0033【Edabit ★☆☆☆☆☆】【字符串表达式计算器】Miserable Parody of a Calculator

Jim-2ha02023-10-26 7:09

0033【Edabit ★☆☆☆☆☆】【字符串表达式计算器】Miserable Parody of a Calculator

algebra math strings

Instructions

Create a function that will handle simple math expressions. The input is an expression in the form of a string.

Examples

javascript 复制代码

calculator("23+4") // 27
calculator("45-15") // 30
calculator("13+2-5*2") // 5
calculator("49/7*2-3") // 11

Notes

There will be no brackets in the input line.
No need to calculate mathematical functions (sin, cos, ln...).
There are no gaps in the expression.

Solutions

javascript 复制代码

function calculator(str) {
    return eval(str)
}

TestCases

javascript 复制代码

let Test = (function(){
    return {
        assertEquals:function(actual,expected){
            if(actual !== expected){
                let errorMsg = `actual is ${actual},${expected} is expected`;
                throw new Error(errorMsg);
            }
        }
    }
})();

Test.assertEquals(calculator("23+4"), 27)
Test.assertEquals(calculator("45-15"), 30)
Test.assertEquals(calculator("13+2-5*2"), 5)
Test.assertEquals(calculator("49/7*2-3"), 11)
Test.assertEquals(calculator("2+2*2"), 6)
Test.assertEquals(calculator("5/2"), 2.5)
Test.assertEquals(calculator("-34/4"), -8.5)
Test.assertEquals(calculator("0+43-0+56*0"), 43)
Test.assertEquals(calculator("-14*2-37-0"), -65)
Test.assertEquals(calculator("0*0"), 0)
Test.assertEquals(calculator("4+2+3-5*2-8/4-12-0+3-14"), -26)
Test.assertEquals(calculator("9/2+9/4"), 6.75)
Test.assertEquals(calculator("56*27*18*12/2*0"), 0)
Test.assertEquals(calculator("34/4*0*45*7"), 0)