JavaScript: Check whether it is possible to replace $ in a specified expression

JavaScript Basic: Exercise-89 with Solution

Replace $ in Expression to Make True

Write a JavaScript program to check whether it is possible to replace $ in a given expression x $ y = z with one of the four signs +, -, * or / to obtain a correct expression.

For example x = 10, y = 30 and z = 300, we can replace $ with a multiple operator (*) to obtain x * y = z

Visual Presentation:

Sample Solution:

JavaScript Code:

 // Function to check if there is an arithmetic expression (addition, multiplication, division, or subtraction) among three numbers
function check_arithmetic_Expression(x, y, z) {
  // Check if any of the arithmetic expressions holds true
  return x + y == z || x * y == z || x / y == z || x - y == z;
}

// Examples of using the function
console.log(check_arithmetic_Expression(10, 25, 35));   // true, as 10 + 25 = 35
console.log(check_arithmetic_Expression(10, 25, 250));  // true, as 10 * 25 = 250
console.log(check_arithmetic_Expression(30, 25, 5));    // true, as 30 / 25 = 1.2
console.log(check_arithmetic_Expression(100, 25, 4.0)); // true, as 100 / 25 = 4.0
console.log(check_arithmetic_Expression(100, 25, 25));  // true, as 100 - 25 = 75

Output:

true
true
true
true
false

Live Demo:

See the Pen javascript-basic-exercise-89 by w3resource (@w3resource) on CodePen.

Flowchart:

ES6 Version:

// Function to check if any of the arithmetic expressions (addition, multiplication, division, subtraction) is true
const check_arithmetic_Expression = (x, y, z) => {
  // Return true if any of the arithmetic expressions is true
  return x + y == z || x * y == z || x / y == z || x - y == z;
};	

// Example usage
console.log(check_arithmetic_Expression(10, 25, 35));    // true
console.log(check_arithmetic_Expression(10, 25, 250));   // true
console.log(check_arithmetic_Expression(30, 25, 5));      // true
console.log(check_arithmetic_Expression(100, 25, 4.0));   // true
console.log(check_arithmetic_Expression(100, 25, 25));    // false

For more Practice: Solve these Related Problems:

• Write a JavaScript program that takes an expression containing a '$' operator and tests each arithmetic operator (+, -, *, /) to see which one validates the equation.
• Write a JavaScript function that iterates over the four arithmetic operators to replace '$' in a given expression and returns the valid operator if found.
• Write a JavaScript program that parses a string expression with a placeholder and systematically checks all operations to determine which one makes the equation true, while handling division by zero.

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