第6章习题源代码.rar

#include <stdio.h> #include <stdlib.h> #include <time.h> int main(void) { int a, b, userAnswer, systemAnswer; int op; char opChar; int i, rightType, wrongType; int rightNumber = 0; int flag = 0; srand(time(NULL)); do{ for (i=0; i<10; i++) { a = rand()%10+1; b = rand()%10+1; op = rand()%4+1; rightType = rand()%4 + 1; wrongType = rand()%4 + 1; switch (op) /* 判断运算符号 */ { case 1: opChar = '+'; systemAnswer = a + b; break; case 2: opChar = '-'; systemAnswer = a - b; break; case 3: opChar = '*'; systemAnswer = a * b; break; case 4: opChar = '/'; systemAnswer = a / b; break; default: printf("Unknown operator!"); } printf("%d %c %d = ?\n", a, opChar, b); scanf("%d", &userAnswer); if (userAnswer == systemAnswer) { switch (rightType) { case 1: printf("Very good!\n"); break; case 2: printf("Excellent!\n"); break; case 3: printf("Nice work!\n"); break; case 4: printf("Keep up the good work!\n"); break; default: printf("Wrong type!"); } rightNumber++; } else { switch (wrongType) { case 1: printf("No. Please try again.\n"); break; case 2: printf("Wrong. Try once more.\n"); break; case 3: printf("Don't give up!\n"); break; case 4: printf("Not correct. Keep trying.\n"); break; default: printf("Wrong type!"); } } } printf("Total score is %d\n", rightNumber*10); printf("Rate of correctness is %d%%\n", rightNumber*10); if (rightNumber*10 < 75) { printf("Once Again!\n"); rightNumber = 0; flag = 1; } }while (flag); return 0; }