a grading program

**compugeek915** · 10-15-2007

Since this is my first post i would like to introduce myself, my name is Mike and i am currently a computer science student in michigan. We have to take a c programming class as our first programming class and we unfortunately got stuck with a very difficult to understand teacher who doesn't help us fix our programs he just tells us they are wrong. I will never come on here looking for someone to write my code just a nudge in the right direction as to why certain things aren't working.

The current program i am working on is a fairly simple grading program that looks at the student grade input and assigns a grade. then prints the grade. The one problem i am having is that the main() can only contain calls to other functions. here is what i have so far.

Code:

#include <stdio.h>

int ingrade();
char gradedec();
char gradeout();

int main()
{
    ingrade();
    gradedec(int grade3, int gradeavg, int gradeavgl);
    gradeout(char grade);
    
}
int ingrade()
{
    int grade1;
    int grade2;
    int grade3;
    int gradeavg;
    int gradeavgl;
    printf("Please enter your three test scores:");
    scanf("%d %d %d",&grade1,&grade2,&grade3);
    gradeavg = (grade1+grade2+grade3)/3;
    gradeavgl=(grade2+grade3)/2;
    return gradeavg;
    return grade3;
    return gradeavgl;
}
char gradedec(int grade3,int gradeavg,int gradeavgl)
{
    char grade;
    
     if(gradeavg>=90)
             {
                     grade='A';
             }    
     if(gradeavg<90,gradeavg>70)
             {
                                if(grade3>90)
                                            {
                                                   grade='A';
                                            }
                                if(grade3<90)
                                             {
                                                   grade='B';
                                             }
             }   
      if(gradeavg>50,gradeavg<70)
             {
                                 if(gradeavgl>70)
                                 {
                                                 grade='c';
                                 }
                                 else
                                     grade='D';
             }
       if(gradeavg<50)
       {
                      grade='F';
       }
       return grade;
}
char gradeout()
{
    printf("your current grade is:%d",grade);
    return 0;
}

the specific problem i seem to be having is transferring one variable from a function to another function or defining certain variables for certain functions for example the lines

Code:

gradedec(int grade3, int gradeavg, int gradeavgl);
gradeout(char grade);

I apologize to the moderator if this type of post isnt allowed, i read the rules and assumed since i was asking a specific question it would be ok, if not i understand.
thank you,
mike

**Prelude** · 10-15-2007

>teacher who doesn't help us fix our programs he just tells us they are wrong.
You don't have to suffer teachers like that. If he refuses to help you, that's neglecting to do his job, and you can report him for it.

>gradedec(int grade3, int gradeavg, int gradeavgl);
>gradeout(char grade);
You don't include the data types when calling a function, and it's generally a good idea for the variables that you use as arguments to be in scope. I'd expect your main to look like this:

Code:

#include <stdio.h>

/*
  Read scores up to the limit, store the number of loaded scores in n
*/
int load_scores ( int scores[], int limit, int *n );

/*
  Given a list of scores, determine a letter grade and display it
*/
void show_grade ( FILE *out, int scores[], int n );

int main ( void )
{
  int scores[3];
  int n;

  if ( load_scores ( scores, 3, &n ) ) {
    /* All scores were loaded */
    show_grade ( stdout, scores, n );
  }

  return 0;
}

Somehow I doubt your teacher wants you to work out a way to have only function calls (and no declarations) in main.

**compugeek915** · 10-15-2007

thank you for your quick response. I moved my declarations to the main function. and now the program actually runs but i get the same output everytime, "119". I assumed i defined something wrong but if it was just an ASCII declaration 119 is "w" which i have no where in my code.

any other input appreciated

thanks
mike

**Doorsdown** · 10-15-2007

http://www.google.com/search?hl=en&q...=Google+Search <-- for the ascii tables

this would be a nice neat way of doing your program

Code:

#include <stdio.h>

char gradedec(int);

int main()
{
        int grade1, grade2, grade3;

        printf("Please enter your three test scores: ");
        scanf("%d %d %d",&grade1,&grade2,&grade3);
        printf("Your Class Grade is %c.\n",gradedec((grade1+grade2+grade3)/3));

        return 0;
}

char gradedec(int average)
{
        if(average>=90)
                return 'A';
        else if(average>=80)
                return 'B';
        else if(average>=70)
                return 'C';
        else if(average>=65)
                return 'D';
        else
                return 'F';
}

heres the output

Code:

ryan@slayer ~ $ gcc grade.c
ryan@slayer ~ $ ./a.out
Please enter your three test scores: 70 80 90
Your Class Grade is B.
ryan@slayer ~ $

**compugeek915** · 10-16-2007

you guys are awesome, and please dont get me wrong im looking more so for why my code isnt working not the solution.

