Default constructor has 

What is the output of the code: printf("\n The number is %06d", 1234);

Which of the following is a User-defined data type?

#include <stdio.h>    

#include <stdlib.h>   

int main ()

{

int n, m;

       n = abs(23);

       m = abs(-11);

printf ("%d", n);

printf ("%d", m);

return 0;

}

#include <bits/stdc++.h>

using namespace std;

void swap(int a,int b){

    int t=a;

    a=b;

    b=t;

}

int main() {

    int a=3,b=4;

    swap(a,b);

    cout<<a<<" "<<b;

return 0;

}

What is the problem in the following declaration?

float 3bedroom;

#include <bits/stdc++.h>

using namespace std;

int main(){

     double a = 21.09399;

     float b = 10.20;

     int c ,d;

     c = (int) a;

     d = (int) b;

     cout << c <<' '<< d;

return 0;

}

realloc() function is used to

 What does the following segment of code do?
fprintf(fp, “Copying!”); 

What is the output of the following C program?

#include <stdio.h>

int main()

{

int a = 10;

switch(a)

{

case 10: printf("Ten"); break;

case 20: printf("Twenty");break;

case 30: printf("Thirty");break;

default: printf("Nothing");

}

return 0;

}