牛客网C语言语法篇练习之习题集（2）

左手的ㄟ右手 2023-09-29 10:38 19阅读 0赞

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16][]![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 1][] ![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 2][]

**目录**

1. 小乐乐改数字（也就是偶数变0，奇数变1）

2.牛牛的金币(坐标里找东西)

3.牛牛的计划（比日期）

4. 计算一元二次方程（计算方程按格式输出）

5. \[NOIP2008\]ISBN号码（这个题我感觉特别好，因为第一遍我没做出来）

6. 简单计算器(就是实现+-\*/)

7.牛牛学数列3

8. 数位之和

9.公务员面试（就是去掉最高最低分，剩下加起来求平均值）

10. 回文对称数(正着输入和反着的数字一样大)

接着上来篇来写，这个习题集我感觉写一些对我来说有点难度，并且值得大家一做的练习

下面，开始上内容吧

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 3][]

## 1. 小乐乐改数字（也就是偶数变0，奇数变1） ##

链接 [小乐乐改数字\_牛客题霸\_牛客网 (nowcoder.com)][_nowcoder.com]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 4][]

这道题就是输入一个数字 偶数变0，奇数变1

下面来分析一下、![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_14_color_FFFFFF_t_70_g_se_x_16][]

在实际做时，可以考虑有两种方法 递归，和非递归的

下来上代码，递归

#include<stdio.h>
    int figure(long long n)
    {
        int b=(n%10)%2;
        n=n/10;
        if(n)
        {
            return 10*figure(n)+b;
        }
        return b;
    }
    int main()
    {
        long long n=0;
        scanf("%lld",&n);
        int a=figure(n);
        printf("%d",a);
        return 0;
    }

非递归的

#include <stdio.h>
    int main()
    {
        int n = 0;
        scanf("%d",&n);
        int x = 1,y=0;        // x 用来控制当前位于哪一位
        while(x<n)        
        {
            y+=(n/x%2)*x;        // x 从1开始,等于从个位开始往上依次摩2,得到奇偶性之后再乘 x 即当前这个位数的0或者1      比如 1+10+100 一直加到加不了
            x*=10;
        }printf("%d",y);
        return 0;
    }

或者

#include <stdio.h>
    
    int main()
    {
        int n = 0;
        scanf("%d", &n);
    
        int ret = 0;
        int i = 0;
        while (n)
        {
            int w = n % 10;
            if (0 == w % 2)
            {
                w = 0;
            }
            else
            {
                w = 1;
            }
            ret += w * pow(10, i++);
            n /= 10;
        }
    
        printf("%d\n", ret);
    
        return 0;
    }

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 5][] ![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 5][]

## 2.牛牛的金币(坐标里找东西) ##

链接 [牛牛的金币\_牛客题霸\_牛客网 (nowcoder.com)][_nowcoder.com 1]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 6][]

下面分析一下

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 7][]

上代码

#include<stdio.h>
    
    int main()
    {
        int x=0,y=0;
        int x1=0,y1=0;
        scanf("%d %d",&x,&y);
        scanf("%d %d",&x1,&y1);
        if(x1==x)
        {
            y1>y?printf("u"):printf("d");
        }
        else
        {
            x1>x?printf("r"):printf("l");
        }
        
        return 0;
    }

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 8][]![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 9][]

## 3.牛牛的计划（比日期） ##

链接 [牛牛的计划\_牛客题霸\_牛客网 (nowcoder.com)][_nowcoder.com 2]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 10][]

分析一下

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_15_color_FFFFFF_t_70_g_se_x_16][]

上代码

#include<stdio.h>
    
    int main()
    {
        int y,m,d;
        int y1,m1,d1;
        scanf("%d %d %d\n",&y,&m,&d);
        scanf("%d %d %d\n",&y1,&m1,&d1);
        if((y1>y)||((y1>=y)&&(m1>m))||((y1>=y)&&(m1>=m)&&(d1>=d)))
        {
            printf("yes\n");
        }
        else
        {
            printf("no\n");
        }
        
        return 0;
    }

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 11][] ![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 12][]

## 4. 计算一元二次方程（计算方程按格式输出） ##

链接 [计算一元二次方程\_牛客题霸\_牛客网 (nowcoder.com)][_nowcoder.com 3]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 13][]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_19_color_FFFFFF_t_70_g_se_x_16][]

