Pointer to functions

Which function is not called in the following C program?
#include <stdio.h>
void first()
{
printf("first");
}
void second()
{
first();
}
void third()
{
second();
}
void main()
{
void (*ptr)();
ptr = third;
ptr();
}
1. Function first
2. Function second
3. Function third
4. None of the mentioned
How to call a function without using the function name to send parameters?
1. typedefs
2. Function pointer
3. Both typedefs and Function pointer
4. None of the mentioned
Which of the following is a correct syntax to pass a Function Pointer as an argument?
1. void pass(int (*fptr)(int, float, char)){}
2. void pass(*fptr(int, float, char)){}
3. void pass(int (*fptr)){}
4. void pass(*fptr){}
Which of the following is not possible in C?
1. Array of function pointer
2. Returning a function pointer
3. Comparison of function pointer
4. None of the mentioned
What will be the output of the following C code?

#include <stdio.h>
void first()
{
printf("Hello World");
}
void main()
{
void *ptr() = first;
ptr++
ptr();
}
1. Illegal application of ++ to void data type
2. pointer function initialized like a variable
3. Illegal application of ++ to void data type & pointer function initialized like a variable
4. None of the mentioned
What will be the output of the following C code?
#include <stdio.h>
int mul(int a, int b, int c)
{
return a * b * c;
}
void main()
{
int (*function_pointer)(int, int, int);
function_pointer = mul;
printf("The product of three numbers is:%d",
function_pointer(2, 3, 4));
}
1. The product of three numbers is:24
2. Run time error
3. Nothing
4. Varies
What will be the output of the following C code?

#include <stdio.h>
int mul(int a, int b, int c)
{
return a * b * c;
}
void main()
{
int (function_pointer)(int, int, int);
function_pointer = mul;
printf("The product of three numbers is:%d",
function_pointer(2, 3, 4));
}
1. The product of three numbers is:24
2. Compile time error
3. Nothing
4. Varies
What will be the output of the following C code?

#include <stdio.h>
void f(int (*x)(int));
int myfoo(int);
int (*fooptr)(int);
int ((*foo(int)))(int);
int main()
{
fooptr = foo(0);
fooptr(10);
}
int ((*foo(int i)))(int)
{
return myfoo;
}
int myfoo(int i)
{
printf("%d\n", i + 1);
}
1. 10
2. 11
3. Compile time error
4. Undefined behaviour
What will be the output of the following C code?
#include <stdio.h>
int mul(int a, int b, int c)
{
return a * b * c;
}
void main()
{
int *function_pointer;
function_pointer = mul;
printf("The product of three numbers is:%d",
function_pointer(2, 3, 4));
}
1. The product of three numbers is:24
2. Compile time error
3. Nothing
4. Varies
What will be the output of the following C code?

#include <stdio.h>
int sub(int a, int b, int c)
{
return a - b - c;
}
void main()
{
int (*function_pointer)(int, int, int);
function_pointer = ⊂
printf("The difference of three numbers is:%d",
(*function_pointer)(2, 3, 4));
}
1. The difference of three numbers is:1
2. Run time error
3. The difference of three numbers is:-5
4. Varies
One of the uses for function pointers in C is __________
1. Nothing
2. There are no function pointers in c
3. To invoke a function
4. To call a function defined at run-time
What will be the output of the following C code?

#include <stdio.h>
void f(int);
void (*foo)() = f;
int main(int argc, char *argv[])
{
foo(10);
return 0;
}
void f(int i)
{
printf("%d\n", i);
}
1. Compile time error
2. 10
3. Undefined behaviour
4. None of the mentioned
What will be the output of the following C code?

#include <stdio.h>
void f(int);
void (*foo)(void) = f;
int main(int argc, char *argv[])
{
foo(10);
return 0;
}
void f(int i)
{
printf("%d\n", i);
}
1. Compile time error
2. 10
3. Undefined behaviour
4. None of the mentioned
What will be the output of the following C code?

#include <stdio.h>
void f(int);
void (*foo)(float) = f;
int main()
{
foo(10);
}
void f(int i)
{
printf("%d\n", i);
}
1. Compile time error
2. 10
3. 10.000000
4. Undefined behaviour
What will be the output of the following C code?
#include <stdio.h>
void f(int (*x)(int));
int myfoo(int i);
int (*foo)(int) = myfoo;
int main()
{
f(foo(10));
}
void f(int (*i)(int))
{
i(11);
}
int myfoo(int i)
{
printf("%d\n", i);
return i;
}
1. Compile time error
2. Undefined behaviour
3. 10 11
4. 10 Segmentation fault
What will be the output of the following C code?

#include <stdio.h>
void f(int (*x)(int));
int myfoo(int);
int (*foo)() = myfoo;
int main()
{
f(foo);
}
void f(int(*i)(int ))
{
i(11);
}
int myfoo(int i)
{
printf("%d\n", i);
return i;
}
1. 10 11
2. 11
3. 10
4. Undefined behaviour

Pointer to functions

Quiz