View Compilation Error

0_0_18573982_8982.cpp:9:11: error: stray '\' in program
           printf("%lf", (4\3) * PI * r * r * r)
           ^
0_0_18573982_8982.cpp: In function 'int main()':
0_0_18573982_8982.cpp:9:28: error: expected ')' before numeric constant
           printf("%lf", (4\3) * PI * r * r * r)
                            ^
0_0_18573982_8982.cpp:11:5: error: expected ')' before '}' token
     }
     ^