#include<stdio.h>
    #include<math.h>
    int main()
    {
      float a=0,b=0,c=0;
       while(~scanf("%f %f %f",&a,&b,&c)) {
        double d=b*b-4*a*c;
           if(a != 0){
            if(d > 0){
                printf("x1=%.2lf;x2=%.2lf\n",(-b-sqrt(d))/(2*a),(-b+sqrt(d))/(2*a));
            }else if(d ==0){
                if((-b/(2*a))==0){
                    printf("x1=x2=0.00\n");
                } else{
                    printf("x1=x2=%.2lf\n",-b/(2*a));
                }
            }else{
               
                  float s = -b/(2*a);
                  float x = sqrt(-d)/(2*a);
                  if(x>0){
                      printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi\n",s,x,s,x);
                  }else{
                      printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi\n",s,-x,s,-x);
                  }
                  
            }
        }else{
            printf("Not quadratic equation");
        }
       }
        return 0;
    }

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 14][] ![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 15][]

## 5. \[NOIP2008\]ISBN号码（这个题我感觉特别好，因为第一遍我没做出来） ##

链接 [\[NOIP2008\]ISBN号码\_牛客题霸\_牛客网 (nowcoder.com)][NOIP2008_ISBN_ _nowcoder.com]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 16][]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_19_color_FFFFFF_t_70_g_se_x_16 1][]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_14_color_FFFFFF_t_70_g_se_x_16 1][]![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_11_color_FFFFFF_t_70_g_se_x_16][]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 17][]

#include<stdio.h>
    
    int main()
    {
        char arr[13]={0};
        int i,j;
        scanf("%s",arr);
        int s=0;
        for(i=0,j=1;i<11;i++){
            if(arr[i]!='-'){
                s += (arr[i]-'0')*j;
                j++;
            }
        }
        int m=s%11;
        if(m == arr[12]-'0' || (m==10 && arr[12]=='X')){
            printf("Right\n");
        }else{
            if(m==10){
                for(i=0;i<12;i++){
                    printf("%c",arr[i]);
                }
                printf("X"); 
            }else{
                for(i=0;i<12;i++){
                    printf("%c",arr[i]);
                }
                printf("%d",m);
            }
        } 
        return 0;
    }

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 18][] ![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 19][]

## 6. 简单计算器(就是实现+-\*/) ##

链接 [简单计算器\_牛客题霸\_牛客网 (nowcoder.com)][_nowcoder.com 4]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 20][]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_15_color_FFFFFF_t_70_g_se_x_16 1][]

好了上代码，大家自己看一下，和自己想的一样吗

#include<stdio.h>
    
    int main()
    {
        double a,b;
        char c;
        scanf("%lf%c%lf",&a,&c,&b);
        if(c=='+'||c=='-'||c=='*'||c=='/')
        {
            if(c=='+')
            {
                 printf("%.4lf%c%.4lf=%.4lf\n",a,c,b,a+b);
            }
            else if(c=='-')
            {
                 printf("%.4lf%c%.4lf=%.4lf\n",a,c,b,a-b);
            }
            else if(c=='*')
            {
                 printf("%.4lf%c%.4lf=%.4lf\n",a,c,b,a*b);
            }
            else{
                  if(c=='/'&&b==0.0)
                  {
                printf("Wrong!Division by zero!\n");
                  }
                 else{
                printf("%.4lf%c%.4f=%.4lf\n",a,c,b,a/b);
                 }
            }
          
        }else{
            printf("Invalid operation!\n");
        }
        return 0;
    }

{
        switch (c)
       {
            case '+':
                printf("%.4lf+%.4lf=%.4lf",a,b,a+b);
                break;
            case '-':
                printf("%.4lf-%.4lf=%.4lf",a,b,a-b);
                break;
            case '*':
                printf("%.4lf*%.4lf=%.4lf",a,b,a*b);
                break;
            case '/':
                if(b == 0.0)
              {
                printf("Wrong!Division by zero!");
              }
                else
                printf("%.4lf/%.4lf=%.4lf",a,b,a/b);
                break;
            default:
                printf("Invalid operation!");
          break;
       }
    }
    return 0;

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 21][] ![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 22][]

## 7.牛牛学数列3 ##

链接 [牛牛学数列3\_牛客题霸\_牛客网 (nowcoder.com)][3_ _nowcoder.com]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 23][]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_16_color_FFFFFF_t_70_g_se_x_16][]

