C Programming - Functions - Discussion

Let a = 15 and b = 16.

Return (b = a+b, b);

Value return will be 31.

This may clear the left to right associativity of operator.

return (kk, ll) is not possible as 2 values cannot be returned. So, the accumulator value is taken which is 12.

For both k and l it happens therefore the o/p is 1212. (just an assumption referring previous questions).

12 12 how it is possible please help me?

@Ravindra.

A sufficient one Ravindra :-).

Function returns values even in following two cases.

1) return a, return b;

2) return (2, 4);

If function return more then one value to only one L value then right argument will be taken,

Ex:
a=func();

And,
func{
-----------
-------
return (c,b);
}

Then a==b.

Explanation:

Step 1: int i=3, j=4, k, l; The variables i, j, k, l are declared as an integer type and variable i, j are initialized to 3, 4 respectively.

The function addmult(i, j); accept 2 integer parameters.

Step 2: k = addmult(i, j); becomes k = addmult(3, 4)

In the function addmult(). The variable kk, ll are declared as an integer type int kk, ll;

kk = ii + jj; becomes kk = 3 + 4 Now the kk value is '7'.

ll = ii * jj; becomes ll = 3 * 4 Now the ll value is '12'.

return(kk, ll); It returns the value of variable ll only.

The value 12 is stored in variable 'k'.

Step 3: l = addmult(i, j); becomes l = addmult(3, 4)

kk = ii + jj; becomes kk = 3 + 4 Now the kk value is '7'.

ll = ii * jj; becomes ll = 3 * 4 Now the ll value is '12'.

return(kk, ll); It returns the value of variable ll only.

The value 12 is stored in variable 'l'.

Step 4: printf("%d, %d\n", k, l); It prints the value of k and l.

Hence the output is - 12, 12

I think the answer should be compile error. Because the function return two values at a time which is not possible.

Can anyone explain me the concept ?

LL is only returning values for both variables because KK is being overwritten by LL.

Had there been only "kk" being returned 'addmult()' would return only '7'
but since two different computations are being returned the greater value (i.e. 12)is overriding the smaller value(i.e. 7) and so the result of the both the computations stored in k and l respectively are turning out be 12.