getting error like "call to funtion with no prototype"

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here i m making an aplication on school mgmt in c language.
nw my problem is i have declared my all the function. bt when i m using that functionin my code.
my compiler gives me a warning msg that " call to funtion with no prototype"

plz suggest me some solution for this kind of problem
thanks in advance

my code is below

C#

#include<conio.h>
#include<stdio.h>

int bubble(int*,int);
 void filewrite();
 void avgmarks();
 void fileprint();
 void filesort();
 void rollin();

/*********************** SORTING FUNCTION ***************************/
int bubble(int x[],int n)
{
 int hold,j,pass,i,switched = 1;
 for(pass = 0; pass < n-1 && switched == 1;pass++)
 {
  switched=0;
  for (j=0;j<n-pass-1;j++)
   if (x[j]>x[j+1])
   {
    switched=1;
    hold = x[j];
    x[j] = x[j+1];
    x[j+1]=hold;
    }
   }
return(0);
}
/*********************** FILE WRITING FUNCTION ******************************/
void filewrite()
{
  int roll,ch,mark;
  char nam[50];
   FILE *fp;
   clrscr();
  fp = fopen("student.txt","a");
   printf("ENTER ROLL NUMBER, NAME , MARKS \n");
  ch =1;
  while(ch)
  {
  scanf("%d%s%d",&roll,&nam,&mark);
  fprintf(fp,"%d %s %d\n",roll,nam,mark);
  printf("\n\n press 1 to continue,0 to stop");
  scanf("%d",&ch);
  }
   fclose(fp) ;
}
/******************** OUTPUTING DATA ON SCREEN***************/
void fileprint()
{
  int marks[100],rollno[100],x[100],i;
  char name[100][50];
  FILE *fp;

  clrscr();
  fp = fopen("student.txt","r");
   i=0;
   printf("ROLLNO       NAME        MARK\n");
   while(!feof(fp))
  {
     fscanf(fp,"%d %s %d\n",&rollno[i],&name[i],&marks[i]);
     printf(" %d          %s          %d\n",rollno[i],name[i],marks[i]);
     i=i+1;
   }
   fclose(fp);
   printf("\n\n\nPRESS ANY KEY");
   getch();

  }
/******************* SORTING FILE ************************/
void filesort()
  { int marks[100],rollno[100],x[100],n,i,j;
    char name[100][50];
    FILE *fp,*fm;

    fp = fopen("student.txt","r");
    fm = fopen("marks.txt","w");
    i=0;
   while(! feof(fp))
    {

     fscanf(fp,"%d %s %d\n",&rollno[i],&name[i],&marks[i]);
     x[i]= marks[i];
     i=i+1;
      }

       n=i;

       bubble(x,n);

    for(i=0;i<n;i++)
    {
    printf(" %d\t",x[i]);
    }

 for(i=0;i<n;i++)
 {
   for (j=0;j<n;j++)
   {
   if(x[i]==marks[j])
   {
      fprintf(fm,"%d %s %d\n",rollno[j],name[j],marks[j]);
     }
   }
 }
  fclose(fm);
  fclose(fp);
  printf("\n\n\nPRESS ANY KEY");
  getch();

}
/************************* DATA USING ROLLNO***************************/
void rollin()
{   int i,roll,ch,mark,roll1;
    char nam[50];
    FILE *fm;

    ch=1;
  while(ch)
  { clrscr();
    fm = fopen("marks.txt","r");
    printf(" \n ENTER ROLL NUMBER - ");
    scanf("%d",&roll1);
      i=0;
   while(! feof(fm))
    {
     fscanf(fm,"%d %s %d\n",&roll,&nam,&mark);
     if(roll1==roll)
    {printf("\nROLLNO.     NAME        MARKS\n ");
     printf(" %d          %s          %d\n",roll,nam,mark);
     break;
     }
     else
     i=i+1;
      }
  printf("\n\npress 1 to see student info, 0 to return to main menu\n");
  scanf("%d",&ch);
  fclose(fm);
  }