#include<stdio.h>
    
    int main()
    {
        int n;
        scanf("%d",&n);
        int i,s=1;
        int tmp=0;
        double sum=0;
        for(i=1;i<=n;i++)
        {
            tmp+=s*(2*i-1);
            sum+=1.0/tmp;
            s=-s;
        }
        printf("%.3lf\n",sum);
        return 0;
    }

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 24][] ![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 25][]

## 8. 数位之和 ##

链接 [数位之和\_牛客题霸\_牛客网 (nowcoder.com)][_nowcoder.com 5]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_8_color_FFFFFF_t_70_g_se_x_16][]![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_15_color_FFFFFF_t_70_g_se_x_16 2][]

#include<stdio.h>
    
    int main()
    {
        int a=0,sum=0,b=0;
        scanf("%d",&a);
        while(a>0)
        {     
            sum+=a%10;
            a/=10;
        }
        printf("%d",sum);
        return 0;
    }

## ![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 26][]![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 27][] ##

## 9.公务员面试（就是去掉最高最低分，剩下加起来求平均值） ##

链接 [公务员面试\_牛客题霸\_牛客网 (nowcoder.com)][_nowcoder.com 6]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 28][]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 29][]

#include <stdio.h>
    int main()
    {
    	int a, max = 0, small = 100, sum = 0, count = 0;
    	while (scanf("%d", &a) != EOF)
    	{   //把最大最小值找出拿出来
    		if (a > max)
    		{
    			max = a;
    		}
    		if (a < small)
    		{
    			small = a;
    		}
            //求和
    		sum += a;
    		count++;
    		if (count == 7)//计数器=7时代表一组的分数好了可以进行计算
    		{
    			printf("%.2f\n", (sum - max - small) / 5.0);
    			count = 0;
    			max = 0;
    			small = 100;
    			sum = 0;
    		}	
    	}
    
    	return 0;
    }

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 30][] ![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 30][]

## 10. 回文对称数(正着输入和反着的数字一样大) ##

链接 [回文对称数\_牛客题霸\_牛客网 (nowcoder.com)][_nowcoder.com 7]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 31][]

分析一下![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_12_color_FFFFFF_t_70_g_se_x_16][]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 32][]

#include<stdio.h>
    
    int main()
    {
        int n=0;
        scanf("%d",&n);
        int i=0;
        for(i=1;i<=n;i++)
        {
            int t=0,num=i;
            while(num>0)
            {
                t=t*10+num%10;
                num=num/10;
            }
            if(t==i)
            {
                printf("%d\n",i);
            }
        }
        return 0;
    }

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 33][]

[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/460fb3a367ea4e71b659a0e6710fe81d.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA,size_20,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 1]: https://img-blog.csdnimg.cn/3a76dda5179240819dfefb1feadc29ac.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA,size_20,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA_size_20_color_FFFFFF_t_70_g_se_x_16 2]: https://img-blog.csdnimg.cn/d70f9292efcb4b538c6a3b1256517507.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5b-r5Yiw6ZSF6YeM5p2l5ZGA,size_20,color_FFFFFF,t_70,g_se,x_16
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[NOIP2008_ISBN_ _nowcoder.com]: https://www.nowcoder.com/practice/95712f695f27434b9703394c98b78ee5?tpId=290&tags=&title=&difficulty=0&judgeStatus=0&rp=0&sourceUrl=%2Fexam%2Foj%3Ftab%3D%25E8%25AF%25AD%25E6%25B3%2595%25E7%25AF%2587%26topicId%3D290
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[3_ _nowcoder.com]: https://www.nowcoder.com/practice/f65c726d081c4160a9356eabf0dc21d9?tpId=290&tags=&title=&difficulty=0&judgeStatus=0&rp=0&sourceUrl=%2Fexam%2Foj%3Ftab%3D%25E8%25AF%25AD%25E6%25B3%2595%25E7%25AF%2587%26topicId%3D290
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[_nowcoder.com 5]: https://www.nowcoder.com/practice/5e85cc26475449648e668aa98e92d05b?tpId=290&tags=&title=&difficulty=0&judgeStatus=0&rp=0&sourceUrl=%2Fexam%2Foj%3Ftab%3D%25E8%25AF%25AD%25E6%25B3%2595%25E7%25AF%2587%26topicId%3D290
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