problem	answer
This work belongs courses	C Programming Language 1
Where this requirement in the job	https://edu.cnblogs.com/campus/zswxy/CST2019-2
My aim in this course is	Skilled have some computer skills
This job helped me achieve that goal in terms of specific	Repeated practice found in the course of a feeling, so I'm more familiar with computer
references	"Question the wisdom"

1.PTA lab assignments

1.1 1 topic name

 计算序列 1 + 1/2 + 1/3 + ... 的前N项之和。

Input format:
input line in a given positive integer N.
Output format:
output section and the value S in accordance with the "sum = S" format in a row, six decimal place. Title ensure that the calculation result does not exceed the double precision.
Sample input:
23
sample output:
SUM = 2.549541

1.1.1 Data Processing

###数据表达：我定义了n, i, denominator,sum,item这些变量，这些变量的值都是我赋的值，前面3个是整型变量，后面两个是浮点型变量。
###数据处理：我用到了  item = 1.0/denominator， sum = sum + item，denominator = denominator + 2。用的是for循环流程结构。

1.1.2 Screenshot experiment code

1.1.3 Test data was

Input data	Output Data	Explanation
20	cost=2.479673	Less than 50
70	cost=3.106007	More than 50
50	cost=2.937775	Equal to 50
-4	cost=0.000000	Less than 50

1.1.4PTA submit a list and description

1. Wrong Answer: Some space problems, but also did not notice the decimal point to be retained at the beginning.
2. Wrong Answer: the expression is not accurate.
3. Compile Error: forget the code necessary to play, there is
4. Compile Error: Some semicolon did not notice.
5. Compile error: 6 No decimal place.
6. All correct: . .

1.2 Question 2

本题要求编写程序,计算序列 1 - 1/4 + 1/7 - 1/10 + ... 的前N项之和。
输入格式:
输入在一行中给出一个正整数N。
输出格式:
在一行中按照“sum = S”的格式输出部分和的值S，精确到小数点后三位。题目保证计算结果不超过双精度范围。
输入样例:
  10
输出样例:
  sum = 0.819

1.2.1 Data Processing

 ###数据表达：用到了 n, flag, denominator, i， sum, item这些变量，自己赋的值，前面3个是整型变量，后面2个是浮点型变量。
 ###数据处理：用到了 item = flag*1.0/denominator， sum = sum + item， flag = -flag， denominator = denominator + 3这些表达式，用的是for循环流程。

1.2.2 Code Screenshot

1.2.3 build test data

Input data	Output Data	Explanation
30	cost=0.830	Less than 50
90	cost=0.834	More than 50
50	cost=0.832	Equal to 50
-10	cost=0.000	Less than 50

1.2.4PTA submit a list and description

1. Compile Error: less defined variables.
2. Wrong Answer: Expressions order wrong.
3. Wrong Answer: Forget the variable assignment.
4. All correct: . .

2. Code peer assessment

 同学代码截图

Own Code Screenshot

(1): They expression after the statement for only two expressions, I have three, because I defined a multi-variable than their item, so my expression than them.

(2): They're back to two expressions are merged, it seems simple, others are similar.

3. learning summary

3.1 learning progress bar

Week / Date	This week the time spent	Lines of code
October 16	2 hours	30
October 17	2 hours	50
10 May 18	4 hours	20

3.2 Cumulative lines of code words and blog

time	Words blog	The number of lines of code
the first week	300	45
the second week	330	40
The third week	840	110
the fourth week	800	90

3.3 Summary and perception of learning content

3.3.1 learning content summary

  在这一周中我们首先学习了华氏-摄氏度温度转换，紧接着学习了一种新的语法，for循环结构。在for循环结构中的括号里面有三个部分，包括赋值、限定条件和表达式。懂了for循环结构和保留精确度的结合，就像上次的if-else结合一样。这个for语句的经典例子就是从1加到n这种求和的问题。也是我们现在在练习的问题。

3.3.2 Learning Experience

   在这一周的C语言学习过程中，我发现在课堂上比以前更加的有感觉一些了，能跟着老师的思路一步一步的走了。在本周的作业中比上次感觉不一样了，虽然还是有不懂，但是没关系，慢慢来吗。我觉得现在老师的这个上课思路很好，先讲作业，复习，上新课。可以让我们更加深刻。我觉得在后面的学习中应该要提前预习，走在老师的前面。

C language blog 1 Job 04