[0311] C + + Simple programming-1

Experimental Report of Nanjing University of Information Engineering

Experiment Name C + + simple programming-1 experimental date 2018-3-13 score Instructor Shan Department of Soft College professional embedded + soft-embedded grade 2017 Frequency (1) name Schhao Yang School number 20161334026

First, the purpose of the experiment

• familiar with C + + program development environment, experience the steps and methods of writing and running a simple C + + program using devc++, Code::Blocks, vs2017.
• Master the basic methods of data input and output in C + +
• Statements that master branching structures and looping structures

II. Preparation of the experiment

Before the experiment, please study the content in combination with teaching material and web search.

• Development environment Use
  • Steps for writing and running C + + programs in devc++
  • Steps for writing and running C + + programs in Code::Blocks
  • Steps for writing and running C + + programs in vs2017
• Simple C + + program structure reading, learning materials "2.1.3 C + + program examples"
• Basic methods of data input and output in C + + read and learn 2.3 sections, learn basic usage of I/O flow, predefined caret < > in C + + <和提取符> .
• Use of the IF statement, switch statement, while statement, Do...while statement
  In conjunction with example 2-4 and example 2-6, understand the simple algorithm behind the example and the switch statement, break statement, Do...while statement involved.

Iii. contents of the experiment

• Validation experiments
  • Devc++, code::blocks, vs2017 software download and installation See course e-mail → file Center under "Software download URL." pdf"
  • Write and run the textbook example 2-1 in the C + + program development environment (Devc++, Code::Blocks, vs2017). Understand the simple C + + program structure and how to write and run it.
  • Run the textbook example 2-4 to understand the use of the switch statement and the break statement involved.
  • Run the textbook example 2-6 to understand the arithmetic expressions involved and the use of circular statements.
• Programming exercises
  • Reference textbook example 2-4, programming implementation: Input 1~7 Integer, if the input is a delivery, then output "workday." Let's work hard "; If you enter 6~7, the output is" weekend. Let ' s has a rest. "
  • Textbook Example 2-6, enter an integer to invert the numbers and output. (for example, enter 365, output 563.) In the implementation of example 2-6, the 5-6-3 is output one by three times, and the program is programmed to implement 563 as a total output of a number. ）

Iv. conclusion of the experiment

• Programming exercises (1) source code and running results

  • Code:

    #include<bits/stdc++.h>#define workday() cout<<"Workday. Let's work hard."<<endl;#define weekend() cout<<"Weekend. Let's have a rest."<<endl;using namespace std;int main(){     int day;  cin>>day;  switch (day)  {  case 1:workday();break;  case 2:workday();break;  case 3:workday();break;  case 4:workday();break;  case 5:workday();break;  case 6:weekend();break;  case 7:weekend();break;  default:puts("Wrong Number!\n");break;  }  return 0;}

  • Screenshot:
    

• Programming exercises (2) source code and running results

  • Code1:

    #include<bits/stdc++.h>using namespace std;int main(){  int num,ans=0;  cin>>num;  do{  ans=ans*10+num%10;  num/=10;  }while(num);  cout<<ans;  return 0;}

  • Screenshot:
    

Five, the experiment summary and experience

• The biggest problem encountered in this experiment is the use of markdown language, the native syntax does not support underscores, cannot define a two-level ordered list, code indentation cannot be represented ... After searching, these problems have been solved by using the
  

  
  123
  

• The method used in programming experiment 2 has insufficient processing on big data, can be solved by string, and the time efficiency is also lower, with code:

  • Code:

    #include<bits/stdc++.h>using namespace std;string work_stl(string num){  while (num[num.length()-1]=='0')  num=num.substr(0,num.length()-1);  return num==""?"0":num;}int main(){  string num;  cin>>num;  num=work_stl(num);  reverse(num.begin(),num.end());  cout<<num;  return 0;}

  • Screenshot:
    

[0311] C + + Simple programming-1