Passing pointer to a function

What will be the output of the following C code?
#include <stdio.h>
void foo(int*);
int main()
{
int i = 10;
foo((&i)++);
}
void foo(int *p)
{
printf("%d\n", *p);
}
1. 10
2. Some garbage value
3. Compile time error
4. Segmentation fault/code crash
What will be the output of the following C code?

#include <stdio.h>
void foo(int*);
int main()
{
int i = 10, *p = &i;
foo(p++);
}
void foo(int *p)
{
printf("%d\n", *p);
}
1. 10
2. Some garbage value
3. Compile time error
4. Segmentation fault
What will be the output of the following C code?
#include <stdio.h>
void foo(float *);
int main()
{
int i = 10, *p = &i;
foo(&i);
}
void foo(float *p)
{
printf("%f\n", *p);
}
1. 10.000000
2. 0.000000
3. Compile time error
4. Undefined behaviour
What will be the output of the following C code?

#include <stdio.h>
int main()
{
int i = 97, *p = &i;
foo(&i);
printf("%d ", *p);
}
void foo(int *p)
{
int j = 2;
p = &j;
printf("%d ", *p);
}
1. 2 97
2. 2 2
3. Compile time error
4. Segmentation fault/code crash
What will be the output of the following C code?

#include <stdio.h>
int main()
{
int i = 97, *p = &i;
foo(&p);
printf("%d ", *p);
return 0;
}
void foo(int **p)
{
int j = 2;
*p = &j;
printf("%d ", **p);
}
1. 2 2
2. 2 97
3. Undefined behaviour
4. Segmentation fault/code crash
What will be the output of the following C code?

#include <stdio.h>
int main()
{
int i = 11;
int *p = &i;
foo(&p);
printf("%d ", *p);
}
void foo(int *const *p)
{
int j = 10;
*p = &j;
printf("%d ", **p);
}
1. Compile time error
2. 10 10
3. Undefined behaviour
4. 10 11
What will be the output of the following C code?

#include <stdio.h>
int main()
{
int i = 10;
int *p = &i;
foo(&p);
printf("%d ", *p);
printf("%d ", *p);
}
void foo(int **const p)
{
int j = 11;
*p = &j;
printf("%d ", **p);
}
1. 11 11 11
2. 11 11 Undefined-value
3. Compile time error
4. Segmentation fault/code-crash
What will be the output of the following C code?
#include <stdio.h>
int main()
{
int i = 10;
int *const p = &i;
foo(&p);
printf("%d\n", *p);
}
void foo(int **p)
{
int j = 11;
*p = &j;
printf("%d\n", **p);
}
1. 11 11
2. Undefined behaviour
3. Compile time error
4. Segmentation fault/code-crash
Which of the following is the correct syntax to send an array as a parameter to function?
1. func(&array);
2. func(#array);
3. func(*array);
4. func(array[size]);
Which of the following can never be sent by call-by-value?
1. Variable
2. Array
3. Structures
4. Both Array and Structures
Which type of variables can have the same name in a different function?
1. Global variables
2. Static variables
3. Function arguments
4. Both static variable and function arguments
Arguments that take input by user before running a program are called?
1. Main function arguments
2. Main arguments
3. Command-Line arguments
4. Parameterized arguments
What is the maximum number of arguments that can be passed in a single function?
1. 127
2. 253
3. 361
4. No limits in number od arguments
What will be the output of the following C code?
#include <stdio.h>
void m(int *p, int *q)
{
int temp = *p; *p = *q; *q = temp;
}
void main()
{
int a = 6, b = 5;
m(&a, &b);
printf("%d %d\n", a, b);
}
1. 5 6
2. 6 5
3. 5 5
4. 6 6
vWhat will be the output of the following C code?

#include <stdio.h>
void m(int *p)
{
int i = 0;
for(i = 0;i < 5; i++)
printf("%d\t", p[i]);
}
void main()
{
int a[5] = {6, 5, 3};
m(&a);
}
1. 0 0 0 0 0
2. 6 5 3 0 0
3. Run time error
4. 6 5 3 junk junk
What will be the output of the following C code?

#include <stdio.h>
void m(int p, int q)
{
int temp = p;
p = q;
q = temp;
}
void main()
{
int a = 6, b = 5;
m(a, b);
printf("%d %d\n", a, b);
}
1. 5 6
2. 5 5
3. 6 5
4. 6 6
What will be the output of the following C code?

