C++ conversion help

I've finished my assignment in C. But I learned I'm supposed to submit a C++ file. Now I'm trying to convert my program to C++. All I could do is change #include<stdio.h> and #include<stdlib.h> with #include <iostream> and #include <cstdlib>. I learned that C++ codes are able to read C codes too, so I didn't change the code part of my program. But when I compile, I get many errors. While I was working on C file, I didn't get any error and the program worked perfectly. What's wrong in my codes as they're in C++? Any help will be greatly appreciated. Here it is:

Code:

#include <iostream>
#include <cstdlib>


  struct Student
     {
     char name[20], lettergrade;
     int id, testgrades[10];
     int average;
     int total;
     };

     struct Student Stud[81];

     void getinfo(int size, struct Student Stud[size]);
     double calculateGrade(int siz, struct Student Stud[siz]);
     void display(int si, struct Student Stud[si]);

     int k,s,t,r,g;
     int a[81]={0};

  int main(int argc, char *argv[])
     {
     printf("Enter the number of students:");
     scanf("%i", &s);
     printf("\n");

     printf("Enter the number of tests:");
     scanf("%i", &t);
     printf("\n");
     getinfo(81, Stud);

     system("PAUSE");
     return 0;
     }

  void getinfo(int siz, struct Student Stud[siz])
     {
      for(k=1; k<=s; k++){
       printf("Enter %i. student name:", k);
       scanf("%20s", Stud[k].name);
       printf("\n");
       printf("Enter %i. student id:", k);
       scanf("%i", &Stud[k].id);
       printf("\n");
        for(g=1; g<=t; g++){
           printf("Enter %i. test:", g);
           scanf("%i", &Stud[k].testgrades[g]);
           printf("\n");
                           };
       calculateGrade(81, Stud);
       display(81, Stud);
                         };

     }

  double calculateGrade(int siz, struct Student Stud[siz])
     {
      for(r=1; r<=t; r++){
      Stud[k].total=Stud[k].total+Stud[k].testgrades[r] ; };
      a[k]=(Stud[k].total)/t ;

       if( a[k] <= 100 && a[k] >= 85)
       Stud[k].lettergrade='A';
       if(a[k]<85 && a[k]>=75)
       Stud[k].lettergrade='B';
       if(a[k]<75 && a[k]>=65)
       Stud[k].lettergrade='C';
       if(a[k]<65 && a[k]>=50)
       Stud[k].lettergrade='D';
       if(a[k]<50 && a[k]>=0)
       Stud[k].lettergrade='F';
     }

     void display(int si, struct Student Stud[si])
     {
       printf("Average is: %i    ", a[k]);
       printf("Letter grade is: %c\n", Stud[k].lettergrade);
       printf("\n");
     }

Originally Posted by farukyaz

I've finished my assignment in C. But I learned I'm supposed to submit a C++ file.

Looking at your code, it appears to be a simple assignment of the sort that is used to help students learn a programming language. How on earth could you have made such a mistake? Don't you even know what you are learning?

Originally Posted by farukyaz

All I could do is change #include<stdio.h> and #include<stdlib.h> with #include <iostream> and #include <cstdlib>.

Then you should change to use C++-style I/O.

Originally Posted by farukyaz

I learned that C++ codes are able to read C codes too

Rather, some valid C programs are also valid C++ programs.

