View Compilation Error

989418_0_0_15505.cpp: In function `int main()':
989418_0_0_15505.cpp:18: error: `sqrt' undeclared (first use this function)
989418_0_0_15505.cpp:18: error: (Each undeclared identifier is reported only once for each function it appears in.)
989418_0_0_15505.cpp:19: error: expected `;' before "for"
989418_0_0_15505.cpp:19: error: expected `;' before ')' token