S1E16：拾遗 | 课后测试题及答案,《带你学C带你飞》（语法篇）,C\C++交流,鱼C论坛

920974324 发表于 2021-4-26 19:29:50

396861085 发表于 2021-4-26 20:30:38

111

Izare 发表于 2021-4-26 22:40:21

{:10_277:}

shuoliuchina 发表于 2021-4-27 00:35:37

测试题
0. 10 个
1. 不打印 B
2. a、b、c 都是
3. a = 14，b = 5，c = 9
4.
#include <stdio.h>

int main(void)
{
int x, z;

printf("请输入一个整数：");
scanf("%d", &x);

if (x >= 0) {
z = x;
} else {
z = -x;
}

printf("%d 的绝对值是：%d\n", x, z);

return 0;
}

5
A. #include <stdio.h>

int main(void)
{
int size, flag = 1;
float cost = 1.0, bill = 0.0;

printf("请输入size：");
scanf("%d", &size);

// 带 goto 版本
if (size > 12) {
goto a;
}
goto b;
a: cost = cost * 1.05;
flag = 2;
b: bill = cost * flag;
printf("带 goto 版本：cost = %f, flag = %d, bill = %f\n", cost, flag, bill);

cost = 1, flag = 1, bill = 0;
// 不带 goto 版本
if (size > 12) {
cost = cost * 1.05;
flag = 2;
}
bill = cost * flag;
printf("不带 goto 版本：cost = %f, flag = %d, bill = %f\n", cost, flag, bill);

return 0;
}

B.#include <stdio.h>

int main(void)
{
int ibex, sheds, help;

printf("请输入ibex：");
scanf("%d", &ibex);

// 带 goto 版本
if (ibex > 14) {
goto a;
}
sheds = 2;
goto b;
a: sheds = 3;
b: help = 2 * sheds;
printf("help = %d\n", help);

// 不带 goto 版本
if (ibex > 14) {
sheds = 3;
} else {
sheds = 2;
}
help = 2 * sheds;
printf("help = %d\n", help);

return 0;
}

C
#include <stdio.h>

int main(void)
{
int score, count = 0;

// 带goto版本
readin: scanf("%d", &score);
if (score < 0) {
goto stage2;
}
count ++;
goto readin;
stage2: printf("count = %d\n", count);

// 不带goto版本
count = 0;
while (scanf("%d", &score), !(score < 0)) {
count++;
}
printf("count = %d\n", count);

return 0;
}

动动手
0.
#include <stdio.h>

int main(void)
{
float x_money = 10000.0, h_money = 10000.0;
int years = 0;

while (x_money >= h_money)
{
years++;
x_money += 10000.0 * 0.1;
h_money *= 1.05;
}
printf("%d年后，黑夜的投资额超过小甲鱼！\n", years);
printf("小甲鱼的投资额是：%.2f\n", x_money);
printf("黑夜的投资额是：%.2f\n", h_money);

return 0;
}

1.
#include <stdio.h>

int main(void)
{
float money = 4000000.0;
int years = 0;

while (money > 0) {
years++;
money -= 500000.0;
money *= 1.08;
}
printf("%d年后，笑甲鱼败光了所有的家产，再次回到一贫如洗……\n", years);

return 0;
}

2.
#include <stdio.h>

int main(void)
{
double item, quarter_pi;
int num, sign;

for (num = 1, sign = 1; (item = 1.0 / num) >= 1e-8; num += 2, sign = -sign) {
quarter_pi += sign * item;
}

printf("Pi小数点后前7位为：%.7f\n", quarter_pi * 4);

return 0;
}

3.
#include <stdio.h>

int main(void)
{
int f_1 = 1, f_2 = 1, cur, month;

for (month = 22; month > 0; month -= 1) {
cur = f_1 + f_2;
f_1 = f_2;
f_2 = cur;
}

printf("两年后的兔子总计%d对\n", cur);

return 0;
}

齐语发表于 2021-4-27 17:53:55

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快乐男 发表于 2021-4-27 20:07:42

！

Eltnevergiveup 发表于 2021-4-27 20:10:41

check

大吊萌妹 发表于 2021-4-27 20:32:52

我有个朋友

dupr11h 发表于 2021-4-27 21:32:00

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磬三爷 发表于 2021-4-27 22:01:27

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Abinla 发表于 2021-4-27 23:27:50

