(ps: 学校上学期c语言实验的一个报告，难度上确实不大，但最近整理代码时看到了之前写的，所以就记录下来)

题目要求：

任务 1： 随机产生 1 - 10 之间正整数，出乘法问题，直到学生答对为止。
任务 2： 在任务 1 基础上，当学生答错时，最多给三次机会。
任务 3： 在任务 1 基础上，连做 10 道乘法题，不给机会重做，统计总分、正确率。
任务 4： 在任务 3 基础上，随机产生 10 道四则运算题，不给机会重做，统计总分、正确率。
任务 5： 在任务 4 基础上，若回答正确率低于 75 % ，则再做 10 道题，直到正确率高于 75 % 为止。
任务 6： 在任务 5 基础上，随机生成1~4间随机数，来为学生输入的每一个正确或错误的答案输出不同评价。

代码实现

完整代码跳转↑

main函数 / 菜单

void menu()
{printf("\\n");printf("小学生计算机辅助系统\\n");printf(" * 1. 任务 1：随机产生 1 - 10 之间正整数，出乘法问题，直到学生答对为止。\\n");printf(" * 2. 任务 2：在任务 1 基础上，当学生答错时，最多给三次机会。 \\n");printf(" * 3. 任务 3：在任务 1 基础上，连做 10 道乘法题，不给机会重做，统计总分、正确率。\\n");printf(" * 4. 任务 4：在任务 3 基础上，随机产生 10 道四则运算题，不给机会重做，统计总分、正确率。 \\n");printf(" * 5. 任务 5：在任务 4 基础上，若回答正确率低于 75 % ，则再做 10 道题，直到正确率高于 75 % 为止。\\n");printf(" * 6. 任务 6：在任务 5 基础上，随机生成1~4间随机数，来为学生输入的每一个正确或错误的答案输出不同评价。 \\n");printf(" * 0. 退出程序\\n");printf("* \\n");printf("请输入任务选项:");
}int main()
{int input, flag = 0;menu();while (~scanf("%d", &input)){switch (input) {case 1:taskOne();break;case 2:taskTwo();break;case 3:taskThree();break;case 4:taskFour();break;case 5:taskFive();break;case 6:taskSix();break;case 0:printf("程序退出\\n");flag = 1;break;default:printf("命令错误，程序已结束\\n");break;}if (flag == 1)break;elseprintf("请输入任务选项:");}return 0;
}

部分功能

判断两个数是否相同

int Pending(int a, int b)
{if (a == b){printf("Right!\\n");rightCount++;}else{printf("Wrong!\\n");}return 0;
}

产生随机数函数

int Srand1()//产生1~10
{srand((unsigned int)time(NULL));int i;i = rand() % 10 + 1;return i;
}int Srand2()//产生1~10
{int i;i = rand() % 10 + 1;return i;
}

返回分数 / 计算正答率

//传入算对的题数，返回分数
int StatisticScore(int num)
{int score;score = num * 10;return score;
}//计算答题正确率
double StatisticRate(double num)
{double rate;rate = num / 10;return rate;
}

任务

任务一

由于任务1要求可以重试，所以错误时提示词不一样（要求…）这里不用一开始实现的Pending()，额外写一个

随机产生 1 - 10 之间正整数，出乘法问题，直到学生答对为止。

//任务一
//计算两个数是否相同
int PendingOne(int a, int b)
{if (a == b){printf("Right!\\n");rightCount++;}else{printf("Wrong! Please try again\\n");}return 0;
}void taskOne()
{int a, b, sum, input;do{a = Srand1();b = Srand2();sum = a * b;printf("%d * %d = ", a, b);scanf("%d", &input);PendingOne(sum, input);} while (input != sum);printf("任务结束\\n");
}

任务二

在任务 1 基础上，当学生答错时，最多给三次机会。

void taskTwo()
{srand((unsigned)time(NULL));int flag, count;flag = 0;count = 0;double a, b, sum, input;int c;//用于四则运算switch语句do{a = Srand1();b = Srand2();c = rand() % 4;//c用作随机生成四则运算的标志switch (c){case 0:printf("%.2f/%.2f = ", a, b);sum = a / b;break;case 1:printf("%.2f*%.2f = ", a, b);sum = a * b;break;case 2:sum = a + b;printf("%.2f+%.2f = ", a, b);break;default:printf("%.2f-%.2f = ", a, b);sum = a - b;}scanf("%lf", &input);if (sum == input) {flag++;printf("Right\\n");}else {count++;//最多尝试3次if (count != 3)printf("Wrong! Please try again.\\n");else {printf("Wrong! You have tried three times! Test over!\\n");break;}}} while (flag != 1);flag = count = 0;
}

任务三

在任务 1 基础上，连做 10 道乘法题，不给机会重做，统计总分、正确率。

void taskThree()
{int a, b, sum, input, flag = 0;rightCount = 0;//回答正确个数do {flag++;a = Srand1();b = Srand2();sum = a * b;printf("%d * %d = ", a, b);scanf("%d", &input);Pending(sum, input);} while (flag != 10);int score = StatisticScore(rightCount);//计算总分double rate = StatisticRate(rightCount);//计算正答率printf("得分: %d , 正确率:%.2f\\n", score, rate);
}

