GATE Computer Science (CS) 2017 Shift 1 Solved Paper

Question : 23 of 65

Marks: +1, -0


#include <stdio.h>
int *assignval(int *x, int val) {
*x = val;
return x;
}
void main () {
int *x = malloc(sizeof(int));
if (NULL == x) return;
x = assignval (x, 0);
if (x) {
x = (int *) malloc (sizeof(int));
if(NULL == x) return;
x = assignval (x, 10);
}
printf(“%d\n”, *x);
free(x);
}

The code suffers from which one of the following problems:

Compiler error as the return of malloc is not typecast appropriately
Compiler error because the comparison should be made as x == NULL and not as shown
Compiles successfully but execution may result in dangling pointer
Compiles successfully but execution may result in memory leak

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