View Compilation Error

0_0_39093710_31984.cpp: In function 'int main()':
0_0_39093710_31984.cpp:12:36: error: 'minnum' was not declared in this scope
   12 |                 for(register int i=minnum;i<100;i+=b)//习惯性的加上了register (寄存器)
      |                                    ^~~~~~