PTA Zhejiang University edition "C language programming experiment and exercise guidance (3rd edition)" question set (reference answer)

This collection of topics was written by the blogger when he was learning C language. Some of the code may be funny. Do not spray or spray.
The programming questions have been completed, and the function questions are being continuously updated...
Note: The codes of some of the questions are referenced by others.

Programming questions:

Title number	Topic name
Experiment 1-1	Hello World!
Experiment 1-2	Welcome to You!
Experiment 1-3	Programming in C is fun!
Experiment 1-4	Output triangle
Experiment 1-5	Output diamond pattern
Experiment 1-6	Output boxed text
Experiment 1-7	What is a computer?
Experiment 1-8	Output inverted triangle pattern
Experiment 2-1-1	Calculate the temperature in Celsius
Experiment 2-1-2	Temperature conversion
Experiment 2-1-3	Calculate the free fall distance of an object
Experiment 2-1-4	Calculate the average score
Experiment 2-1-5	Assign the square of x to y
Experiment 2-1-6	Calculate Fahrenheit temperature
Experiment 2-1-7	The digits of the integer 152
Experiment 2-2-1	Calculate the piecewise function [1]
Experiment 2-2-2	Calculate the temperature in Celsius
Experiment 2-2-3	Calculate deposit interest
Experiment 2-2-4	Calculate the piecewise function [2]
Experiment 2-2-5	Find the integer mean
Experiment 2-2-6	Calculate piecewise function [3]
Experiment 2-2-7	Four arithmetic of integers
Experiment 2-2-8	Tiered price
Experiment 2-2-9	Calculate train running time
Experiment 2-3-1	Find the sum of 1 to 100
Experiment 2-3-2	Find the sum of the first N items of the Nth sequence
Experiment 2-3-3	Find the sum of the first N items in an odd-numbered part of the sequence
Experiment 2-3-4	Find the sum of the first N terms in a simple interleaved sequence
Experiment 2-3-5	Output Fahrenheit-Celsius temperature conversion table
Experiment 2-3-6	Find the sum of the first N terms in the interleaved sequence
Experiment 2-3-7	Find the partial sum of the square and reciprocal sequence
Experiment 2-4-2	Generate 3 power table
Experiment 2-4-3	Find the sum of the first N terms in the square root sequence
Experiment 2-4-4	Find the sum of the first N terms of the factorial sequence
Experiment 2-4-6	Sum of exponentiation
Experiment 2-4-7	Find the number of combinations
Experiment 3-1	Find the roots of a quadratic equation in one unknown
Experiment 3-2	Calculate the value of the sign function
Experiment 3-3	Comparison of size
Experiment 3-4	Statistical characters
Experiment 3-5	Check fruit price
Experiment 3-6	Calculate personal income tax
Experiment 3-7	Statistics of student performance
Experiment 3-8	Output triangle area and perimeter
Experiment 3-9	Three days of fishing and two days of drying the net
Experiment 3-10	Highway speeding penalty
Experiment 3-11	Calculate gas bill
Experiment 4-1-1	Greatest common divisor and least common multiple
Experiment 4-1-2	Find odd sum
实验4-1-3	找出最小值
实验4-1-4	求整数的位数及各位数字之和
实验4-1-5	韩信点兵
实验4-1-6	求分数序列前N项和
实验4-1-7	特殊a串数列求和
实验4-1-8	求给定精度的简单交错序列部分和
实验4-1-9	猜数字游戏
实验4-1-10	兔子繁衍问题
实验4-1-11	高空坠球
实验4-1-12	黑洞数
实验4-2-2	求e的近似值
实验4-2-3	验证“哥德巴赫猜想”
实验4-2-4	换硬币
实验4-2-5	水仙花数
实验4-2-6	输出三角形字符阵列
实验4-2-7	找完数
实验4-2-8	输出整数各位数字
实验4-2-9	梅森数
实验6-1	近似求PI
实验6-8	简单计算器
实验6-9	统计一行文本的单词个数
实验7-1-1	简化的插入排序
实验7-1-2	求最大值及其下标
实验7-1-3	将数组中的数逆序存放
实验7-1-4	找出不是两个数组共有的元素
实验7-1-5	选择法排序
实验7-1-6	求一批整数中出现最多的个位数字
实验7-1-7	查找整数
实验7-1-8	输出数组元素
实验7-1-9	数字加密
实验7-1-10	交换最小值和最大值
实验7-1-11	求整数序列中出现次数最多的数
实验7-1-12	组个最小数
实验7-1-13	装箱问题
实验7-2-1	求矩阵各行元素之和
实验7-2-2	矩阵运算
实验7-2-3	求矩阵的局部极大值
实验7-2-4	计算天数
实验7-2-5	判断上三角矩阵
实验7-2-6	打印杨辉三角
实验7-2-7	方阵循环右移
实验7-2-8	找鞍点
实验7-2-9	螺旋方阵
实验7-2-10	简易连连看
实验7-3-1	字符串逆序
实验7-3-2	查找指定字符
实验7-3-3	统计大写辅音字母
实验7-3-4	字符串替换
实验7-3-5	输出大写英文字母
实验7-3-6	字符串转换成十进制整数
实验7-3-7	字符转换
实验7-3-8	统计字符出现次数
实验7-3-9	字符串字母大小写转换
实验7-3-10	删除重复字符
实验8-1-9	输出学生成绩
实验8-2-1	找最小的字符串
实验8-2-2	找最长的字符串
实验8-2-8	字符串排序
实验8-2-10	IP地址转换
实验9-1	计算职工工资
实验9-2	时间换算
实验9-3	计算平均成绩
实验9-5	查找书籍
实验9-7	找出总分最高的学生
实验9-8	通讯录排序
实验9-9	有理数比较
实验9-10	平面向量加法
实验10-1	圆形体体积计算器
实验11-1-1	英文单词排序
实验11-1-7	藏头诗
实验11-1-9	藏尾诗

函数题

题目号	题目名
实验2-4-1	统计各位数字之和是5的数
实验2-4-5	简单实现x的n次方
实验5-1	使用函数计算两个复数之积
实验5-2	符号函数
实验5-3	使用函数求奇数和
实验5-4	使用函数计算两点间的距离
实验5-5	使用函数求素数和
实验5-6	使用函数判断完全平方数
实验5-7	使用函数求1到10的阶乘和