机试刷题

机试刷题记录

一、刷题

L1-007 念数字

题目链接：https://pintia.cn/problem-sets/994805046380707840/exam/problems/994805136889593856?type=7&page=0

错误答案：

#include<stdio.h>
#include<math.h>
int x,y;
char str[10][5]={"ling","yi","er","san","si","wu","liu","qi","ba","jiu"};
void dayin(int num)
{
    x=num/10;
    y=num%10;
    dayin(x);
    printf("%s ",str[y]);
}
int main()
{
    int num;
    scanf("%d",&num);
    if(num<0) printf("fu ");
    dayin(num);
    printf("%s ",str[y]);
    return 0;
    
}

正确答案

#include<stdio.h>
#include<math.h>

char nums[10][5] = {"ling","yi","er","san","si","wu","liu","qi","ba","jiu"};

void dayin(int num)
{
	int s_num = num%10;
	num = num/10;
	if(num!=0)
	{
		dayin(num);
		printf(" %s",nums[s_num]);	
	}
	else{
		printf("%s",nums[s_num]);	
	} 
	
}

int main()
{
	int num;
	scanf("%d",&num);
	
	if(num < 0) {
		num = -num;
		printf("fu ");
	}	
	
	dayin(num);
	return 0;
}

L1-017 到底有多二

题目链接：https://pintia.cn/problem-sets/994805046380707840/exam/problems/994805121500692480?type=7&page=0

#include<stdio.h>
#include<math.h>
#include<string.h>
char num[55];
int main()
{
	scanf("%s",num);
	int len = strlen(num);
	int is_even = 0, is_negtive = 0, digit_count = len, two_count = 0;
	if(num[0]=='-') is_negtive = 1, digit_count -= 1;
	if((num[len-1]-'0')%2==0) is_even = 1;
	int i;
	for(i=0;i<len;++i)
	{
		if(num[i]=='2') two_count += 1;
	}
	
	double ans = (double)two_count/(double)digit_count;
	
	if(is_negtive) ans *= 1.5;
	if(is_even) ans *= 2;
	
	ans *= 100;
	
	printf("%.2f%%",ans);
	
	return 0;
}

二、知识点