View Compilation Error

0_0_26233346_26190.cpp: In function 'int main()':
0_0_26233346_26190.cpp:6:8: error: expected primary-expression before 'if'
  while(if(scanf("%d %d",&a,&b))!=-1))
        ^
0_0_26233346_26190.cpp:6:8: error: expected ')' before 'if'
0_0_26233346_26190.cpp:6:32: error: expected primary-expression before '!=' token
  while(if(scanf("%d %d",&a,&b))!=-1))
                                ^