View Compilation Error

0_0_6964067_5940.cpp: In function `int main()':
0_0_6964067_5940.cpp:5: error: redeclaration of `int a'
0_0_6964067_5940.cpp:4: error: `int a' previously declared here
0_0_6964067_5940.cpp:5: error: redeclaration of `int b'
0_0_6964067_5940.cpp:4: error: `int b' previously declared here
0_0_6964067_5940.cpp:5: error: redeclaration of `int sum'
0_0_6964067_5940.cpp:4: error: `int sum' previously declared here