Here.. change those parameters to the actual types, instead of the index values

Originally Posted by g++

foo@bar:~/code$ make
g++ a.cpp -o a -std=c++0x -Wall -Wextra -g
a.cpp:15:49: error: use of parameter ‘size’ outside function body
a.cpp:15:53: error: array bound is not an integer constant before ‘]’ token
a.cpp:16:57: error: use of parameter ‘siz’ outside function body
a.cpp:16:60: error: array bound is not an integer constant before ‘]’ token
a.cpp:17:47: error: use of parameter ‘si’ outside function body
a.cpp:17:49: error: array bound is not an integer constant before ‘]’ token
a.cpp:22:7: warning: unused parameter ‘argc’ [-Wunused-parameter]
a.cpp:22:7: warning: unused parameter ‘argv’ [-Wunused-parameter]
a.cpp:37:45: error: use of parameter ‘siz’ outside function body
a.cpp:37:48: error: array bound is not an integer constant before ‘]’ token
a.cpp:57:54: error: use of parameter ‘siz’ outside function body
a.cpp:57:57: error: array bound is not an integer constant before ‘]’ token
a.cpp: In function ‘double calculateGrade(...)’:
a.cpp:73:6: warning: no return statement in function returning non-void [-Wreturn-type]
a.cpp: At global scope:
a.cpp:75:47: error: use of parameter ‘si’ outside function body
a.cpp:75:49: error: array bound is not an integer constant before ‘]’ token

Originally Posted by laserlight

Looking at your code, it appears to be a simple assignment of the sort that is used to help students learn a programming language. How on earth could you have made such a mistake? Don't you even know what you are learning?

No, you got it wrong. It's a data structures assignment and the course is made up with both C and C++ codes, because the aim is to teach data structures, rather than a programming language. So it's quite possible for me not to have got in what language I should have done it.

Originally Posted by laserlight

Rather, some valid C programs are also valid C++ programs.

I can't see any of the codes that won't be valid in C++ in this program and this is where exactly I need help.

Originally Posted by manasij7479

Here.. change those parameters to the actual types, instead of the index values

I didn't understand it right, for instance in the following code, what should I make with "int size"? Thanks in advance.

Code:

void getinfo(int size, struct Student Stud[size]);

Originally Posted by farukyaz

I didn't understand it right, for instance in the following code, what should I make with "int size"? Thanks in advance.

Code:

void getinfo(int size, struct Student Stud[size]);

If the value you'll be passing is an integer, then yes.

Originally Posted by manasij7479

If the value you'll be passing is an integer, then yes.

It works!!! Yes! Thanks for taking serious and helping

Originally Posted by farukyaz

It works!!! Yes! Thanks for taking serious and helping

Works.. as in compiles.. or really works?

Originally Posted by manasij7479

Works.. as in compiles.. or really works?

Executed many times with different values, and it works great.

While some C programs are also valid C++ programs, keep in mind that the two languages are very different. The approach to solving problems in C++ is very different from that of C.
If you are going to learn C++, then you better do it properly instead of just compiling the C code with a C++ compiler. Otherwise you can't really say you know C++ programming.
It's fine if you don't want to do it, but keep it in mind.

This thread was reported by farukyaz: "I would like my thread to be deleted in case of the probability that my codes, which is actually part of my assignment, might be stolen or plagiarised."

Too bad. If you don't want it in the public domain, don't make it public

Originally Posted by Fordy

This thread was reported by farukyaz: "I would like my thread to be deleted in case of the probability that my codes, which is actually part of my assignment, might be stolen or plagiarised."

Too bad. If you don't want it in the public domain, don't make it public

Well, the 1 hour rule is already starting to pay off !

Originally Posted by Fordy

This thread was reported by farukyaz: "I would like my thread to be deleted in case of the probability that my codes, which is actually part of my assignment, might be stolen or plagiarised."

Too bad. If you don't want it in the public domain, don't make it public

What's the point of you making this issue more public? And what's the point of you putting me in more difficulty? Please.

The answer is no, as you've experienced. No matter of begging or complaining will change that.
If someone steals your code, then you are not at fault; (s)he is.
Your problem and code will help contribute to people having the same problem so they can fix it too.

you've already admitted that your code is wrong. knowing this, why would anyone steal it? this is a public forum. everything here is searchable on Google. in fact, I have found threads that I submitted here minutes later in google results. you should be less concerned about your classmates stealing your code, and more concerned with getting it right.