《结对-四则运算出题器-测试过程》

为了对这个计算器进行有效地检验，设计了几组测试案例，测试结果如下：

Test No.1: (1.11) = 1.110000

Test No.2: 1.11+2.22-3.33*4.44/5.55 = 0.666000

Test No.3: 1.11+(2.22-3.33)*4.44/5.55 = 0.222000

Test No.4: 1.11+(2.22-3.33)*(4.44+5.55)/6.66 = -0.555000

Test No.5: 1.11*((2.22-3.33)*(4.44+5.55))/(6.66+7.77) = -0.852992

Test No.6: (1.11+2.22)*(3.33+4.44)/5.55*6.66 = 31.048920

Test No.7: (1.11-2.22)/(3.33+4.44)/5.55*(6.66+7.77)/(8.88) = -0.041828

Test No.8: Error: (1.11+2.22)*(3.33+4.44: missing ")", please check your expression

Test No.9: Error: (1.11+2.22)*3.33/0+(34-45): divisor cannot be zero

Test No.10: Error: 12+89^7: invalid character: ^