-
The output of the following C program is ______.
void f1(int a, int b)
{
int c;
c=a; a=b; b=c;
}
void f2(int *a, int *b)
{
int c;
c=*a; *a=*b; *b=c;
}
int main ()
{
int a=4, b=5, c=6;
f1(a, b);
f2(&b, &c);
printf(“%d”, c–a–b);
}
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- -5
- 4
- 5
- -4
Correct Option: A
In function "main ()"
f1 is called by value, so local variables a, b, c of f1 are customized but not the local variables a, b, c of main function.
f2 is called by reference.
int main () {
int a = 4, b = 5, c = 6
f1(a, b)
f2(&b, &c)
printf ("%d", c-a-b);
}
f2(int *a, int *b)
{
int c;
c = * a; c 5
* a = b; [will change 'b' value of main to c value of main]
*b = c; [will change 'c' value of main to c value of f2]
}
