pointer help

[mouse666666]

i need help with pointer iam just starting out can someone hep me. my program doesnt run

[

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

int f(int a, int b);
main()
{
      int a=2,b=4;
      int t;      
      
   t=  f(&a,&b);
     
     printf("%i %i",a,b);
     getchar(); 

}
int f(int *a, int *b)
{
    int t;
   a=5;
   b=10;
   t=a+b;
   return t;
     
}

[Char*Pntr]

EDIT:

Arghhh! I screwed this up again! See cph's answer, it's better than mine.
At least I got the de-reference part right.

[cph]

#include <stdio.h>

void func (int *pa, int *pb)
{
    int tmp = *pa;

    *pa = *pb;
    *pb = tmp;
}

int main (void)
{
    int a = 2, b = 4;

    printf("%i %i\n", a, b);
    func(&a, &b);
    printf("%i %i\n", a, b);

    return(0);
}

[laserlight]

i need help with pointer iam just starting out can someone hep me. my program doesnt run

What is your program supposed to do in the first place?

[Syscal]

Apparently swap two variables.

[Char*Pntr]

i need help with pointer iam just starting out can someone hep me. my program doesnt run

[

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

int f(int a, int b);
main()
{
      int a=2,b=4;
      int t;      
      
   t=  f(&a,&b);
     
     printf("%i %i",a,b);
     getchar(); 

}
int f(int *a, int *b)
{
    int t;
   a=5;
   b=10;
   t=a+b;
   return t;
     
}

I take back what I said in my edit. The solution provided may work, but it also completely
rewrote his function.

Re-writing his code will not help him to learn, especially in this case when there
was a very simple solution.

[laserlight]

Apparently swap two variables.

I suspect that "assign 5 and 10 to a and b in main from f and then print a and b in main" is more likely to be the answer. The fix I would then suggest is to dereference a and b in f. Still, we should wait and see what mouse666666 really had in mind.

Incidentally, mouse666666: you should explicitly declare the main function as returning an int, and then return 0 at its end (optional in C99). It looks like you do not need the non-standard <conio.h> at all. Your indentation could be improved; look at cph's example in post #3 for inspiration.

[Syscal]

Woops, I was reading cph's code, not the OP's. To fix his code:

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

int f(int *a, int *b);
int main(){

    int a=2,b=4, t;

    t = f(&a,&b);

    printf("%i %i",a,b);
    getchar();

    return 0;

}
int f(int *a, int *b){
  
   int t;

   *a=5;
   *b=10;
   t = *a + *b;

   return t;
}

OP: Your prototype wasn't the same as the formal parameters at the bottom. Also, you weren't dereferencing the pointers in your function.

[cph]

I take back what I said in my edit. The solution provided may work, but it also completely
rewrote his function.

Re-writing his code will not help him to learn, especially in this case when there
was a very simple solution.

I'm sure I was only providing the hint to mouse666666 (I hope I didn't overdo the hint )