#include <stdio.h>
void m(int p, int q)
{
printf("%d %d\n", p, q);
}
void main()
{
int a = 6, b = 5;
m(a);
}
1. 6
2. 6 5
3. 6 junk value
4. Compile time error
What will be the output of the following C code?
#include <stdio.h>
int main()
{
char *str = "hello, world\n";
char *strc = "good morning\n";
strcpy(strc, str);
printf("%s\n", strc);
return 0;
}
1. hello, world
2. Crash/segmentation fault
3. Undefined behaviour
4. Run time error
What will be the output of the following C code?

#include <stdio.h>
int main()
{
char *str = "hello world";
char strc[] = "good morning india\n";
strcpy(strc, str);
printf("%s\n", strc);
return 0;
}
1. hello world
2. hello worldg india
3. Compile time error
4. Undefined behaviour
What will be the output of the following C code?
#include <stdio.h>
int main()
{
char *str = "hello, world!!\n";
char strc[] = "good morning\n";
strcpy(strc, str);
printf("%s\n", strc);
return 0;
}
1. hello, world!!
2. Compile time error
3. Undefined behaviour
4. Segmenation fault
What will be the output of the following C code?

#include <stdio.h>
int main()
{
char *str = "hello, world\n";
str[5] = '.';
printf("%s\n", str);
return 0;
}
1. hello. world
2. hello, world
3. Compile error
4. Segmentation fault
What will be the output of the following C code?

#include <stdio.h>
int main()
{
char str[] = "hello, world";
str[5] = '.';
printf("%s\n", str);
return 0;
}
1. hello. world
2. hello, world
3. Compile error
4. Segmentation fault
What will be the output of the following C code?

#include <stdio.h>
int main()
{
char *str = "hello world";
char strary[] = "hello world";
printf("%d %d\n", sizeof(str), sizeof(strary));
return 0;
}
1. 11 11
2. 12 12
3. 4 12
4. 4 11
What will be the output of the following C code?

#include <stdio.h>
int main()
{
char *str = "hello world";
char strary[] = "hello world";
printf("%d %d\n", strlen(str), strlen(strary));
return 0;
}
1. 11 11
2. 12 11
3. 11 12
4. x 11 where x can be any positive integer
What will be the output of the following C code?
1. l
2. e
3. h
4. o
What will be the output of the following C code?

#include <stdio.h>
void fun(char *k)
{
printf("%s", k);
}
void main()
{
char s[] = "hello";
fun(s);
}
1. hello
2. Run time error
3. Nothing
4. h
Comment on the output of the following C code
#include <stdio.h>
int main()
{
char *str = "This" //Line 1
char *ptr = "Program\n"; //Line 2
str = ptr; //Line 3
printf("%s, %s\n", str, ptr); //Line 4
}
1. Memory holding “this” is cleared at line 3
2. Memory holding “this” loses its reference at line 3
3. You cannot assign pointer like in Line 3
4. Output will be This, Program
What type of initialization is needed for the segment “ptr[3] = ‘3’;” to work?
1. char *ptr = “Hello!”;
2. char ptr[] = “Hello!”;
3. both char *ptr = “Hello!”; and char ptr[] = “Hello!”;
4. none of the mentioned
What is the syntax for constant pointer to address (i.e., fixed pointer address)?
1. const *
2. * const
3. const *
4. none of the mentioned
What will be the output of the following C code?

#include <stdio.h>
int add(int a, int b)
{
return a + b;
}
int main()
{
int (*fn_ptr)(int, int);
fn_ptr = add;
printf("The sum of two numbers is: %d", (int)fn_ptr(2, 3));
}
1. Compile time error, declaration of a function inside main
2. Compile time error, no definition of function fn_ptr
3. Compile time error, illegal application of statement fn_ptr = add
4. No Run time error, output is 5
What is the correct way to declare and assign a function pointer?

(Assuming the function to be assigned is "int multi(int, int);")
1. int (*fn_ptr)(int, int) = multi;
2. int *fn_ptr(int, int) = multi;
3. int *fn_ptr(int, int) = &multi;
4. none of the mentioned
Calling a function f with a an array variable a[3] where a is an array, is equivalent to __________
1. f(a[3])
2. f(*(a + 3))
3. f(3[a])
4. all of the mentioned
What will be the output of the following C code?

#include <stdio.h>
void f(char *k)
{
k++;
k[2] = 'm';
}
void main()
{
char s[] = "hello";
f(s);
printf("%c\n", *s);
}
1. h
2. e
3. m
4. o;
What will be the output of the following C code?
#include <stdio.h>
void main()
{
char s[] = "hello";
s++;
printf("%c\n", *s);
}
1. Compile time error
2. h
3. e
4. o

Passing pointer to a function

Quiz