View Compilation Error

0_0_15352340_24305.cpp: In function 'int main()':
0_0_15352340_24305.cpp:5:26: error: expected ')' before 'a'
 while(scanf("%d%d",&a,&b)a&&b)
                          ^
0_0_15352340_24305.cpp:5:30: error: expected ';' before ')' token
 while(scanf("%d%d",&a,&b)a&&b)
                              ^