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Why is NodeJS not calculating the value?

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0

I am trying to get this simple console Node.js calculator to work, but it just won't return any value. Any insight into what I'm doing wrong?

 console.log(process.argv);
var x = 0;
if (process.argv[4]==="+"||process.argv[4]==="plus")x=parseInt(process.argv[3])+parseInt(process.argv[5])
if (process.argv[4]==="-"||process.argv[4]==="minus")x=parseInt(process.argv[3])-parseInt(process.argv[5])
if (process.argv[4]==="*"||process.argv[4]==="times")x=parseInt(process.argv[3])*parseInt(process.argv[5])
if (process.argv[4]==="/"||process.argv[4]==="over")x=parseInt(process.argv[3])/parseInt(process.argv[5])
console.log(x);

node.js

share|improve this question

asked Mar 26 at 3:38

OlegArsyonovOlegArsyonov

46811 gold badge44 silver badges1414 bronze badges

add a comment | 

0

I am trying to get this simple console Node.js calculator to work, but it just won't return any value. Any insight into what I'm doing wrong?

 console.log(process.argv);
var x = 0;
if (process.argv[4]==="+"||process.argv[4]==="plus")x=parseInt(process.argv[3])+parseInt(process.argv[5])
if (process.argv[4]==="-"||process.argv[4]==="minus")x=parseInt(process.argv[3])-parseInt(process.argv[5])
if (process.argv[4]==="*"||process.argv[4]==="times")x=parseInt(process.argv[3])*parseInt(process.argv[5])
if (process.argv[4]==="/"||process.argv[4]==="over")x=parseInt(process.argv[3])/parseInt(process.argv[5])
console.log(x);

node.js

share|improve this question

asked Mar 26 at 3:38

OlegArsyonovOlegArsyonov

46811 gold badge44 silver badges1414 bronze badges

add a comment | 

I am trying to get this simple console Node.js calculator to work, but it just won't return any value. Any insight into what I'm doing wrong?

 console.log(process.argv);
var x = 0;
if (process.argv[4]==="+"||process.argv[4]==="plus")x=parseInt(process.argv[3])+parseInt(process.argv[5])
if (process.argv[4]==="-"||process.argv[4]==="minus")x=parseInt(process.argv[3])-parseInt(process.argv[5])
if (process.argv[4]==="*"||process.argv[4]==="times")x=parseInt(process.argv[3])*parseInt(process.argv[5])
if (process.argv[4]==="/"||process.argv[4]==="over")x=parseInt(process.argv[3])/parseInt(process.argv[5])
console.log(x);

node.js

share|improve this question

asked Mar 26 at 3:38

OlegArsyonovOlegArsyonov

46811 gold badge44 silver badges1414 bronze badges

 console.log(process.argv);
var x = 0;
if (process.argv[4]==="+"||process.argv[4]==="plus")x=parseInt(process.argv[3])+parseInt(process.argv[5])
if (process.argv[4]==="-"||process.argv[4]==="minus")x=parseInt(process.argv[3])-parseInt(process.argv[5])
if (process.argv[4]==="*"||process.argv[4]==="times")x=parseInt(process.argv[3])*parseInt(process.argv[5])
if (process.argv[4]==="/"||process.argv[4]==="over")x=parseInt(process.argv[3])/parseInt(process.argv[5])
console.log(x);

share|improve this question

asked Mar 26 at 3:38

OlegArsyonovOlegArsyonov

46811 gold badge44 silver badges1414 bronze badges

share|improve this question

asked Mar 26 at 3:38

OlegArsyonovOlegArsyonov

46811 gold badge44 silver badges1414 bronze badges

asked Mar 26 at 3:38

OlegArsyonovOlegArsyonov

46811 gold badge44 silver badges1414 bronze badges

asked Mar 26 at 3:38

OlegArsyonovOlegArsyonov

46811 gold badge44 silver badges1414 bronze badges

1 Answer
1

active

oldest

votes

1

The array indexing on Javascript starts from 0 and not 1. Also it is best to handle divide by zero condition.

console.log(process.argv);
var x = 0;
if (process.argv[3] === "+" || process.argv[3] === "plus") 
 x = parseInt(process.argv[2]) + parseInt(process.argv[4]);

if (process.argv[3] === "-" || process.argv[3] === "minus") 
 x = parseInt(process.argv[2]) - parseInt(process.argv[4]);

if (process.argv[3] === "*" || process.argv[3] === "times") 
 x = parseInt(process.argv[2]) * parseInt(process.argv[4]);

if (process.argv[3] === "/" || process.argv[3] === "over") 
 x = parseInt(process.argv[2]) / parseInt(process.argv[4]);

console.log(x);

share|improve this answer

answered Mar 26 at 3:46

PrivateOmegaPrivateOmega

1,24766 silver badges1818 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you. I should have thought about it!
  
