sqrt() function not working with variable arguments [duplicate]

Answer 1

include math library using " " operator

#include " math.h "

compile program using -lm option for inherit math library suppose our program name is test.c the we compile as follow

gcc test.c -lm

Answer 2

Use the command gcc -Wall -o "test2" "test2.c" -lm which will likely fix this.

This includes the math library in addition to the standard C runtime library. On most systems, the math library is historically a separate entity that needs to be explicitly requested.