C Online Quiz – Learn the Strategy, Earn the Knowledge

Which of the following is the correct way to declare a function pointer where ‘pointer’ is the pointer to the function and ‘function; is the name of the function

In what way are both declarations different from each other
int display();
extern int display();

Predict the output of the following segment of code:
// ASSUME 64-bit compiler
// Add stdio.h and stdlib.h header file in below code

int main()
{
struct DataFlair
{
int value;
struct DataFlair *link;
};
struct DataFlair *x, *y;
x = (struct DataFlair *) malloc(sizeof(struct DataFlair));
y = (struct DataFlair *) malloc(sizeof(struct DataFlair));
printf(“%ld %ld”,sizeof(x),sizeof(y));
return 0;
}

Which of the following statements is true about structures and unions?

Predict the output of the following segment of code:
// ASSUME 64-bit compiler
// Add stdio.h header file in below code

struct DataFlair
{
int a;
float b;
char array[20];
}d;
int main()
{
printf(“%ld”, sizeof(struct DataFlair));
return 0;
}

Which operator is used to check if a particular bit is on or off?

Predict the output of the following segment of code:If n and p are unsigned int variables in a C program. We wish to set p to nC3. If n is large, which of the following statements is most likely to set p correctly?

Predict the output of the following segment of code:
// Add stdio.h header file in below code

int main()
{
if(sizeof(double) > -1)
printf(“M”);
else
printf(“m”);
return 0;
}

Predict the output of the following segment of code:
// Add stdio.h header file in below code

int main()
{
char result = 125;
result = result + 5;
printf(“%d”, result);
return 0;
}

Out of the following declarations, which one is invalid?