  – OlegArsyonov
  Mar 26 at 3:49
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @OlegArsyonov, did this solve your problem? If yes, kindly accept the answer. Else, state what else or more is needed.
  
  – Rai
  Mar 26 at 5:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @OlegArsyonov instead of all if statements, use if, else if ..... that will be a little more efficient.
  
  – Pankaj Jindal
  Mar 26 at 5:53
  

  
  
  
  

add a comment | 

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1

The array indexing on Javascript starts from 0 and not 1. Also it is best to handle divide by zero condition.

console.log(process.argv);
var x = 0;
if (process.argv[3] === "+" || process.argv[3] === "plus") 
 x = parseInt(process.argv[2]) + parseInt(process.argv[4]);

if (process.argv[3] === "-" || process.argv[3] === "minus") 
 x = parseInt(process.argv[2]) - parseInt(process.argv[4]);

if (process.argv[3] === "*" || process.argv[3] === "times") 
 x = parseInt(process.argv[2]) * parseInt(process.argv[4]);

if (process.argv[3] === "/" || process.argv[3] === "over") 
 x = parseInt(process.argv[2]) / parseInt(process.argv[4]);

console.log(x);

share|improve this answer

answered Mar 26 at 3:46

PrivateOmegaPrivateOmega

1,24766 silver badges1818 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you. I should have thought about it!
  
  – OlegArsyonov
  Mar 26 at 3:49
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @OlegArsyonov, did this solve your problem? If yes, kindly accept the answer. Else, state what else or more is needed.
  
  – Rai
  Mar 26 at 5:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @OlegArsyonov instead of all if statements, use if, else if ..... that will be a little more efficient.
  
  – Pankaj Jindal
  Mar 26 at 5:53
  

  
  
  
  

add a comment | 

1

The array indexing on Javascript starts from 0 and not 1. Also it is best to handle divide by zero condition.

console.log(process.argv);
var x = 0;
if (process.argv[3] === "+" || process.argv[3] === "plus") 
 x = parseInt(process.argv[2]) + parseInt(process.argv[4]);

if (process.argv[3] === "-" || process.argv[3] === "minus") 
 x = parseInt(process.argv[2]) - parseInt(process.argv[4]);

if (process.argv[3] === "*" || process.argv[3] === "times") 
 x = parseInt(process.argv[2]) * parseInt(process.argv[4]);

if (process.argv[3] === "/" || process.argv[3] === "over") 
 x = parseInt(process.argv[2]) / parseInt(process.argv[4]);

console.log(x);

share|improve this answer

answered Mar 26 at 3:46

PrivateOmegaPrivateOmega

1,24766 silver badges1818 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you. I should have thought about it!
  
  – OlegArsyonov
  Mar 26 at 3:49
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @OlegArsyonov, did this solve your problem? If yes, kindly accept the answer. Else, state what else or more is needed.
  
  – Rai
  Mar 26 at 5:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @OlegArsyonov instead of all if statements, use if, else if ..... that will be a little more efficient.
  
  – Pankaj Jindal
  Mar 26 at 5:53
  

  
  
  
  

add a comment | 

The array indexing on Javascript starts from 0 and not 1. Also it is best to handle divide by zero condition.

console.log(process.argv);
var x = 0;
if (process.argv[3] === "+" || process.argv[3] === "plus") 
 x = parseInt(process.argv[2]) + parseInt(process.argv[4]);

if (process.argv[3] === "-" || process.argv[3] === "minus") 
 x = parseInt(process.argv[2]) - parseInt(process.argv[4]);

if (process.argv[3] === "*" || process.argv[3] === "times") 
 x = parseInt(process.argv[2]) * parseInt(process.argv[4]);

if (process.argv[3] === "/" || process.argv[3] === "over") 
 x = parseInt(process.argv[2]) / parseInt(process.argv[4]);

console.log(x);

share|improve this answer

answered Mar 26 at 3:46

PrivateOmegaPrivateOmega

1,24766 silver badges1818 bronze badges

console.log(process.argv);
var x = 0;
if (process.argv[3] === "+" || process.argv[3] === "plus") 
 x = parseInt(process.argv[2]) + parseInt(process.argv[4]);

if (process.argv[3] === "-" || process.argv[3] === "minus") 
 x = parseInt(process.argv[2]) - parseInt(process.argv[4]);

if (process.argv[3] === "*" || process.argv[3] === "times") 
 x = parseInt(process.argv[2]) * parseInt(process.argv[4]);

if (process.argv[3] === "/" || process.argv[3] === "over") 
 x = parseInt(process.argv[2]) / parseInt(process.argv[4]);

console.log(x);

share|improve this answer

answered Mar 26 at 3:46

PrivateOmegaPrivateOmega

1,24766 silver badges1818 bronze badges

answered Mar 26 at 3:46

PrivateOmegaPrivateOmega

1,24766 silver badges1818 bronze badges

answered Mar 26 at 3:46

PrivateOmegaPrivateOmega

1,24766 silver badges1818 bronze badges