高级语言程序设计作业 10/21
- 2024高级语言程序设计：https://edu.cnblogs.com/campus/fzu/2024C
- 高级语言程序设计课程第三次作业：https://edu.cnblogs.com/campus/fzu/2024C/homework/13293
- 学号：102400215
- 姓名：胡加乘
6.16编程练习
1
/* 6.16.1.c -- 利用数组，打印26个小写字母 */
#include <stdio.h>
int main()
{
char alphabet[26];
for (int i = 0; i < 26; i++)
{
alphabet[i] = 97 + i;
printf("%c\n", alphabet[i]);
}
return 0;
}
5
/* 6.16.5.c -- 金字塔 */
#include <stdio.h>
int main()
{
char ch;
printf("Please enter an upper character: ");
scanf("%c", &ch);
int off = ch - 65;
for (int i = 0; i <= off; i++)
{
// 处理空格。
for (int sp = 0; sp < off - i; sp++)
printf(" ");
// 处理顺序字母输出。
int center = i;
for (int j = 0; j <= center; j++)
{
printf("%c", j + 65);
}
// 处理倒序字母输出。
for (int j = center - 1; j >= 0; j--)
{
printf("%c", j + 65);
}
printf("\n");
}
return 0;
}
7
/* 6.16.7.c -- 倒序打印一个单词 */
#include <stdio.h>
#include <string.h>
int main()
{
char word[100];
scanf("%s", word);
int len = strlen(word); // strlen读到第一个\0为止，因此声明数组时不用担心长度问题
for (int i = len - 1; i >= 0; i--)
{
printf("%c", word[i]);
}
return 0;
}
8
/* 6.16.8.c -- 输入两个浮点数，打印两数之差除以两数之积的结果。*/
#include <stdio.h>
int main()
{
double n1, n2;
while (1)
{
printf("Please enter two floating numbers, "
"seperated by space:\n");
if (scanf("%lf %lf", &n1, &n2))
{
double result = fabs(n1 - n2) / (n1 * n2);
printf("Result is %.2f",
result);
}
printf("Please make sure you entered two floating numbers!\n");
return 0;
}
}
10
/* 6.16.10.c -- 计算平方和 */
#include <stdio.h>
int main()
{
int lower, upper;
while (1)
{
printf("Enter lower and upper integer limits: ");
scanf("%d %d", &lower, &upper);
if (lower >= upper)
break;
int losqr = lower * lower;
int upsqr = upper * upper;
int sum = 0;
for (int current = lower; current <= upper; current++)
{
sum += current * current;
}
printf("The sums of the squares from %d to %d is %d\n", losqr, upsqr, sum);
}
return 0;
}
12
/* 6.16.12.c -- 计算无限序列 */
#include <stdio.h>
#include <math.h>
int main()
{
int count;
while (1)
{
printf("Please enter a iterator count: ");
scanf("%d", &count);
if (count <= 0)
break;
// 第一个序列：1 + 1/2 + 1/3 + ...
{
double sum = 0;
for (int i = 0; i < count; i++)
{
sum += 1.0 / (i + 1);
}
printf("After interating %d times,\n", count);
printf("1 + 1/2 + 1/3 + 1/4 + ... = %.3f\n", sum);
}
// 第二个序列，1 - 1/2 + 1/3 - ...
