[Python知识库]EE308_LAB2

?Content

🎪The Links

https://github.com/yyx0115/EE308_LAB2/tree/main

📝PSP FORM

🌋Description of problem-solving ideas

1. Choose Language

• c++/c
• Python
• java

2. Review the knowledge of C/C++
   we need to know the keywords:
   

After last semester’s study, I acquired some knowledge about Java, C ++/ C. It’s a pity that I didn’t learn Python yet. After a summer vacation of “indulgence”, before starting this assignment, I need to review the “if-else” knowledge to wake up my memory

4. rough thinking

• The file is read in the specified address

• Create a user input class

• a search class to find the keywords

• a class to calculate the number of keywords and the times of switches and cases

• use pointer function probably

• the number of if-else and if else if else

📜The Chart of the Key Functions

💫Code Description

1. create a file named “in.txt” include?:

#include <stdio.h>
int main(){
    int i=1;
    double j=0;
    long f;
    switch(i){
        case 0:
            break;
        case 1:
            break;
        case 2:
            break;
        default:
            break;
    }
    switch(i){
        case 0:
            break;
        case 1:
            break;
        default:
            break;
    }
    if(i<0){
        if(i<-1){}
        else{}
    }
    else if(i>0){
        if (i>2){}
        else if (i==2) {}
        else if (i>1) {}
        else {}
    }
    else{
        if(j!=0){}
        else{}
    }
    return 0;
}

2. The input?：

   #include<bits/stdc++.h>
   using namespace std;
   map<string,int> mp;
   string words[32]={"auto","case","char","const","do",
   		   "double","enum","extern","float","goto",
   		   "int","long","register","short","signed","static",
   		   "struct","typedef","union","unsigned","void","volatile","while"
   		   ,"break","continue","for","if","sizeof","switch","return","default","else"};
   

3. open and read the file?:

void getNum(char *s,int grade){
	queue<int> q;
	ifstream infile;
	infile.open(s,ios::in);
	if (!infile){
		printf("file opened failure！！！");
		return ; 
	}

4. To find the switch and case numbers?:

	string temp;
	bool judgeswitch=false;
	int cntcase;
	while (!infile.eof()){
		infile>>temp;
		//cout<<temp<<endl;
		for (int i=0;i<32;i++){
			if (i<22){
				if (temp==words[i]){
					mp[temp]++;
					if (temp=="case"&&judgeswitch)   cntcase++;
				}   
			}
			else{
				if (temp.substr(0,words[i].size())==words[i]){
					if (temp.size()==words[i].size()){
						mp[words[i]]++;
						if (words[i]=="switch"){
							judgeswitch=true;
							cntcase=0;
						} 
						else if (words[i]=="default"){
							judgeswitch=false;
							q.push(cntcase);
						}  
					}   
					else if (temp[words[i].size()]=='('||temp[words[i].size()]==';'||temp[words[i].size()]==':'
					||temp[words[i].size()]=='{'){
						mp[words[i]]++;
						if (words[i]=="switch"){
							judgeswitch=true;
							cntcase=0;
						}   
						else if (words[i]=="default"){
							judgeswitch=false;
							q.push(cntcase);
						}  
					}
				}
			}
		}
	}

5. output and the main function?:

int total=0;
	for (auto v:mp){
		//output all the keywords
		//cout<<v.first<<" : "<<v.second<<endl;
		//calculate the sum
		total+=v.second;
	}
	cout<<"total num:"<<total<<endl;
	if (grade==2){
		cout<<"switch num: "<<q.size()<<endl;
		cout<<"case num: ";
		while (!q.empty()){
			cout<<q.front()<<" ";
			q.pop();
		}
	}
}
int main(){
	char url[100];
	int grade;
	cout<<"Enter the file path and judgment level："<<endl;  // in.txt level 2
	cin>>url>>grade;
	getNum(url,grade);
	return 0;
}

6. The output?

The entire code

#include<bits/stdc++.h>
using namespace std;
map<string,int> mp;
string words[32]={"auto","case","char","const","do",
		   "double","enum","extern","float","goto",
		   "int","long","register","short","signed","static",
		   "struct","typedef","union","unsigned","void","volatile","while"
		   ,"break","continue","for","if","sizeof","switch","return","default","else"};

void getNum(char *s,int grade){
	queue<int> q;
	ifstream infile;
	infile.open(s,ios::in);
	if (!infile){
		printf("file opened failure！！！");
		return ; 
	}
	string temp;
	bool judgeswitch=false;
	int cntcase;
	while (!infile.eof()){
		infile>>temp;
		//cout<<temp<<endl;
		for (int i=0;i<32;i++){
			if (i<22){
				if (temp==words[i]){
					mp[temp]++;
					if (temp=="case"&&judgeswitch)   cntcase++;
				}   
			}
			else{
				if (temp.substr(0,words[i].size())==words[i]){
					if (temp.size()==words[i].size()){
						mp[words[i]]++;
						if (words[i]=="switch"){
							judgeswitch=true;
							cntcase=0;
						} 
						else if (words[i]=="default"){
							judgeswitch=false;
							q.push(cntcase);
						}  
					}   
					else if (temp[words[i].size()]=='('||temp[words[i].size()]==';'||temp[words[i].size()]==':'
					||temp[words[i].size()]=='{'){
						mp[words[i]]++;
						if (words[i]=="switch"){
							judgeswitch=true;
							cntcase=0;
						}   
						else if (words[i]=="default"){
							judgeswitch=false;
							q.push(cntcase);
						}  
					}
				}
			}
		}
	}
	int total=0;
	for (auto v:mp){
		//output all the keywords
		//cout<<v.first<<" : "<<v.second<<endl;
		//calculate the sum
		total+=v.second;
	}
	cout<<"total num:"<<total<<endl;
	if (grade==2){
		cout<<"switch num: "<<q.size()<<endl;
		cout<<"case num: ";
		while (!q.empty()){
			cout<<q.front()<<" ";
			q.pop();
		}
	}
}
int main(){
	char url[100];
	int grade;
	cout<<"Enter the file path and judgment level："<<endl;  // in.txt level 2
	cin>>url>>grade;
	getNum(url,grade);
	return 0;
}

🎄Summarize this assignment

• I gained new knowledge on how to use GitHub,created my own GitHub page. ?(′▽｀)

• wrote code in the process of consolidating and reviewing the previous courses. After relearning, I found many deficiencies and did not grasp many details in place. ( ?? ω ?? )y

• Learned how to draw a flow chart with markdown and plan in advance with PSP form, which greatly improved the efficiency

• I feel very guilty for not completing the last two levels of questions, and my ability still needs to be improved. `(>﹏<)′

• The knowledge points of file flow need to be further strengthened. The reason why we choose to use C + + is that the knowledge of Java is not proficient enough and needs to be further study.