View Compilation Error

0_0_6712510_9032.cpp: In function `int main()':
0_0_6712510_9032.cpp:155: error: missing terminating ' character
0_0_6712510_9032.cpp:160: error: `sqr' undeclared (first use this function)
0_0_6712510_9032.cpp:160: error: (Each undeclared identifier is reported only once for each function it appears in.)