笔试—经纬恒润嵌入式软件笔试

题型：10道单选、5道不定项、5道填空、2道编程

编程题答案

#include <iostream>
#include <iomanip>

double sqrt_binary_search(double num, double precision) {
    if (num < 0) {
        return -1;
    }

    double left = 0, right = num;
    double mid = (left + right) / 2;

    while (right - left > precision) {
        if (mid * mid > num) {
            right = mid;
        } else {
            left = mid;
        }
        mid = (left + right) / 2;
    }

    return mid;
}

int main() {
    double num;
    std::cin >> num;
    double result = sqrt_binary_search(num, 1e-5);
    std::cout << std::fixed << std::setprecision(5) << result << std::endl;
    return 0;
}

#include <iostream>
#include <vector>

using namespace std;

int maxSubArray(vector<int>& nums) {
    int pre = 0, maxAns = nums[0];
    for (const auto &x: nums) {
        pre = max(pre + x, x);
        maxAns = max(maxAns, pre);
    }
    return maxAns;
}


int main() {
    vector<int> nums;
    int num;

    while (cin >> num) {
        nums.push_back(num);
        if (cin.get() == '\n') {
            break;
        }
    }

    int result = maxSubArray(nums);
    cout << result << endl;

    return 0;
}

10道单选、5道不定项、5道填空题答案在底部

单选题：

1、下面总线采用异步时序协议的是

1、USB

2、I2C

3、SPI

4、PCI

2、设有int x=11;则表达式(X+＋*1/3)的值是

1、11

2、12

3、4

4、3

3、为了比较两个字符串s1和s2是否相等,应当使用（）

1、if(strcmp(s1, s2)==0)

2、if(strcmp (&s1, &s2) ==0)

3、if