BASIC练习题 1995-12-01 10 DIM M(3,3) 20 FOR I=1 To 3 30 FOR J=1 To 3 40 Read M(I,J) 50 NEXT J 60 NEXT I 70 FOR I=2 TO 3 80 FOR J=1 TO 2 90 Let K=M(I,J) 100 Let M(I,J)=M(J,I) 110 Let M(J,I)=K 120 PRINT M(I,J) 130 NEXT J 140 NEXT I 150 DATA 9,8,7,6,5,4,3,2,1 160 ENDA. 5 B. 7 C. 4 D. 8 2.下述程序(设N=10)运行后结果为 (68) 。 10 INPUT N 15 PRINT 20 DIM M(N) 25 LET Y=0 30 FOR I=1 TO N 35 READ X 40 IF X<0 THEN GOSUB 500 45 NEXT I 50 FOR K=1 TO Y 55 PRINT M(K); 60 NEXT K 65 DATA 1,-1.1,2,-2.2,3,-4,5,-2.5,4,-8,-7 70 END500 LET Y=Y+1510 LET M(Y)=-X^2520 RETURNA. -1 -4 -6 -25 -16 B. 1.21 4.84 16 6.25 64C. 1 4 6 25 16 D. -1.21 -4.84 -16 -6.25 -64