functions and pointers

[SlykFX]

Apologises if this is covered somewhere else but i did a search and couldnt find what i need

im trying to pass an int pointer from one function to another and cos i dont understand the question, the ode below explains a little better

int main(void)
{
  int location[maxNum];
  getValues(location);
}
void getValues(int *l)
{
  *l = getInput(???); // what is it i need to pass here?
}
void getInput(int *p)
{
}

im either more tired than i feel or its a little more difficult than this

thanks for any help

I can't be bothered to have a sig!

 

[itsgsd]

This depends on what is going to happen in getInput(), but here's my best guess.

int main(void)
{
  int location[maxNum];
  getValues(location);
}
void getValues(int *l)
{
  getInput(l);  // like this 
  // *l = getInput(???); // can't assign a value from a void function.
}
void getInput(int *p)
{
  // assumes you're going to get input for individual array elements
  int i;

  for (i = 0; i < maxNum; i++)
    p[i] = someValue; // assign a value however you want.
}

 

[Salem]

getValues just does

getInput(l);

--

 

[SlykFX]

the "*l = getInput(???);" line in my first post was a typo - mixed to functions together
when copying it to here - sorry for the confusion


ive just changed my code to match

int main(void)
{
  int location[maxNum];
  getValues(location);
}
void getValues(int *l)
{
  getInput(l);
  // has error checking and other function calls in this here
}
void getInput(int *p)
{
  // gets values to populate the array
}

however im still receiving the same error

cc: Warning: part2.c, line 309: In this declaration, the type of the
function "getInput" is not compatible with the earlier implicit declar
ation of "getInput" at line number 223 in file part2.c. (no
tcompatimp)
void getInput(int *l)
-----^

ive checked everything i can think of concerning the function and its call but cant see anything wrong with it
and yes the prototype is good

I can't be bothered to have a sig!

 

[itsgsd]

An implicit declaration results when you use a function before it's declaration. You need to either declare the function before it's use, or even better, prototype your functions, either in a header file that you then include, or at the beginning of your code, right after any includes.

#include <stdio.h>
#include <stdlib.h>
#include <whateverElse.h>

void getInput(int *p); // these are the function prototypes
void getValues(int *l);

int main(void)
{
  int location[maxNum];
  getValues(location);
}
void getValues(int *l)
{
  getInput(l);
  // has error checking and other function calls in this here
}
void getInput(int *p)
{
  // gets values to populate the array
}

 

[SlykFX]

the prototype is fine

however ive just noticed the problem anyway
i had used an upper case i not an l in my spelling of the function
the difference between I and l (uppercase i and lowercase L) is only minor at the best of times

sorry about this guys, i guess i am alot tireder than i thought

but thanks anyway as it did confirm what i needed to check

I can't be bothered to have a sig!