View Compilation Error

0_0_23908449_22430.cpp: In function 'int main()':
0_0_23908449_22430.cpp:5:39: error: label 'w' used but not defined
  while(~scanf("%d%d%d",&a,&w,&z)&&a,&&w,&&z)
                                       ^
0_0_23908449_22430.cpp:5:43: error: label 'z' used but not defined
  while(~scanf("%d%d%d",&a,&w,&z)&&a,&&w,&&z)
                                           ^