Const

Q1:
What will be the output of the program?
#include<stdio.h>
int fun(int **ptr);

int main()
{
    int i=10;
    const int *ptr = &i;
    fun(&ptr);
    return 0;
}
int fun(int **ptr)
{
    int j = 223;
    int *temp = &j;
    printf('Before changing ptr = %5x\n', *ptr);
    const *ptr = temp;
    printf('After changing ptr = %5x\n', *ptr);
    return 0;
}

A Address of i
Address of j

B 10
223

C Error: cannot convert parameter 1 from 'const int **' to 'int **'

D Garbage value

Q2:
What will be the output of the program?
#include<stdio.h>

int main()
{
    const char *s = '';
    char str[] = 'Hello';
    s = str;
    while(*s)
        printf('%c', *s++);

    return 0;
}

A Error

B H

C Hello

D Hel

Q3:
What will be the output of the program?
#include<stdio.h>

int main()
{
    const c = -11;
    const int d = 34;
    printf('%d, %d\n', c, d);
    return 0;
}

A Error

B -11, 34

C 11, 34

D None of these

Q4:
What will be the output of the program?
#include<stdio.h>

int main()
{
    const int x=5;
    const int *ptrx;
    ptrx = &x;
    *ptrx = 10;
    printf('%d\n', x);
    return 0;
}

A 5

B 10

C Error

D Garbage value

Q5:
What will be the output of the program?
#include<stdio.h>
int get();

int main()
{
    const int x = get();
    printf('%d', x);
    return 0;
}
int get()
{
    return 20;
}

A Garbage value

B Error

C 20

D 0

Q6:
What will be the output of the program?
#include<stdio.h>
#include<stdlib.h>

union employee
{
    char name[15];
    int age;
    float salary;
};
const union employee e1;

int main()
{
    strcpy(e1.name, 'K');
    printf('%s %d %f', e1.name, e1.age, e1.salary);
    return 0;
}

A Error: RValue required

B Error: cannot convert from 'const int *' to 'int *const'

C Error: LValue required in strcpy

D No error

Q7:
What will be the output of the program?
#include<stdio.h>

int main()
{
    const int i=0;
    printf('%d\n', i++);
    return 0;
}

A 10

B 11

C No output

D Error: ++needs a value

Q8:
What will be the output of the program in TurboC?
#include<stdio.h>
int fun(int **ptr);

int main()
{
    int i=10, j=20;
    const int *ptr = &i;
    printf(' i = %5X', ptr);
    printf(' ptr = %d', *ptr);
    ptr = &j;
    printf(' j = %5X', ptr);
    printf(' ptr = %d', *ptr);
    return 0;
}

A i= FFE2 ptr=12 j=FFE4 ptr=24

B i= FFE4 ptr=10 j=FFE2 ptr=20

C i= FFE0 ptr=20 j=FFE1 ptr=30

D Garbage value

Q9:
What will be the output of the program?
#include<stdio.h>

int main()
{
    int y=128;
    const int x=y;
    printf('%d\n', x);
    return 0;
}

A 128

B Garbage value

C Error

D 0

Q10:
What will be the output of the program (in Turbo C)?
#include<stdio.h>

int fun(int *f)
{
    *f = 10;
    return 0;
}
int main()
{
    const int arr[5] = {1, 2, 3, 4, 5};
    printf('Before modification arr[3] = %d', arr[3]);
    fun(&arr[3]);
    printf('\nAfter modification arr[3] = %d', arr[3]);
    return 0;
}

A Before modification arr[3] = 4
After modification arr[3] = 10

B Error: cannot convert parameter 1 from const int * to int *

C Error: Invalid parameter

D Before modification arr[3] = 4
After modification arr[3] = 4


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