Pointers - C Questions
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Memory Allocation - 1 Memory Allocation - 2The ones who are crazy enough to think they can change the world are the ones who do.- Steve Jobs
Functions Tricky Interview Questions and Answers
In most of the MNC interview questions such as in ZOHO interview question, IVTL Infoview interview questions, Amazon interview questions, GOOGLE interview questions, Infosys interview questions and even in Voonik interview questions, We come across several Tricky C Questions about which 2:5 of the questions are from Functions in c. Solving that kind of tricky C questions is not an easy task for all C programmers. We need more practices to solve it with ease. So we provide 25+ interesting C questions in Functions to make your MNC interview very easy.
C Functions Questions
21. What will be the output of the C program?
#include<stdio.h>
int main()
{
int *ptr = fun();
printf("%d", *ptr);
return 0;
}
int fun()
{
int num = 10;
return num;
}
x
Option: C
Explanation
*ptr doesn't have any address to display its value because ptr itself contains a value 10 and not an address.
22. What will be the output of the C program?
#include<stdio.h>
int main()
{
char str1[] = {'H', 'A', 'I'};
char str2[] = {'H', 'A', 'I'};
if (strcmp(str1, str2))
{
printf("strings are not equal");
}
else
{
printf("strings are equal");
}
return 0;
}
x
Option: A
Explanation
strcmp() is an inbuilt c function, which returns zero when both strings are equal. Thus else part is executed and outputted strings are not equal
23. What will be the output of the C program?
#include<stdio.h>
int main()
{
void swap();
int x = 5, y = 10;
swap(&x, &y);
printf("x = %d y = %d",x,y);
return 0;
}
void swap(int *a, int *b)
{
*a ^= *b, *b ^= *a, *a ^= *b;
}
x
Option: C
Explanation
swap( &x, &y ); clearly its a call by reference, which means any changes made to formal parameter will affect the actual parameter.
Thus by swapping the values of a and b inside the function will so affect the values stored in a variable x and y.
24. What will be the output of the C program?
#include<stdio.h>
int main()
{
int i;
i = main();
printf("%d", i);
int main()
{
int a;
a = 5 * 5;
return a;
}
return 0;
}
x
Option: B
Explanation
main(); function is called repeatedly and the program never ends until your system memory crash.
25. What will be the output of the C program?
#include<stdio.h>
int swap(int *a, int *b)
{
*a = *a + *b;
*b = *a - *b;
*a = *a - *b;
}
int main()
{
int x = 5, y = 10;
swap(&x, &y);
printf("%d %d\n", x, y);
return 0;
}
x
Option: C
Explanation
Simply we passes address of x and y to the function swap( int *a, int *b ) and the value stored inside the address of x and y is accessed by the pointer variable *a and *b.
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