Code:

#include <stdio.h>

int ingrade();
char gradedec();
char gradeout();

int main()
{
  
    int grade1;
    int grade2;
    int grade3;
    int gradeavgl;
    char grade;

    ingrade();
    gradedec(int gradeavg,int gradeavgl,int grade);
    gradeout();


    return 0;
    
}
int ingrade(int gradeavg,int grade3,int gradeavgl,int grade2,int grade1)
{
    
    printf("Please enter your three test scores:");
    scanf("%d %d %d",&grade1,&grade2,&grade3);
    gradeavg = (grade1 + grade2 + grade3)/3;
    gradeavgl=(grade2+grade3)/2;
    return gradeavg;
    return grade3;
    return gradeavgl;
	return grade1;
	return grade2;
}
char gradedec(int gradeavg,int gradeavgl,int grade)
{
	int grade
    
     if(gradeavg>=90)
                                grade='A';           
     else if(gradeavg<=90,gradeavg>=70)
	 {
                                if(grade3>90)
                                     return 'A';
                                            
                                else if(grade3<90)
									return 'B';
             }   
      else if(gradeavg>=50,gradeavg<=70)
             {
                                 if(gradeavgl>70)
                                                return 'C';
                                 
                                 else if(gradeavgl<70)
                                     return 'D';
             }
       
       else 
            return 'F';
       ;
}
gradeout(grade)
{
    printf("your current grade is:%c", gradedec);
    return 0;
}

any input, anything that even would get me closer is greatly appreciated.

thanks,
mike

**Doorsdown** · 10-16-2007

ok, your function gradeout, in your declaration you have it returning a char but when you use it you pass it a char

Code:

char gradeout()
gradeout(grade)
{
    printf("your current grade is:&#37;c", gradedec);
    return 0;
}

when you have a function that return a int like this, if you just put avg(myarray) in your code the returning result won't go any where.

Code:

int avg(int nums[])
{
    int avg = 0, i = 0;
    while(nums[i]!='\0')
    {
        avg += nums[i++];
    }
    return (avg/i);
}


avg(myNums); //wrong
int result = avg(myNums); //correct

**kcpilot** · 10-17-2007

This works:

Code:

#include <stdio.h>

void ingrade();
char gradedec();
void gradeout();

int grade1 = 0;
int grade2 = 0;
int grade3 = 0;
int gradeavgl = 0;
int gradeavg = 0;
char grade = 'X';

int main()
{
  
    ingrade();

    printf("GRADE1 = %d  GRADE2 = %d   GRADE3 = %d\n", grade1,grade2,grade3);

    grade = gradedec(gradeavg, gradeavgl, grade);
    gradeout(grade);


    return 0;
    
}
void ingrade()
{
    
    printf("Please enter your three test scores:");
    scanf("%d %d %d",&grade1,&grade2,&grade3);

    printf("Your 3 scores are %d  %d  %d\n", grade1, grade2, grade3);

    gradeavg = (grade1 + grade2 + grade3)/3;
    printf ("GRADEAVG = %d\n", gradeavg);
    gradeavgl=(grade2+grade3)/2;
    printf ("GRADEAVGL = %d\n", gradeavgl);
//    return gradeavg;
//    return grade3;
//    return gradeavgl;
//	 return grade1;
//	 return grade2;
}
char gradedec(int gradeavg,int gradeavgl,char grade)
{
    
     if(gradeavg >= 90)
        grade='A';           
     else if(gradeavg<90 && gradeavg >= 80)
  		  grade = 'B';
     else if(gradeavg < 80 && gradeavg <= 70)
        grade = 'C';
     else if(gradeavgl < 70 && gradeavgl>= 60)
        grade = 'D';
     else 
        grade = 'F';
     
     printf("YOUR GRADE IS %c\n", grade);
     return grade;
}
void gradeout(char grade)
{
    printf("your current grade is: %c", grade);
}

**Doorsdown** · 10-19-2007

yes but it heavily depends on global variables which for the most part is frowned upon as it works here but it could cause lots of trouble in a bigger program

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