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Find x in equation

Aiman Tariq answered on October 24, 2022 Popularity 6/10 Helpfulness 1/10

answer Find x in equation

Find x in equation

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// Using the JavaScript language, have the function MissingDigit(str) take the str parameter, which will be a simple mathematical formula with three numbers, a single operator (+, -, *, or /) and an equal sign (=) and return the digit that completes the equation. In one of the numbers in the equation, there will be an x character, and your program should determine what digit is missing. For example, if str is "3x + 12 = 46" then your program should output 4. The x character can appear in any of the three numbers and all three numbers will be greater than or equal to 0 and less than or equal to 1000000. 

// Input:"4 - 2 = x"
// Output:2

// Input:"1x0 * 12 = 1200"
// Output:0

// function MissingDigit(str) {
  
//   arr = str.split('=');
  
//   let evalStr, complete; 
  
//   if (arr[0].includes('x')) {
//     evalStr = arr[0];
//     complete = arr[1];
//     } else {
//       evalStr = arr[1];
//       complete = arr[0];
//     }
  
//   let x = evalStr.indexOf('x');
//   let part1 = evalStr.slice(0, x);
//   let part2 = evalStr.slice(x+1, evalStr.length)
//   console.log(part1, part2)
  
//   for(var i=0; i<10; i++) {
//     let replacedX = part1 + i + part2;
//     if (eval(replacedX) === eval(complete)){
//       return i; 
//     }
//   }
  
// }


function MissingDigit(str) {
    var equation;
    for (var i = 0; i < 10; i++) {
        // plug in each number and see if it makes sense
        equation = str.replace(/x/, i).split('='); 
        // compare left hand side with the right hand side
        // and see if they are equal
        if (eval(equation[0]) === eval(equation[1])) return i;
    }
    return -1;
}

MissingDigit("4356 * 23 = 1001x8" )

Popularity 6/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: equation find javascript

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Contributed on Oct 24 2022

Aiman Tariq

0 Answers Avg Quality 2/10

Find x in equation

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