View Compilation Error

0_0_31220853_15300.cpp: In function 'int main()':
0_0_31220853_15300.cpp:7:9: error: expected initializer before 'while'
         while(scanf("%d",&n)!=EOF&&n)
         ^
0_0_31220853_15300.cpp:30:1: error: expected '}' at end of input
 }
 ^