【正确答案】main() { int score; printf(“Please enter score:”); scanf(“/%d”,&score); if(score<0||score>100) printf(“Input error!/n”); else { mark=score/10; switch (mark) { case 10: case 9: printf(“/%d——A/n”,score); break; case 8: printf(“/%d——B/n”,score); break; case 7: printf(“/%d——C/n”,score); break; case 6: printf(“/%d——D/n”,score); break; case 5: case 4: case 3: case 2: case 1: case 0: printf(“/%d——E/n”,score); break; } } }