实验5 循环结构程序设计(参考答案)

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实验五 循环结构程序设计（参考答案）

[实验任务一]：

程序跟踪调试实例5-1：error5_1.c参考答案

程序跟踪调试实例5-2：error5_2.c参考答案

程序跟踪调试实例5-3：factor.c参考答案

[实验任务二]：

程序填空实例5-1：for_c.c参考答案

程序填空实例5-1：while_c.c参考答案

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程序填空实例5-1：do_while.c参考答案

程序填空实例5-2：aliqout1.c参考答案

程序填空实例5-2：aliqout2.c参考答案

程序填空实例5-3：diamond.c参考答案

程序填空实例5-5：aliquot3.c参考答案

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[实验任务三]：

编程实例5-1：while2.c参考答案

编程实例5-1：until.c参考答案

编程实例5-2：picture1.c参考答案

编程实例5-2：picture2.c参考答案

[实验任务四]：

设计程序实例5-1：zuhe.c参考答案（第一种方法）

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设计程序实例5-1：zuhe.c参考答案（第二种方法）

设计程序实例5-2：comma.c参考答案

设计程序实例5-3：traffic.c参考答案

设计程序实例5-4：magic.c参考答案

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设计程序实例5-5：guess1.c参考答案

#include <stdio.h> #include <stdlib.h>

#include <time.h> /*将函数time所需要的头文件time.h包含到程序中*/

main() {

int magic; /*计算机“想”的数*/ int guess; /*人猜的数*/

srand(time(NULL)); /*用标准库函数srand为函数rand设置随机数种子*/ magic = rand() % 100 + 1; printf(“Please guess a magic number:”); scanf(“%d”, &guess);

if (guess > magic) {

printf(“Wrong!Too high!\n”); }

else if (guess < magic) {

printf(“Wrong!Too low!\n”); }

else {

printf(“Right!\n”);

printf(“The number is:%d\n”, magic); } }

程序运行结果如下：

Please guess a magic number:40↙ Wrong!Too low!

设计程序实例5-5：guess2.c参考答案

#include <stdio.h> #include <stdlib.h>

#include <time.h>

main() {

int magic; /*计算机"想"的数*/ int guess; /*人猜的数*/

int counter; /*记录人猜的次数*/

srand(time(NULL));

magic = rand() % 100 + 1; counter = 0; do {

printf("Please guess a magic number:"); scanf("%d", &guess); counter ++; if (guess > magic) {

printf("Wrong!Too high!\n"); }

else if (guess < magic) {

printf("Wrong!Too low!\n");

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}

}

}while (guess != magic); /*直到人猜对为止*/ printf("Right!\n");

printf("counter = %d\n", counter);

程序运行结果如下：

Please guess a magic number:50↙ Wrong!Too low!

Please guess a magic number:90↙ Wrong!Too high!

Please guess a magic number:70↙ Wrong!Too high!

Please guess a magic number:60↙ Wrong!Too high!

Please guess a magic number:55↙ Wrong!Too high!

Please guess a magic number:52↙ Right!

counter = 6

设计程序实例5-5：guess3.c参考答案

#include <stdio.h> #include <stdlib.h> #include <time.h>

void main() {

int magic; /*计算机"想"的数*/ int guess; /*人猜的数*/

int counter; /*记录人猜的次数*/

srand(time(NULL));

magic = rand() % 100 + 1; counter = 0; do {

printf("Please guess a magic number:"); scanf("%d", &guess); counter ++; if (guess > magic) {

printf("Wrong!Too high!\n"); }

else if (guess < magic) {

printf("Wrong!Too low!\n"); } else {

printf("Right!\n"); }

}while ((guess!=magic) && (counter<10));/*猜不对且未超过10次时继续猜*/

printf("counter = %d\n", counter); }

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程序两次测试的运行结果分别如下：

①Please guess a magic number:50↙ Wrong!Too low!

Please guess a magic number:80↙ Wrong!Too high!

Please guess a magic number:60↙ Wrong!Too high!

Please guess a magic number:55↙ Right!

counter = 4

②Please guess a magic number:40↙ Wrong!Too low!

Please guess a magic number:90↙ Wrong!Too high!

Please guess a magic number:80↙ Wrong!Too high!

Please guess a magic number:70↙ Wrong!Too high!

Please guess a magic number:60↙ Wrong!Too high!

Please guess a magic number:55↙ Wrong!Too high!

Please guess a magic number:50↙ Wrong!Too high!

Please guess a magic number:45↙ Wrong!Too high!

Please guess a magic number:44↙ Wrong!Too high!

Please guess a magic number:43↙ Wrong!Too high! counter = 10

设计程序实例5-5：guess4.c参考答案

#include <stdio.h> #include <stdlib.h> #include <time.h> main() {

int magic; /*计算机"想"的数*/ int guess; /*人猜的数*/

int counter; /*记录人猜的次数*/ char reply; /*用户键入的回答*/

srand(time(NULL)); do {

magic = rand() % 100 + 1; counter = 0; do

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}

{

printf("Please guess a magic number:"); scanf("%d", &guess); counter ++; if (guess > magic) {

printf("Wrong!Too high!\n"); }

else if (guess < magic) {

printf("Wrong!Too low!\n"); } else {

printf("Right!\n"); }

}while ((guess!=magic) && (counter<10));/*猜不对且未超过10次时继续猜*/ printf("counter = %d\n", counter);

printf("Do you want to continue(Y/N or y/n)?"); scanf("%1s", &reply);