任务四

在任务 3 基础上，随机产生 10 道四则运算题，不给机会重做，统计总分、正确率。

void taskFour()
{int c, parameter, sum, flag = 0;double a, b;int score;//分数rightCount = 0;//正答题数double input, rate;do {flag++;a = Srand1();b = Srand2();c = rand() % 4;switch (c) {case 0:printf("%.2f/%.2f = ", a, b);sum = a / b;break;case 1:printf("%.2f*%.2f = ", a, b);sum = a * b;break;case 2:sum = a + c;printf("%.2f+%.2f = ", a, b);break;default:printf("%.2f-%.2f = ", a, b);sum = a - b;}scanf("%lf", &input);Pending(sum, input);} while (flag != 10);//计算并输出分数和正确率score = StatisticScore(rightCount);rate = StatisticRate(rightCount);printf("得分为: %d ,正确率为: %.2f \\n", score, rate);
}

任务五

在任务 4 基础上，若回答正确率低于 75 % ，则再做 10 道题，直到正确率高于 75 % 为止。

void taskFive()
{int c, flag;double a, b, sum, input;rightCount = 0;double rate = 0;do {flag = 0;do {a = Srand1();//a = (double)a;b = Srand2();//b = (double)b;c = rand() % 4;switch (c) {case 0:printf("%.2f/%.2f = ", a, b);sum = a / b;break;case 1:printf("%.2f*%.2f = ", a, b);sum = a * b;break;case 2:sum = a + b;printf("%.2f+%.2f = ", a, b);break;default:printf("%.2f-%.2f = ", a, b);sum = a - b;}scanf("%lf", &input);flag++;Pending(sum, input);} while (flag != 10);int score = StatisticScore(rightCount);//    score = 1.0 * rightCount;rate = StatisticRate(rightCount);printf("分数：%d 正确率：%.2f \\n\\n", score, rate);} while (rate <= 0.75);
}

任务六

在任务 5 基础上，随机生成1~4间随机数，来为学生输入的每一个正确或错误的答案输出不同评价。

void taskSix()
{int c, flag;double a, b, sum, input;rightCount = 0;double rate = 0;do {flag = 0;do {a = Srand1();b = Srand2();c = rand() % 4;switch (c) {case 0:printf("%.2f/%.2f = ", a, b);sum = a / b;break;case 1:printf("%.2f*%.2f = ", a, b);sum = a * b;break;case 2:printf("%.2f+%.2f = ", a, b);sum = a + b;break;default:printf("%.2f-%.2f = ", a, b);sum = a - b;}scanf("%lf", &input);flag++;PendingSix(sum, input);} while (flag != 10);int score = StatisticScore(rightCount);//    score = 1.0 * rightCount;rate = StatisticRate(rightCount);printf("分数：%d 正确率：%.2f \\n\\n", score, rate);} while (rate <= 0.75);
}