{
double sum = 0;
for (int i = 0; i < count; i++)
{
sum += pow(-1, i) * 1.0 / (i + 1);
}
printf("1 - 1/2 + 1/3 - 1/4 + ... = %.3f\n", sum);
}
}
return 0;
}
13
/* 6.16.13.c -- 打印2的前8次幂 */
#include <stdio.h>
#include <math.h>
int main()
{
int arr[8];
for (int i = 0; i < 8; i++)
{
arr[i] = pow(2, i + 1);
}
int i = 0;
do
{
printf("%d ", arr[i]);
}
while (++i < 8);
return 0;
}
15
/* 6.16.15.c -- 倒序输出一行 */
#include <stdio.h>
#include <string.h>
int main()
{
char line[256];
printf("Please enter a line:\n");
scanf("%s", line);
int len = strlen(line);
for (int i = len -1; i >= 0; i--)
{
printf("%c", line[i]);
}
return 0;
}
16
/* 6.16.16.c -- 利息计算 */
#include <stdio.h>
#include <math.h>
int main()
{
int year = 1;
double daphne = 100,
deirdre = 100;
while (1)
{
daphne += 100.0 * 0.1;
deirdre *= (1 + 0.05);
if (daphne < deirdre)
{
printf("第%d年超过", year);
break;
}
year++;
}
return 0;
}
18
/* 6.16.18.c -- Dunbar's number */
#include <stdio.h>
#include <string.h>
int main()
{
int friends = 5;
int i = 1;
do
{
friends -= i;
friends *= 2;
printf("第%d周有%d个朋友。\n", i, friends);
i++;
} while (friends <= 150);
return 0;
}
7.12课后作业
1
/* 7.12.1.c -- 捕获用户输入，直到#为止，并输出指定字符被捕获的次数。 */
#include <stdio.h>
#include <string.h>
int main()
{
char ch;
int space = 0,
lb = 0,
other = 0;
while ((ch = getchar()) != '#')
{
switch (ch)
{
case ' ': space++; break;
case '\n': lb++; break;
default: other++; break;
}
}
printf("Space count: %d\n", space);
printf("Line break count: %d\n", lb);
printf("Other characters count: %d\n", other);
return 0;
}
2
/* 7.12.2.c -- 捕获用户输入，直到#为止，并输出所有捕获的字符，一行8个。 */
#include <stdio.h>
#include <string.h>
int main()
{
char cache[100];
char ch;
int i = 0;
while ((ch = getchar()) != '#')
cache[i++] = ch;
int counter = 0;
while (counter < i)
{
char c = cache[counter];
printf("%c-%d ", c, c);
if (++counter % 8 == 0)
printf("\n");
}
return 0;
}
4
/* 7.12.4.c -- 捕获用户输入，直到#为止，并做替换。 */
#include <stdio.h>
#include <string.h>
int main()
{
char cache[100];
char ch;
int i = 0;
int changes = 0;
while ((ch = getchar()) != '#')
{
if (ch == '.')
{
cache[i++] = '!';
changes++;
}
else if (ch == '!')
{
cache[i++] = '!';
cache[i++] = '!';
changes++;
}
else
cache[i++] = ch;
}
printf("共发生了%d次替换。\n", changes);
printf("替换后：\n");
for (int j = 0; j < i; j++)
printf("%c", cache[j]);
return 0;
}
6
/* 7.12.6.c -- 捕获用户输入，直到#为止，打印ei出现的次数。 */
#include <stdio.h>
#include <string.h>
int main()
{
char ch,
lch;
int times = 0;
while ((ch = getchar()) != '#')
{
if (lch == 'e'
&& ch == 'i')
{
times++;
}
lch = ch;
}
printf("There're %d \"ei\".", times);
return 0;
}
7
/* 7.12.7.c -- 打印工资、税金、净收入。 */
#include <stdio.h>
#define PAY 10.00
#define OVERTIME 40
int main()
{
double hours;
printf("Please enter your working hours count per week: ");
scanf("%lf", &hours);
if (hours > OVERTIME)
hours *= 1.5;
double paysum = hours * PAY;
double taxes;
if (paysum <= 300)
taxes = paysum * 0.15;
else if (300 < paysum && paysum <= 450)
taxes = 300 * 0.15 + (paysum - 300) * 0.20;
else
taxes = 300 * 0.15 + 150 * 0.20 + (paysum - 450) * 0.25;
double netincome = paysum - taxes;
printf("工资总额：%.2f\n", paysum);
printf("税金：%.2f\n", taxes);
printf("净收入：%.2f\n", netincome);
return 0;
}
8
/* 7.12.8.c -- 打印工资、税金、净收入2.0 */
#include <stdio.h>
