Thread: Declaration of own function

I receive warrning: Implict declaration of function
How can I resolve this warrning?

p.s. my function is transp()

Code:

#include <stdio.h>

int main()

{


    printf("Iveskite bet koki sveikaji skaiciu intervale nuo 0 iki 999999999.\n");
    printf("\n");
    transp(); /* mano funkcija*/
    return 0;
}

/*Mano funkcija transp()*/
#include <stdio.h>

int transp()
   {
    int a,b,c,i,j,l,m,x,keiti;
    int me=-1,mdy=-1,z=8,sum=0;
    int mas[z], masx[z];
    scanf("%10d", &a);
    printf("\n");
    printf("%d - Jusu ivestas skaicius. \n", a);
    for(b=a; b%100000000!=0; b/=10) /*ciklas nustatantis skaiciaus elementu skaiciu,
                                      masyvo dydi, bei sukeliantis skaiciaus elementus i masyva*/
        {
         mdy++;
         me++;
         c=b%10;
         mas[me]=c;
        }
    printf("\n");
    if(me+1>9) /*nustato ar ivestas ne per didelis skaicius*/
        {
         printf("Jus ivedete per dideli skaiciu.\n");
         return 0;
        }
    else
    printf("Skaicius susideda is %d skaitmenu.\n", me+1);
    printf("\n");
    l=1;
    do
        {
         for(i=0; i<mdy; i++) /*masyvo elementu rikiavimas pagal uzduoti*/
         if(mas[i]<mas[i+1])
            {
             keiti=mas[i];
             mas[i]=mas[i+1];
             mas[i+1]=keiti;
            }
         l++;
        }
    while(l!=10); /*operacija kartojama kad tikrai visi skaiciai susirikiuotu taip kaip reikia*/
    printf("Pagal uzduoti pertvarkytas skaicius yra: \n");
    printf("\n");
    x=0;
    z=mdy;
    for(j=1; j<=1000000000; j*=10) /*surikiuoto masyvo elementu pavertimas 1 skaiciumi*/
        {
         if(x>mdy)
         break;
         m=1*j;
         masx[z]=m;
         z--;
         x++;
        }
    for(i=0; i<=me; i++)
    sum=sum+(mas[i]*masx[i]);
    printf("%d \n", sum);
    return 0;
   }

you have to use

Code:

#include<stdio.h>

only before main.
you have to give the prototype of

Code:

int transp()

before using it in main.

Originally Posted by joybanerjee39

you have to use

Code:

#include<stdio.h>

only before main.
you have to give the prototype of

Code:

int transp()

before using it in main.

How can I do it?

Originally Posted by Minderis

How can I do it?

You include the library only once before main function and add prototype before using it in main.
Example:

Code:

//Include the library
#include <stdio.h>
//prototype of function
int transp();
//main function
int main()
{
.......
//Call functions
......
return 0;
}
//Write body of function here.
int transp()
{
......
}

Sorry my english is very bad!.

Originally Posted by cauberong09

You include the library only once before main function and add prototype before using it in main.
Example:

Code:

//Include the library
#include <stdio.h>
//prototype of function
int transp();
//main function
int main()
{
.......
//Call functions
......
return 0;
}
//Write body of function here.
int transp()
{
......
}

Sorry my english is very bad!.

don't do that.
let him research a bit and actually learn.

Alternatively you can just move the text of the function above main in your source code.

C reads "top down" and doesn't know about anything it hasn't seen yet... so if you want it to find stuff you have to either prototype it or declare it before it's called.

Thanks for answers.
to: joybanerjee3
Yes, I was read your links, and find how to declarate function it was exactly like cauberong09 wrote.

Originally Posted by joybanerjee39

don't do that.
let him research a bit and actually learn.

Oh,I am sorry,I will notice after.Thanks you.