完整代码

#include<stdio.h>
#include<stdlib.h>
#include<time.h> //定义正答题数 后面会用到
int rightCount = 0;void menu()
{printf("\\n");printf("小学生计算机辅助系统\\n");printf(" * 1. 任务 1：随机产生 1 - 10 之间正整数，出乘法问题，直到学生答对为止。\\n");printf(" * 2. 任务 2：在任务 1 基础上，当学生答错时，最多给三次机会。 \\n");printf(" * 3. 任务 3：在任务 1 基础上，连做 10 道乘法题，不给机会重做，统计总分、正确率。\\n");printf(" * 4. 任务 4：在任务 3 基础上，随机产生 10 道四则运算题，不给机会重做，统计总分、正确率。 \\n");printf(" * 5. 任务 5：在任务 4 基础上，若回答正确率低于 75 % ，则再做 10 道题，直到正确率高于 75 % 为止。\\n");printf(" * 6. 任务 6：在任务 5 基础上，随机生成1~4间随机数，来为学生输入的每一个正确或错误的答案输出不同评价。 \\n");printf(" * 0. 退出程序\\n");printf("* \\n");printf("请输入任务选项:");
}//判断两个数是否相等
int Pending(int a, int b)
{if (a == b){printf("Right!\\n");rightCount++;}else{printf("Wrong!\\n");}return 0;
}//产生随机数函数
int Srand1()//产生1~10
{srand((unsigned int)time(NULL));int i;i = rand() % 10 + 1;return i;
}int Srand2()//产生1~10
{int i;i = rand() % 10 + 1;return i;
}//传入算对的题数，返回分数
int StatisticScore(int num)
{int score;score = num * 10;return score;
}//计算答题正确率
double StatisticRate(double num)
{double rate;rate = num / 10;return rate;
}//任务一
int PendingOne(int a, int b)
{if (a == b){printf("Right!\\n");rightCount++;}else{printf("Wrong! Please try again\\n");}return 0;
}//任务一
void taskOne()
{int a, b, sum, input;do{a = Srand1();b = Srand2();sum = a * b;printf("%d * %d = ", a, b);scanf("%d", &input);PendingOne(sum, input);} while (input != sum);printf("任务结束\\n");
}//任务二
void taskTwo()
{srand((unsigned)time(NULL));int flag, count;flag = 0;count = 0;double a, b, sum, input;int c;//用于四则运算switch语句do{a = Srand1();b = Srand2();c = rand() % 4;//c用作随机生成四则运算的标志switch (c){case 0:printf("%.2f/%.2f = ", a, b);sum = a / b;break;case 1:printf("%.2f*%.2f = ", a, b);sum = a * b;break;case 2:sum = a + b;printf("%.2f+%.2f = ", a, b);break;default:printf("%.2f-%.2f = ", a, b);sum = a - b;}scanf("%lf", &input);if (sum == input) {flag++;printf("Right\\n");}else {count++;//最多尝试3次if (count != 3)printf("Wrong! Please try again.\\n");else {printf("Wrong! You have tried three times! Test over!\\n");break;}}} while (flag != 1);flag = count = 0;
}//任务三
void taskThree()
{int a, b, sum, input, flag = 0;rightCount = 0;//回答正确个数do {flag++;a = Srand1();b = Srand2();sum = a * b;printf("%d * %d = ", a, b);scanf("%d", &input);Pending(sum, input);} while (flag != 10);int score = StatisticScore(rightCount);//计算总分double rate = StatisticRate(rightCount);//计算正答率printf("得分: %d , 正确率:%.2f\\n", score, rate);
}//任务四
void taskFour()
{int c, parameter, sum, flag = 0;double a, b;int score;//分数rightCount = 0;//正答题数double input, rate;do {flag++;a = Srand1();b = Srand2();c = rand() % 4;switch (c) {case 0:printf("%.2f/%.2f = ", a, b);sum = a / b;break;case 1:printf("%.2f*%.2f = ", a, b);sum = a * b;break;case 2:sum = a + c;printf("%.2f+%.2f = ", a, b);break;default:printf("%.2f-%.2f = ", a, b);sum = a - b;}scanf("%lf", &input);Pending(sum, input);} while (flag != 10);//计算并输出分数和正确率score = StatisticScore(rightCount);rate = StatisticRate(rightCount);printf("得分为: %d ,正确率为: %.2f \\n", score, rate);
}//任务五
void taskFive()
{int c, flag;double a, b, sum, input;rightCount = 0;double rate = 0;do {flag = 0;do {a = Srand1();//a = (double)a;b = Srand2();//b = (double)b;c = rand() % 4;switch (c) {case 0:printf("%.2f/%.2f = ", a, b);sum = a / b;break;case 1:printf("%.2f*%.2f = ", a, b);sum = a * b;break;case 2:sum = a + b;printf("%.2f+%.2f = ", a, b);break;default:printf("%.2f-%.2f = ", a, b);sum = a - b;}scanf("%lf", &input);flag++;Pending(sum, input);} while (flag != 10);int score = StatisticScore(rightCount);//    score = 1.0 * rightCount;rate = StatisticRate(rightCount);printf("分数：%d 正确率：%.2f \\n\\n", score, rate);} while (rate <= 0.75);
}//任务六所使用的判断函数
int PendingSix(int a, int b)
{int c = rand() % 4;if (a == b){switch (c){case 0:printf("Very good!\\n");break;case 1:printf("Excellent!\\n");break;case 2:printf("Nice work!\\n");break;default:printf("Keep up the good work!\\n");break;}rightCount++;}else{switch (c){case 0:printf("No. Please try again.\\n");break;case 1:printf("Wrong. Try once more.\\n");break;case 2:printf("Don't give up.\\n");break;default:printf("Not correct. Keep trying\\n");break;}}return 0;
}//任务六
void taskSix()
{int c, flag;double a, b, sum, input;rightCount = 0;double rate = 0;do {flag = 0;do {a = Srand1();b = Srand2();c = rand() % 4;switch (c) {case 0:printf("%.2f/%.2f = ", a, b);sum = a / b;break;case 1:printf("%.2f*%.2f = ", a, b);sum = a * b;break;case 2:printf("%.2f+%.2f = ", a, b);sum = a + b;break;default:printf("%.2f-%.2f = ", a, b);sum = a - b;}scanf("%lf", &input);flag++;PendingSix(sum, input);} while (flag != 10);int score = StatisticScore(rightCount);//    score = 1.0 * rightCount;rate = StatisticRate(rightCount);printf("分数：%d 正确率：%.2f \\n\\n", score, rate);} while (rate <= 0.75);
}int main()
{int input, flag;flag = 0;menu();while (~scanf("%d", &input)){switch (input) {case 1:taskOne();break;case 2:taskTwo();break;case 3:taskThree();break;case 4:taskFour();break;case 5:taskFive();break;case 6:taskSix();break;case 0:printf("程序退出\\n");flag = 1;break;default:printf("命令错误，程序已结束\\n");break;}if (flag == 1)break;elseprintf("请输入任务选项:");}return 0;
}