#define OVERTIME 40
int main()
{
double hours;
printf("Please enter your working hours count per week: ");
scanf("%lf", &hours);
while (1)
{
printf("*******************************************************************\n"
"Enter the number corresponding to the desired pay rate or action:\n"
"1) $8.75/hr 2) $9.33/hr\n"
"3) $10.00/hr $) $11.20/hr\n"
"5) quit\n"
"*******************************************************************\n");
int choice;
scanf("%d", &choice);
if (choice == 5)
break;
double pay;
switch (choice)
{
case 1: pay = 8.75; break;
case 2: pay = 9.33; break;
case 3: pay = 10.0; break;
case 4: pay = 11.2; break;
default:
printf("You should enter a number between 1~5.\n");
continue;
}
if (hours > OVERTIME)
hours *= 1.5;
double paysum = hours * pay;
double taxes;
if (paysum <= 300)
taxes = paysum * 0.15;
else if (300 < paysum && paysum <= 450)
taxes = 300 * 0.15 + (paysum - 300) * 0.20;
else
taxes = 300 * 0.15 + 150 * 0.20 + (paysum - 450) * 0.25;
double netincome = paysum - taxes;
printf("工资总额：%.2f\n", paysum);
printf("税金：%.2f\n", taxes);
printf("净收入：%.2f\n", netincome);
}
return 0;
}
9
/* 7.12.9.c -- 打印所有小于等于某数的素数。 */
#include <stdio.h>
#include <stdbool.h>
bool isPrime(int num);
int main()
{
int num;
while (1)
{
printf("Please enter an integer above zero: ");
scanf("%d", &num);
if (num > 0)
break;
}
for (int current =1; current <= num; current++)
{
if (isPrime(current))
printf("%d\n", current);
}
return 0;
}
bool isPrime(int num)
{
if (num == 1 || num == 2)
return false;
for (int i = 2; i < num; i++)
{
if (num % i == 0)
return false;
}
return true;
}
10
/* 7.12.10.c -- 税金种类&税金。 */
#include <stdio.h>
int main()
{
double income;
printf("Please enter your income: ");
scanf("%lf", &income);
int category;
printf("Please enter your tax category: ");
scanf("%d", &category);
double taxes;
double limit;
switch (category)
{
case 1: limit = 17850; break;
case 2: limit = 23900; break;
case 3: limit = 29750; break;
case 4: limit = 14875; break;
default:
printf("Invaid category. Quit.");
return 0;
}
taxes = income >= limit
? 0.15 * limit + 0.28 * (income - limit)
: 0.15 * income;
printf("税金为%.2f", taxes);
return 0;
}
11
/* 7.12.11.c -- */
#include <stdio.h>
#define APRICE 2.05
#define BPRICE 1.15
#define CPRICE 1.09
int main()
{
char cmd;
int apound = 0,
bpound = 0,
cpound = 0;
buy:
while (1)
{
printf("输入指令（a/b/c/q）：");
scanf("%c", &cmd);
switch (cmd)
{
case 'a':
printf("请输入洋蓟磅数：");
scanf("%d", &apound);
goto buy;
case 'b':
printf("请输入甜菜磅数：");
scanf("%d", &bpound);
goto buy;
case 'c':
printf("请输入胡萝卜磅数：");
scanf("%d", &cpound);
goto buy;
case 'q':
goto buy_ok;
}
}
buy_ok:
{
double price = apound * APRICE
+ bpound * BPRICE
+ cpound * CPRICE;
double pounds = apound + bpound + cpound;
double discount = price >= 100 ? 0.05 : 0;
double freight;
if (pounds <= 5)
freight = 6.5;
else if (5 < pounds && pounds <= 20)
freight = 14;
else
freight = 14 + (pounds - 20) * 0.5;
printf("购物信息：\n"
"洋蓟 - %d磅，费用%.2f美元\n"
"甜菜 - %d磅，费用%.2f美元\n"
"胡萝卜 - %d磅，费用%.2f美元\n"
"蔬菜费用 - %.2f美元\n"
"折扣 - %.2f%%\n"
"运费包装费 - %.2f\n"
"总费用 - %.2f",
apound, apound * APRICE,
bpound, bpound * BPRICE,
cpound, cpound * CPRICE,
price,
discount * 100,
freight,
price * (1 - discount) + freight);
}
return 0;
}
