how to convert string into number code example

Example 1: string to int c

atoi(str) is unsafe

This is the prefered method:
(int)strtol(str, (char **)NULL, 10)

Example 2: how to change a string to number in javascript

let theInt = parseInt("5.90123"); //5
let theFloat = parseFloat("5.90123"); //5.90123

Example 3: string to number js

let myNumber = Number("5.25"); //5.25

Example 4: javascript convert string to number

var myInt = parseInt("10.256"); //10
var myFloat = parseFloat("10.256"); //10.256

Example 5: string to int javascript

var text = '42px';
var integer = parseInt(text, 10);
// returns 42

Example 6: string to number javascript

new Number(valeur);
var a = new Number('123'); // a === 123 donnera false
var b = Number('123'); // b === 123 donnera true
a instanceof Number; // donnera true
b instanceof Number; // donnera false