C | Pointer Basics | Question 1
What is the output of following program?
# include <stdio.h>
void fun( int x)
{
x = 30;
}
int main()
{
int y = 20;
fun(y);
printf ( "%d" , y);
return 0;
}
|
(A) 30
(B) 20
(C) Compiler Error
(D) Runtime Error
Answer: (B)
Explanation: Parameters are always passed by value in C. Therefore, in the above code, value of y is not modified using the function fun(). So how do we modify the value of a local variable of a function inside another function. Pointer is the solution to such problems. Using pointers, we can modify a local variable of a function inside another function. See the next question.
Note that everything is passed by value in C. We only get the effect of pass by reference using pointers.
Last Updated :
04 Feb, 2013
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