View Compilation Error

0_0_9731208_851.cpp: In function `int main(int, char**)':
0_0_9731208_851.cpp:12: error: `s' undeclared (first use this function)
0_0_9731208_851.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9731208_851.cpp:12: error: `i' undeclared (first use this function)
0_0_9731208_851.cpp:14: error: `t' undeclared (first use this function)