View Compilation Error

0_0_26469485_22395.cpp: In function 'int main()':
0_0_26469485_22395.cpp:7:2: error: expected ';' before 'while'
  while(a=b-1)
  ^
0_0_26469485_22395.cpp:14:2: error: expected ';' before 'return'
  return 0;
  ^