C++ programming basic input, output, data types, declaration Aptitude Questions and Answers

#include <.....>
int main()
{
	cout<<"Hello World.";
	return 0;
}    
    

1. stdio.h
2. conio.h
3. iostream.h
4. ostream.h

#include <iostream.h>
int main()
{
	int age=19;
	.....
	return 0;
}
    

1. cout << "Age: %d",age;
2. cout << "Age: %d" << age;
3. cout << "Age: " + age;
4. cout << "Age: " << age;

#include <iostream.h>
int a=10;
int main()
{
	int a=20;
	cout<<::a;
	return 0;
}
    

1. 10
2. 20
3. ::10
4. ::20

1. Both are same.
2. '\n' and endl both are used to print new line but endl flushes the buffer after printing new line.
3. '\n' and endl both are used to print new line but '\n' flushes the buffer after printing new line.
4. '\n' used in C programming while endl used in C++ programming.

1. conio.h
2. iostream.h
3. stdlib.h
4. iomanip.h

1. To set width of the variable in memory.
2. To pad the value with space or any defined special character of next variable.
3. To set the white spaces in the input buffer.
4. None of these.

#include >iostream>

using namespace std;

int main()
{
   cout <<P"includehelp.com";
   
   return 0;
}
    

1. Compile Time Error
2. Run Time Error
3. includehelp.com
4. None of these.

main.cpp:7:11: error: 'P' was not declared in this scope
cout <<P"includehelp.com";
       ^