一、实验目的
（1） 掌握变量、函数的使用
（2） 掌握选择结构、循环结构的使用
（3） 熟悉模块化程序设计的方法
二、实验仪器或设备
微型计算机
三、总体设计（设计原理、设计方案及流程等）
设计一个简单的小学生计算机辅助教学系统，帮助小学生学习四则运算。使用模块化程序设计方法，利用函数实现各模块功能。
提示：参照第7章课后题7.14，从任务1到任务6，实现循序渐进的方式编程。
四、实验步骤（包括主要步骤、代码分析等）
五、结果分析与总结
#include <stdio.h> #include <stdlib.h> #include <time.h> int Magic(int m); int main() { int answer, answer1; int counter =0; do { answer = Magic(1) * Magic(2); printf("%d*%d=", Magic(1), Magic(2)); scanf("%d", &answer1); if (answer == answer1) { printf("Right!\n"); break; } else { printf("Wrong| Please try again.\n"); } } while (counter <= 1); //提示学生重做，直到答对为止 return 0; } int Magic(int m) //随机赋值两个1-10的数 { srand(time(NULL)); int x = rand() % 10 + 1; int y = rand() % 10 + 1; if (m == 1) return x; else if (m == 2) return y; else return -1; }//返回随机数
#include <stdio.h> #include <stdlib.h> #include <time.h> int Magic(int m); int main() { int answer, answer1; int counter =1; do { answer = Magic(1) * Magic(2); printf("%d*%d=", Magic(1), Magic(2)); scanf("%d", &answer1); if (answer == answer1) { printf("Right!\n"); break; } if (counter == 3) { printf("You have three time|Test over\n"); break; } else { printf("Wrong| Please try again.\n"); } counter++; } while (counter <=3); return 0; } int Magic(int m) { srand(time(NULL)); int x = rand() % 10 + 1; int y = rand() % 10 + 1; if (m == 1) return x; else if (m == 2) return y; else return -1; }
#include <stdio.h> #include <stdlib.h> #include <time.h> int Magic(int m); int main() { int answer, answer1; int counter = 1; int a=0, b=0; int score; float rate; do { answer = Magic(1) * Magic(2); printf("%d*%d=", Magic(1), Magic(2)); scanf("%d", &answer1); if (answer == answer1) { printf("Right!\n"); a++; } else { printf("Wrong!\n"); b++; } counter++; } while (counter <= 10); score = a * 10; rate = (float)a / 10; printf("score=%d\n", score); printf("rate=%.1f%%\n", rate*100); return 0; } int Magic(int m) { srand(time(NULL)); int x = rand() % 10 + 1; int y = rand() % 10 + 1; if (m == 1) return x; else if (m == 2) return y; else return -1; }
#include <stdio.h> #include <stdlib.h> #include <time.h> double Magic(int m); int main() { double answer, answer1; int counter = 1; int a = 0, b = 0; int score, c; float rate; do { c = rand() % 4; switch (c) { case 0: answer = Magic(1) / Magic(2); printf("%.1f/%.1f=", Magic(1), Magic(2)); break; case 1: answer = Magic(1) + Magic(2); printf("%.1f+%.1f=", Magic(1), Magic(2)); break; case 2: answer = Magic(1) - Magic(2); printf("%.1f-%.1f=", Magic(1), Magic(2)); break; case 3: answer = Magic(1) * Magic(2); printf("%.1f*%.1f=", Magic(1), Magic(2)); break; } scanf("%lf", &answer1); if (answer == answer1) { printf("Right!\n"); a++; } else { printf("Wrong!\n"); b++; } counter++; } while (counter <= 10); score = a * 10; rate = (float)a / 10; printf("score=%d\n", score); printf("rate=%.1f%%\n", rate * 100); return 0; } double Magic(int m) { srand(time(NULL)); int x = rand() % 10 + 1; int y = rand() % 10 + 1; if (m == 1) return x; else if (m == 2) return y; else return -1; }
#include <stdio.h> #include <stdlib.h> #include <time.h> double Magic(int m); int main() { double answer, answer1; int counter = 0; int a = 0, b = 0; int score, c; float rate; do { counter = 0; do { c = rand() % 4; switch (c) { case 0: answer = Magic(1) / Magic(2); printf("%.1f/%.1f=", Magic(1), Magic(2)); break; case 1: answer = Magic(1) + Magic(2); printf("%.1f+%.1f=", Magic(1), Magic(2)); break; case 2: answer = Magic(1) - Magic(2); printf("%.1f-%.1f=", Magic(1), Magic(2)); break; case 3: answer = Magic(1) * Magic(2); printf("%.1f*%.1f=", Magic(1), Magic(2)); break; } scanf("%lf", &answer1); if (answer == answer1) { printf("Right!\n"); a++; } else { printf("Wrong!\n"); b++; } counter++; rate = (float)a / 10; } while (counter != 10); score = a * 10; printf("score=%d\n", score);//score表示为分数。 printf("rate=%.1f%%\n", rate * 100);//rate表示为正确率。 } while (rate <= 0.75); return 0; } double Magic(int m) { srand(time(NULL)); int x = rand() % 10 + 1; int y = rand() % 10 + 1; if (m == 1) return x; else if (m == 2) return y; else return -1; }
#include <stdio.h> #include <stdlib.h> #include <time.h> double Magic(int m); int main() { double answer, answer1; int counter = 1; int a = 0, b = 0; int score, c; float rate; do { counter = 0; do { c = rand() % 4; switch (c) { case 0: answer = Magic(1) / Magic(2); printf("%.1f/%.1f=", Magic(1), Magic(2)); break; case 1: answer = Magic(1) + Magic(2); printf("%.1f+%.1f=", Magic(1), Magic(2)); break; case 2: answer = Magic(1) - Magic(2); printf("%.1f-%.1f=", Magic(1), Magic(2)); break; default: answer = Magic(1) * Magic(2); printf("%.1f*%.1f=", Magic(1), Magic(2)); break; } scanf("%lf", &answer1); if (answer == answer1) { c = rand() % 4; 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; } a++; } else { c = rand() % 4; 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; } b++; } counter++; rate = (float)a / 10; } while (counter != 10); score = a * 10; printf("score=%d\n", score); printf("rate=%.1f%%\n", rate * 100); } while (rate <= 0.75); return 0; } double Magic(int m) { srand(time(NULL)); int x = rand() % 10 + 1; int y = rand() % 10 + 1; if (m == 1) return x; else if (m == 2) return y; else return -1; }