 }

void avgmarks()
 {
    int marks[100],rollno[100],n,i;
    float avg,x;
    char name[100][50];
    FILE *fm;
    fm = fopen("marks.txt","r");
    i=0;
   while(! feof(fm))
    {

     fscanf(fm,"%d %s %d\n",&rollno[i],&name[i],&marks[i]);
     x = x + marks[i];
     i=i+1;
      }
     n = i;
   avg = x/n;
  printf("AVERAGE MARKS OF %d STUDENTS ARE -  %f ",n,avg);
  fclose(fm);
  printf("\n\n\nPRESS ANY KEY");
   getch();

 }



void main()
{
  int marks[100],rollno[100],x[100],n,i,j,roll,c,mark,roll1;
  char name[100][10],nam[50];

  while(c!=6)
   {
     clrscr();
     printf("GIVE CHOICE--\n");
     printf("   1 TO ENTER STUDENT INFO.\n");
     printf("   2 TO SEE STUDENT.TXT FILE\n");
     printf("   3 TO SORT FILE ON BASIS OF MARKS\n");
     printf("   4 TO PRINT STUDENT INFO. USING ROLL NO\n");
     printf("   5 TO FIND AVERAGE OF MARKS\n");
     printf("   6 TO EXIT\n\n--");
     scanf("%d",&c);
     clrscr();
     switch(c)
     {
     case 1:
          filewrite();
          break;
     case 2:
          fileprint();
         break;
     case 3:
         filesort();
         break;
     case 4:  rollin();
          break;
     case 5:  avgmarks();
          break;
     case 6:
          break;
     default:
          break;
     }
    }
getch();
  }

Posted 11-Nov-13 5:21am

Member 10011989

Updated 11-Nov-13 5:54am

v4

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Comments

Sergey Alexandrovich Kryukov 11-Nov-13 11:42am

I would strongly advise you to modify the title of the question, as right now it creates a false impression that you wanted to call a function without prototype. Add some words indicating that this is an error message.
—SA

Richard MacCutchan 11-Nov-13 13:05pm

Since all your functions appear in the file before they are referenced you do not need the prototypes.

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OriginalGriff · Answer 1 · 2013-11-11T05:42:00

Solution 1

The easiest thing to do is to prototype your function - you do that by writing a "short form" of the function definition at the top of the file, before you try call the function.
For example:

C++

int Add(int, int);   /* Prototype - before first use */
    
    int main (void)
        {
        return Add(3, 4);            /* First use */
        }
    
    int Add(int a, int b)            /* Function declaration */
        {
        return a + b;
        }

That way, the compiler gets to know what parameters to expect you to pass into and out of the function before you try to use it, and doesn't have to "back-track" to check them once it gets to the actual function declaration.

Posted 11-Nov-13 5:42am

OriginalGriff

Comments

Member 10011989 11-Nov-13 11:57am

yup i've done the same bt still i'm getting this warning.
wht to do?

OriginalGriff 11-Nov-13 12:02pm

Which line is it warning on (I see you have posted the code now)?

Member 10011989 12-Nov-13 5:31am

in cmy switch case code

OriginalGriff 12-Nov-13 6:02am

OK - I just pasted your code into VS, and - once I'd provided a dummy method for crlscr - it compiled cleanly, exactly as it is in your example.

Exactly which line is it complaining about?
If possible, copy and paste the complete error message (and tell me which compiler / IDE you are using)

Albert Holguin 11-Nov-13 13:51pm

Usually the compiler will tell you the line it has an issue with... Go to that line, see if function it is referring to has a prototype declaration and go from there (it's also possible that you're using a call with "no matching prototype" meaning there's something close but not right).

Richard MacCutchan · Answer 2 · 2013-11-11T07:11:00

Solution 2

See http://support.microsoft.com/kb/99261[^].

Posted 11-Nov-13 7:11am

Richard MacCutchan