0、100
1、9
2、（a = b = c）
3、a =14,b = 5,c = 9
4、
#include <stdio.h>

int main()
{
int x, z;

printf("请输入数字（求绝对值）:");
scanf("%d", &x);

if(x >= 0)
{
z = x;
}
else
{
z = x * (-1);
}

printf("绝对值为:%d", z);

return 0;
}
5、
A、if(size > 12)
{
cost = cost * 1.05;
flag = 2;
}
bill = cost * flag;
B、
if(ibex > 14)
{
sheds = 3;
}
shed = 2;
help = 2 * sheds;
C、
while(1)
{
scanf("%d", &score);

if(score < 0)
{
printf("count = %d\n", count);
}
count++;
}
动动手：
0、
#include <stdio.h>

int main()
{
float x, h; //x表示小甲鱼所拥有的钱,h表示黑夜所拥有的钱
int count = 0;

x = h = 10000;

while(x >= h)
{
x = x + 10000 * 0.1;
h = h + h * 0.05;
count++;
}

printf("%d年后，黑夜的投资额超过小甲鱼。\n");
printf("小甲鱼的投资额是：%.2f\n", x);
printf("黑夜的投资额是：%.2f\n", h);

return 0;
}
1、
#include <stdio.h>

int main()
{
float money = 4000000;
int count = 0;

while(money >= 0)
{
money = money - 500000;
money = money + money * 0.08;
count++;
}

printf("%d年之后,小甲鱼败光了所有的家产，再次回到一贫如洗....", count);

return 0;
}
2、
#include <stdio.h>
#include <math.h>

int main()
{
float result = 0;
float i = 1;
int count = 1;

while(fabs((1 / i)) > pow(10, -7))
{
result = result + (1 / i * count);
count = -count;
i = i + 2;
}

printf("Pi的近似值为%.7f", 4 * result);

return 0;
}
3、

wake193 发表于 2021-4-28 23:25:21

0、 10
1、 0个
2、 a
3、 14,5,9
4、 z=(x>=0)?x:-x;
5、
A、
if(size > 12)
{
   cost = cost * 1.05;
   flag = 2;
}
bill = cost * flag;
B、
if (ibex > 14)
{
sheds = 3;
}
else
{
sheds = 2;
}
help = 2 * sheds;

C、
do
{
scanf("%d", &score);
if(score < 0)
{break;}
count++;
}while(1);
printf("count = %d\n", count);

动动手：
0、
1 #include <stdio.h>
2
3 #define BENJIN 10000
4 #define DLTZ 0.1
5 #define FHLX 0.05
6
7 int main(void)
8 {
9       double xjy=BENJIN, hy=BENJIN;
10       int n=0;
11       while(xjy >= hy)
12       {
13             xjy = xjy + BENJIN * DLTZ;
14             hy = hy + hy * FHLX;
15             n++;
16       }
17       printf("%d年后，黑夜的投资额超过小甲鱼！\n", n);
18       printf("小甲鱼的投资额是：%.2lf\n", xjy);
19       printf("黑夜的投资额是：%.2lf\n", hy);
20
21       return 0;
22 }

1、
1 #include <stdio.h>
2
3
4 #define BENJIN 4000000
5 #define DLTZ 0.08
6
7 int main(void)
8 {
9       double xjy=BENJIN;
10       int n=0;
11       while(xjy > 0)
12       {
13             xjy -= 500000;
14             xjy = xjy + xjy * DLTZ;
15
16             n++;
17       }
18       printf("%d年后，小甲鱼败光了所有的家产，再次一贫如洗……\n", n);
19
20       return 0;
21 }

2、
1 #include <stdio.h>
2 #include <math.h>
3
4 int main(void)
5 {
6       int n=1;
7       double pi = 1, i = 1;
8       do
9       {
10             i = -i;
11             n += 2;
12             pi = pi + i / n;
13       }while (fabs(i/n) >= pow(10, -8));
14       pi = 4 * pi;
15       printf("PI = :%.7lf", pi);
16
17       return 0;
18 }

3、
46368对

李python 发表于 2021-4-30 16:10:45

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WZX_GUM 发表于 2021-5-1 15:26:09

酱油王 发表于 2021-5-1 16:00:27

老银来学习 发表于 2021-5-3 11:56:35

Wzzhxy1 发表于 2021-5-3 20:29:41

1102510916 发表于 2021-5-4 14:47:34

517620540 发表于 2021-5-4 14:56:57

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vivego 发表于 2021-5-4 16:33:36

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