I keep getting 0x488144 and another one before my output - c++

Question

Picture of error when input is jst L
#include <iostream>
using namespace std;
int main()
{
string student_name;
cout << "Enter student name\n";
cin >> student_name;
string student_surname;
cout << "Enter Student surname\n";
cin >> student_surname;
string student_id;
cout << "Enter Student ID\n";
cin >> student_id;
string student_group;
cout << "Enter Student Group\n";
cin >> student_group;
string Module_code;
cout << "Enter Module Code\n";
cin >> Module_code;
float test1;
cout << "Enter Test 1 mark\n";
cin >> test1;
float test2;
cout << "Enter Test 2 mark\n";
cin >> test2;
float final_mark;
final_mark = (test1 + test2) / 2;
cin >> final_mark;
string grade;
if (final_mark >= 80) {
grade = "A";
cin >> grade;
}
else if (final_mark >= 70) {
cout << "B";
cin >> grade;
}
else if (final_mark >= 60) {
grade = "C";
cin >> grade;
}
else if (final_mark >= 50) {
grade = "D";
cin >> grade;
}
else if (final_mark >= 40) {
grade = "E";
cin >> grade;
}
else (final_mark <= 30);
{
grade = "F";
cin >> grade;
} /*final code*/ cout << "LOMKOWKING UNIVERSITY\n";
cout << "ESWATINI CAMPUS\n";
cout << "STUDENT RESULT\n";
cout << "STUDENT NAME :" << cout << student_surname << student_name << endl;
cout << "STUDENT ID :" << cout << student_id << endl;
cout << "STUDENT GROUP :" << cout << student_group << endl;
cout << "MODULE CODE :" << cout << Module_code << endl;
cout << "Test 1 :" << cout << test1;
cout << "Test 2" << cout << test2 << endl;
cout << "Final Mark :" << cout << final_mark;
cout << "Grade :" << cout << grade << endl;
return 0;
}

Answer 1

#include <bits/stdc++.h>
using namespace std;
int main() {
string student_name;
cout<< "Enter student name\n";
cin>>student_name;
string student_surname;
cout<<"Enter Student surname\n";
cin>>student_surname;
string student_id;
cout<<"Enter Student ID\n";
cin>>student_id;
string student_group;
cout<<"Enter Student Group\n";
cin>>student_group;
string Module_code;
cout<<"Enter Module Code\n";
cin>>Module_code;
float test1;
cout<<"Enter Test 1 mark\n";
cin>>test1;
float test2;
cout<<"Enter Test 2 mark\n";
cin>>test2;
float avg;
avg = (test1 + test2) / 2;
string grade;
if(avg<=40){
grade = "F";
}
else if(avg<=50 && avg>40){
grade = "E";
}
else if(avg<=60 && avg>50){
grade = "D";
}
else if(avg<=70 && avg>60){
grade = "C";
}
else if(avg<80 && avg>70){
grade = "B";
}
else if(avg>=80){
grade = "A";
}
/*final code*/
cout<< "LOMKOWKING UNIVERSITY\n";
cout<<"ESWATINI CAMPUS\n";
cout<< "STUDENT RESULT\n";
cout<< "STUDENT NAME :" <<student_surname << " " <<student_name << endl;
cout<< "STUDENT ID :" <<student_id << endl;
cout<< "STUDENT GROUP :"<<student_group << endl;
cout<< "MODULE CODE :"<<Module_code << endl;
cout<< "Test 1 :" <<test1<<endl;
cout<< "Test 2: "<<test2 << endl;
cout<< "Final score :"<<avg << endl;
cout<< "Grade :"<<grade<<endl;
return 0;
}
please, do not input "L" as a value to float variables (i.e. test1 and test2)