View Compilation Error

0_0_31332059_32083.cpp: In function 'int main()':
0_0_31332059_32083.cpp:6:4: error: expected ';' before 'for'
    for(;a>0;a--)
    ^
0_0_31332059_32083.cpp:6:16: error: expected ';' before ')' token
    for(;a>0;a--)
                ^