Lesson 11 Source Code

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Lesson 11 Video

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Lesson 11: Introduction to the if statement

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if statements


The if statement will only take bool parameter (value inside the paranthesis).
The if statement will either skip or execute the following program statement depending on the boolean value of the if statement.
Run both of these pieces of code. refer to the video for the detailed explanation.
#include <iostream>
using namespace std;

int main()
{
 if(true)
 cout << "my name is iam4eversmart88" << endl;
 cout << "what is your name";
 cin.get();
 return 0;
}

#include <iostream>
using namespace std;

int main()
{
 if(false)
 cout << "my name is iam4eversmart88" << endl;
 cout << "what is your name";
 cin.get();
 return 0;
}


the if statement can also refer to code blocks (code inside curly braces) to skip multiple lines of code.
#include <iostream>
using namespace std;

int main()
{
 if(false)
 {
  cout << "my name is iam4eversmart88" << endl;
  cout << "what is your name";
 }
 cin.get();
 return 0;
}


you can input variables into th if parameter.
You can also put in int, double, char, etc types but don't forget the rules of the boolean values that aren't true or false.
#include <iostream>
using namespace std;

int main()
{
 bool Boolean=true;
 if(Boolean)
 {
  cout << "my name is iam4eversmart88" << endl;
  cout << "what is your name";
 }
 cin.get();
 return 0;
}


Here are slightly more practical examples that might help you see why if statements are useful
#include <iostream>
using namespace std;

int main()
{
 bool Boolean=true;
 float x=6.1;
 if(Boolean)
 {
  x=999.1;
 }
 cout << x;
 cin.get();
 return 0;
}

#include <iostream>
using namespace std;

int main()
{
 bool Boolean=false;
 float x=6.1;
 if(Boolean)
 {
  x=999.1;
 }
 cout << x;
 cin.get();
 return 0;
}