View Compilation Error

0_0_15575322_14424.cpp: In function 'int main()':
0_0_15575322_14424.cpp:8:1: error: 'S' was not declared in this scope
 S=1;
 ^
0_0_15575322_14424.cpp:12:7: error: expected ')' before '!' token
 if(k%2!)
       ^