Is there a difference between "if" and "&&"？

[helloea]

double

 MathematicalAchievement = 

90

 ; 


double

 ScoreOfChinese = 

80

 ; 


void  

OnStart

（）


  { 
   

if

（MathematicalAchievement> 

90

 && ScoreOfChinese> 

90

）


     { 
      

Print

（

“VeryGood”

）; 


     } 


  }

double

 MathematicalAchievement = 

90

 ; 


double

 ScoreOfChinese = 

80

 ; 


void  

OnStart

（）


  { 
   

if

（MathematicalAchievement> 

90

）


     { 
     

if

（ScoreOfChinese> 

90

）


     { 
      

Print

（

“VeryGood”

）; 


      } 


     } 


  }

Are these two expressions the same?

[Icham Aidibe]

In the first one, you are using 2 conditions (Mathematical&&Scoreofchinese) with ONE "if" statement. 

In the second one, you're first looking to confirm a first condition (Mathematical) in a if statetement, before confirming the second one (Scoreofchinese) with a second statement. 

Same result. You would choose one over the other depending on your need. Be sure to read also about the "||" (OR)

[helloea]

Icham Aidibe:

In the first one, you are using 2 conditions (Mathematical&&Scoreofchinese) with ONE "if" statement. 

In the second one, you're first looking to confirm a first condition (Mathematical) in a if statetement, before confirming the second one (Scoreofchinese) with a second statement. 

Same result. You would choose one over the other depending on your need. Be sure to read also about the "||" (OR)

wow!Programming is really detail-oriented work!If you don't say it, I can't understand it!

[William Roeder]

Same since Build 600 and Higher. 2014.02.03

[helloea]

William Roeder:
Same since Build 600 and Higher. 20 14.02.03

Hello, how should I understand?

[lippmaje]

William Roeder:
Same since Build 600 and Higher. 2014.02.03

How was if(a) if(b) Print("true") ever different from if(a&&b) Print("true") ?

[Seng Joo Thio]

lippmaje:
How was if(a) if(b) Print("true") ever different from if(a&&b) Print("true") ?

Before Build 600, both 'a' and 'b' are evaluated in 'if(a&&b)' regardless of 'a' being true or false - so if you have 'if(a>0 && b/a>4)', you'll crash when 'a'==0...

[Icham Aidibe]

helloea:

wow!Programming is really detail-oriented work!If you don't say it, I can't understand it!

Sure you would have understand after few experimentation.

[helloea]

Seng Joo Thio:

Before Build 600, both 'a' and 'b' are evaluated in 'if(a&&b)' regardless of 'a' being true or false - so if you have 'if(a>0 && b/a>4)', you'll crash when 'a'==0...

Did you know that from reading the documentation?An experiment?Or somewhere else?

[Seng Joo Thio]

helloea:

Did you know that from reading the documentation?An experiment?Or somewhere else?

From here: https://docs.mql4.com/mql4changes

[helloea]

Seng Joo Thio:

From here: https://docs.mql4.com/mql4changes

You have a lot of knowledge.