Output of C++ programs | Set 37
Predict the output for the following C++ code:
Question 1
#include <iostream>
int main()
{
if (std::cout << "hello" )
std::cout << " world" ;
else
std::cout << " else part" ;
return 0;
}
|
Output: hello world
Description: Since std::cout<<"hello" returns a reference to std::cout, therefore, the condition gets true, and the if block is executed.
Question 2
#include <iostream>
int main()
{
if (2)
std::cout << "hello" ;
else
std::cout << "world" ;
return 0;
}
|
Output: hello
Description: Since 2 is a non-zero(i.e., true), therefore, the conditions gets true and the if block is executed.
Question 3
#include <iostream>
int main()
{
if (0)
std::cout << "hello" ;
else
std::cout << "world" ;
return 0;
}
|
Output: world
Description: Since 0 is an equivalent of false(in this problem), therefore the conditions gets false and the else block is executed.
Question 4
#include <iostream>
int main()
{
if (NULL)
std::cout << "hello" ;
else
std::cout << "world" ;
return 0;
}
|
Output: world
Description: Since NULL is an equivalent of 0 i.e., false(in this particular problem), therefore the conditions gets false and the else block is executed.
Question 5
#include <iostream>
int main()
{
int n;
if (std::cin >> n) {
std::cout << "hello" ;
} else
std::cout << "world" ;
return 0;
}
|
Input: 100
Output: hello
Description: Since std::cin>>100 returns a reference to std::cin, therefore, the condition gets true, and the if block is executed.
Input: [nothing]
Output: world
Description: Since the input is not provided, the condition becomes false, and hence, the else block is executed.
Last Updated :
10 Feb, 2023
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