	char temp[100];
+
+	// variables reqd
+	int i,j;
+	pid_t pid;
+	int status;
+
+	// input
+	printf("Enter strings to print: \n");
+	for (i = 0; i < 5; i++) {
+		strings[i] = malloc (100 * sizeof(char));
+		string_cpy[i] = malloc (100 * sizeof(char));
+		fgets(strings[i],100,stdin);
+		strcpy(string_cpy[i], strings[i]);
+	}
+
+	// forking
+	pid = fork();
+
+	// child process
+	if (pid == 0) {
+		printf("\n Child Process: \n");
+		for (i = 0; i < 5; i++) {
+			for (j = 0; j < 5 - i - 1; j++) {
+				if (strcmp(strings[j], strings[j + 1]) > 0){
+					strcpy(temp, strings[j]);
+					strcpy(strings[j], strings[j+1]);
+					strcpy(strings[j+1], temp);
+				}
+			}
+		}
+
+
+		for (i = 0; i < 5; i++) {
+			printf("\n Child: %s \n", strings[i]);
+		}
+
+		printf("\n");
+		exit (00);
+
+	// parent process
+	} else if (pid > 0) {
+		wait(&status);
+		printf("\n Parent Process: \n");
+		for (i = 0; i < 5; i++) {
+			printf("\n Parent: %s \n", string_cpy[i]);
+			printf("%d",WEXITSTATUS(status));
+		}
+
+	// exception handling (catchall statement)
+	} else {
+		printf("THE SYSTEM ENCOUNTERED AN ERROR. Please try again later or debug the code. \n");
+	}
+
+}
+
+

OS/C/Week5/q3.c

@@ -0,0 +1,87 @@
+// os exec libraries
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+// std C libraries
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+// bubble sort
+void bubble(char *arr[], int n) {
+	int i,j;
+	for (i = 0; i < n - 1; i++) {
+		for (j = 0; j < n - i - 1; j++) {
+            		if (strcmp(arr[j], arr[j + 1]) > 0) {
+                		char *temp = arr[j];
+                		arr[j] = arr[j + 1];
+                		arr[j + 1] = temp;
+            		}
+        	}
+    	}
+    	for(i=0;i<n;i++){
+        	printf("%s ",arr[i]);
+    	}
+}
+
+
+void selection(char *arr[], int n) {
+	int i,j;
+    	for (i = 0; i < n - 1; i++) {
+        	int min_idx = i;
+        	for (j = i + 1; j < n; j++) {
+            		if (strcmp(arr[j], arr[min_idx]) < 0) {
+                	min_idx = j;
+            		}
+        	}
+		char *temp = arr[min_idx];
+        	arr[min_idx] = arr[i];
+        	arr[i] = temp;
+    	}
+    	for(i=0;i<n;i++){
+        	printf("%s ",arr[i]);
+    	}
+}
+
+int main() {
+	int N,i;
+
+    	printf("Enter the number of strings:\n ");
+    	scanf("%d", &N);
+
+	char **strings = (char **)malloc(N * sizeof(char *));
+	printf("Enter %d strings:\n", N);
+
+	for (i = 0; i < N; i++) {
+        	strings[i] = (char *)malloc(100 * sizeof(char));
+        	printf("String %d: ", i + 1);
+        	scanf("%s", strings[i]);
+    	}
+
+	pid_t pid1;
+    	pid_t pid2;
+
+	int status;
+    	pid1=fork();
+
+	if (pid1 == 0) {
+        	printf("\nFirst child: Bubble sort\n");
+        	bubble(strings,N);
+        	exit(0);
+    	} else if (pid1 > 0) {
+        	pid2 = fork();
+        	if (pid2 == 0) {
+            		printf("\nSecond child: Selection sort\n");
+            		selection(strings,N);
+            		exit(0);
+        	} else if (pid2 > 0) {
+            		wait(&status);
+            		printf("\n Parent: Child process terminated\n");
+        	} else {
+            		printf("The system encountered an error.");
+        	}
+    	} else {
+        	printf("Error");
+    	}
+}