~cpp #include<iostream> using namespace std; void main(){ int i; char a[5] ={0,}; do{ cout << " :"; cin >> i; if(i==999) continue; else if(i<0 || i>100){ cout << " " <<endl; continue; } switch(i/10){ case 10: case 9: a[0] +=1; break; case 8: a[1] +=1; break; case 7: a[2] +=1; break; case 6: a[3] +=1; break; default: a[4] +=1; break; } }while(!(i==999)); for(i=0;i<4;i++) printf("%c:%d\n",'A'+i,a[i]); printf("F:%d\n",a[4]); }