initial commit

vansh/Alti_implemented/auth.c

@@ -0,0 +1,82 @@
+#include "auth.h"
+
+
+ld
+toRadians(ld degree){
+    ld one_deg = (M_PI)/180;
+    return (one_deg * degree);
+}
+
+ld
+sq_root(ld value){
+    ld err = 1e-10;
+
+    ld ans = 0;
+    ld low = 0 , high = 0;
+
+	if(value < 1){
+		low = value , high = 1;
+	}
+	else{
+		low = 1 , high = value;
+	}
+
+    for(int i = 1 ; i <= 67 ; i++ ){
+
+        ld mid = low + (high - low)/2.0;
+
+        if( mid*mid <= value ){
+            ans = mid;
+            low = mid + err;
+        }
+        else{
+            high = mid - err;
+        }
+    }
+
+    return ans;
+}
+
+ld
+orthodromic_distance(ld stu_lat,ld stu_long,ld teach_lat,ld teach_long){
+    stu_lat = toRadians(stu_lat);
+    stu_long = toRadians(stu_long);
+    teach_lat = toRadians(teach_lat);
+    teach_long = toRadians(teach_long);
+
+    ld diff_lat = teach_lat - stu_lat;
+    ld diff_long = teach_long - stu_long;
+
+    ld ans = pwr2(sin(diff_lat/2)) +
+                cos(stu_lat) * cos(teach_lat) *
+                pwr2(sin(diff_long/2));
+
+    ans = 2 * asin(sq_root(ans));
+
+
+    // Radius of Earth in
+    // Kilometers, R = 6371
+    // Use R = 3956 for miles
+    ld R = 6371;
+
+	//ans in meter...
+    ans = ans * R * (ld)1000;
+    return ans;
+}
+
+ld
+altitude_difference(ld teach_alti, ld stu_alti)
+{
+    ld diff_alti = teach_alti - stu_alti;
+
+    return diff_alti;
+}
+
+
+
+bool
+check_range(ld dist, ld alti){
+    //better implementation for future....
+    // the 100 needs to be changed to (db.Room.length)
+    return dist <= (ld)100 && (alti >= -3 && alti <= 4);
+}

vansh/Alti_implemented/auth.h

@@ -0,0 +1,30 @@
+#ifndef __AUTH__
+#define __AUTH__
+
+#ifndef _MATH_H_
+#include <math.h>
+#endif
+
+#ifndef _STDBOOL_H
+#include <stdbool.h>
+#endif
+
+#define ld long double
+#define pwr2(x) (x * x)
+
+ld
+sq_root(ld x);
+
+ld
+toRadians( ld degree );
+
+ld
+orthodromic_distance(ld stu_lat, ld stu_long, ld teach_lat, ld teach_long);
+
+ld
+altitude_difference(ld teach_alti, ld stu_alti);
+
+bool
+check_range(ld dist, ld alti);
+
+#endif // __AUTH__

vansh/Alti_implemented/main.c

@@ -0,0 +1,93 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include <string.h>
+#include<mysql.h>
+#include "auth.h"
+
+void
+error_found(MYSQL *con){
+	printf("%s\n",mysql_error(con));
+	mysql_close(con);
+}
+
+int
+main(int argv , char **argc){
+	//Pass the Teacher latitude and longitude from command line argument.
+   	//Teacher latitude and longitude...
+  	ld teach_lat = strtold(argc[1],NULL) , teach_long = strtold(argc[2],NULL);
+  	//Altitude as the 3rd argument.
+    ld teach_alti = strtold(argc[2],NULL);
+
+	MYSQL *con = mysql_init(NULL);
+
+
+	if( con == NULL ){
+		printf("mysql_init() failed\n");
+		return 0;
+    	}
+
+	if( mysql_real_connect(con,"localhost","usr","admin@1224"
+			,"bpitattendance", 0,NULL,0) == NULL ){
+		error_found(con);
+	}
+
+	if( mysql_query(con, "SELECT * FROM attendance") ){
+		error_found(con);
+	}
+
+	MYSQL_RES *result = mysql_store_result(con);
+
+	if( result == NULL ){
+		error_found(con);
+	}
+
+	int num_fields = mysql_num_fields(result);
+
+	MYSQL_ROW row;
+
+	int enroll = 0;
+	long double stu_lat = 0 , stu_long = 0;
+	long double dist = 0;
+	char en_num[15];
+	char query[150]="";
+
+	while( (row = mysql_fetch_row(result) ) ){
+
+		enroll = (int)strtoll(row[0],NULL,10);
+		stu_lat = strtold(row[1],NULL);
+		stu_long = strtold(row[2],NULL);
+        stu_alti = strtold(row[3], NULL);
+
+		strcpy(query,"");
+		sprintf(en_num,"%d",enroll);
+		dist = orthodromic_distance(stu_lat,stu_long,teach_lat,teach_long);
+
+		alti = altitude_difference(teach_alti,stu_alti);
+
+		if( check_range(dist,alti) ){
+			strcat(query,"UPDATE attendance SET is_present = true WHERE enroll_num =");
+			strcat(query,en_num);
+			strcat(query,";");
+			if( mysql_query(con, query ) ){
+				error_found(con);
+			}
+			printf("%ld is present\n",enroll);
+		}
+		else{
+			strcat(query,"UPDATE attendance SET is_present = false WHERE enroll_num =");
+			strcat(query,en_num);
+			strcat(query,";");
+			if( mysql_query(con,query ) ){
+				error_found(con);
+			}
+			printf("%ld is absent\n",enroll);
+		}
+
+	}
+
+	mysql_free_result(result);
+	mysql_close(con);
+
+
+    	return 0;
+}