True/False

Bolong Yu (69)
What is the boolean value of each statement?

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int i = 4;
	int j = 3;
	bool true_false;
true_false = (j<4);
	true_false = (j<3);
	true_false = (j< 1);
	true_false = (i< 4);
	true_false = (j <=4);
	true_false = (4> 4);
	true_false = (i != j);
	true_false = (i == j || < 100);
	true_false = ( i == j && i < 100 );
	true_false = ( i < j || true_false && j >= 3);
	true_false = ( ! ( i > 2 && j == 4);
	true_false = !1;
Last edited on
usandfriends (273)
What is 'i' and what is 'j'?
Bolong Yu (69)
int i = 4;
int j = 3;
bool true_false;
whitenite1 (799)
@Bolong Yu

You can easily find the answers to your program, by adding a cout, of the true_false assignments.

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#include <iostream>

using namespace std;

int main()
{
        int i = 4;
	int j = 3;
	bool true_false;
	true_false = (j<4);cout << true_false << endl;
	true_false = (j<4);cout << true_false << endl; 
	true_false = (j<3);cout << true_false << endl;
	true_false = (j< 1);cout << true_false << endl;
	true_false = (i< 4);cout << true_false << endl;
	true_false = (j <=4);cout << true_false << endl;
	true_false = (4> 4);cout << true_false << endl;
	true_false = (i != j);cout << true_false << endl;
	true_false = (i == j || i < 100);cout << true_false << endl;
	true_false = ( i == j && i < 100 );cout << true_false << endl; // added the 'i' before <100
	true_false = ( i < j || true_false && j >= 3);cout << true_false << endl;
	true_false = ( ! ( i > 2 && j == 4));cout << true_false << endl;// Needed another ) to balance parentheses
	true_false = !1;cout << true_false << endl;
	return 0;
}
usandfriends (273)
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#include <iostream>

using namespace std;

int main()
{
        int i = 4;
	int j = 3;
	bool true_false;
	true_false = (j<4);if(true_false==1){cout<<"true"<<endl;}else{cout<<"false"<<endl;}
	true_false = (j<4);if(true_false==1){cout<<"true"<<endl;}else{cout<<"false"<<endl;}
	true_false = (j<3);if(true_false==1){cout<<"true"<<endl;}else{cout<<"false"<<endl;}
	true_false = (j< 1);if(true_false==1){cout<<"true"<<endl;}else{cout<<"false"<<endl;}
	true_false = (i< 4);if(true_false==1){cout<<"true"<<endl;}else{cout<<"false"<<endl;}
	true_false = (j <=4);if(true_false==1){cout<<"true"<<endl;}else{cout<<"false"<<endl;}
	true_false = (4> 4);if(true_false==1){cout<<"true"<<endl;}else{cout<<"false"<<endl;}
	true_false = (i != j);if(true_false==1){cout<<"true"<<endl;}else{cout<<"false"<<endl;}
	true_false = (i == j || i < 100);if(true_false==1){cout<<"true"<<endl;}else{cout<<"false"<<endl;}
	true_false = ( i == j && i < 100 );if(true_false==1){cout<<"true"<<endl;}else{cout<<"false"<<endl;} // added the 'i' before <100
	true_false = ( i < j || true_false && j >= 3);if(true_false==1){cout<<"true"<<endl;}else{cout<<"false"<<endl;}
	true_false = ( ! ( i > 2 && j == 4));if(true_false==1){cout<<"true"<<endl;}else{cout<<"false"<<endl;}// Needed another ) to balance parentheses
	true_false = !1;if(true_false==1){cout<<"true"<<endl;}else{cout<<"false"<<endl;}
	return 0;
}


Again, whitenite beat me to it, but I made the code a little more user-friendly.
modoran (1400)
How about std::boolalpha in your cout statements ?
http://www.cplusplus.com/reference/ios/boolalpha/
usandfriends (273)
modoran wrote:
How about std::boolalpha in your cout statements ?
http://www.cplusplus.com/reference/ios/boolalpha/

Here you go!

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#include <iostream>

using namespace std;

int main()
{
        int i = 4;
	int j = 3;
	bool true_false;
	true_false = (j<4);cout << boolalpha << true_false << endl;
	true_false = (j<4);cout << boolalpha << true_false << endl; 
	true_false = (j<3);cout << boolalpha << true_false << endl;
	true_false = (j< 1);cout << boolalpha << true_false << endl;
	true_false = (i< 4);cout << boolalpha << true_false << endl;
	true_false = (j <=4);cout << boolalpha << true_false << endl;
	true_false = (4> 4);cout << boolalpha << true_false << endl;
	true_false = (i != j);cout << boolalpha << true_false << endl;
	true_false = (i == j || i < 100);cout << boolalpha << true_false << endl;
	true_false = ( i == j && i < 100 );cout << boolalpha << true_false << endl; // added the 'i' before <100
	true_false = ( i < j || true_false && j >= 3);cout << boolalpha << true_false << endl;
	true_false = ( ! ( i > 2 && j == 4));cout << boolalpha << true_false << endl;// Needed another ) to balance parentheses
	true_false = !1;cout << boolalpha << true_false << endl;
	return 0;
}


That's something I was looking for. Thanks modoran!
Last edited on
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