我正在尝试编写一个算法来生成一个基本的减法问题。类似于 18-10-4=4。该算法应接受以下参数：
操作数最小值、操作数最大值、结果最小值、结果最大值、操作数数量
它应该为每个操作数在 oMin 和 oMax 之间选择多个随机数，并为结果选择 rMin 和 rMax 之间的随机数。所以是这样的：
var generateSubtractionProblem = function (oMin, oMax, rMin, rMax, oQuantity) {
var result,
operands = []
maxDiff = oMax - (oMin * (oQuantity - 1)),
minDiff = oMin - (oMax * (oQuantity - 1)),;
// Pick result
// Generate operands within range that when subtracted produce result
if (rMax < minDiff || rMin > maxDiff) {
console.log('Cannot produce result');
return {
result: 2,
operands: [4, 2]
};
}
if (maxDiff < rMax) {
console.log('Max difference is ' + maxDiff);
rMax = maxDiff;
}
result = this.randomInRange(rMin, rMax, rPrecision);
for (var i = 0; i < oQuantity; i += 1) {
switch (i) {
case 0:
operands[i] = this.randomInRange((oMin * (oQuantity - 1)) + result, oMax, oPrecision);
break;
case 1:
operands[i] = operands[i - 1] - result;
break;
default:
operands[i] = this.randomInRange(oMin, (oMin * (oQuantity - i)), oPrecision);
break;
}
}
return {
result: result,
operands: operands
}
}
generateSubtractionProblem(5, 20, 0, 5, 3);
// { result: 4, operands: [18, 10, 4] }... 18-10-4=4
任何语言的示例都会有所帮助。