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Explore Stack Internal#C, 88 bytes
#include<math.h> typedef double d;d g(d x,d y,d a,d b){return atan2(b-y,a-x)*180/M_PI;} Requires compiling with GCC to take advantage of M_PI being defined in math.h as a part of GCC's built-in math constants. Try it online - since ideone doesn't use GCC (apparently), an additional few bytes are needed for enough digits of π to be accurate.
#C, 88 bytes
#include<math.h> typedef double d;d g(d x,d y,d a,d b){return atan2(b-y,a-x)*180/M_PI;} Requires compiling with GCC to take advantage of M_PI being defined in math.h as a part of GCC's built-in math constants. Try it online - since ideone doesn't use GCC (apparently), an additional few bytes are needed for enough digits of π to be accurate.
#include<math.h> typedef double d;d g(d x,d y,d a,d b){return atan2(b-y,a-x)*180/M_PI;} Requires compiling with GCC to take advantage of M_PI being defined in math.h as a part of GCC's built-in math constants. Try it online - since ideone doesn't use GCC (apparently), an additional few bytes are needed for enough digits of π to be accurate.
#C, 8988 bytes
#include<math.h> typedef double d;d g(d x,d y,d a,d b){return( atan2(b-y,a-x))*180/M_PI;} Requires compiling with GCC to take advantage of M_PI being defined in math.h as a part of GCC's built-in math constants. Try it online - since ideone doesn't use GCC (apparently), an additional few bytes are needed for enough digits of π to be accurate.
#C, 89 bytes
#include<math.h> typedef double d;d g(d x,d y,d a,d b){return(atan2(b-y,a-x))*180/M_PI;} Requires compiling with GCC to take advantage of M_PI being defined in math.h as a part of GCC's built-in math constants. Try it online - since ideone doesn't use GCC (apparently), an additional few bytes are needed for enough digits of π to be accurate.
#C, 88 bytes
#include<math.h> typedef double d;d g(d x,d y,d a,d b){return atan2(b-y,a-x)*180/M_PI;} Requires compiling with GCC to take advantage of M_PI being defined in math.h as a part of GCC's built-in math constants. Try it online - since ideone doesn't use GCC (apparently), an additional few bytes are needed for enough digits of π to be accurate.
#C, 9589 bytes
#include<math.h> typedef double d;d g(d x,d y,d a,d b){return(atan2(b,a)-atan2(y,a-x))*180/M_PI;} Requires compiling with GCC to take advantage of M_PI being defined in math.h as a part of GCC's built-in math constants. Try it onlineTry it online - since ideone doesn't use GCC (apparently), an additional few bytes are needed for enough digits of π to be accurate.
#C, 95 bytes
#include<math.h> typedef double d;d g(d x,d y,d a,d b){return(atan2(b,a)-atan2(y,x))*180/M_PI;} Requires compiling with GCC to take advantage of M_PI being defined in math.h as a part of GCC's built-in math constants. Try it online - since ideone doesn't use GCC (apparently), an additional few bytes are needed for enough digits of π to be accurate.
#C, 89 bytes
#include<math.h> typedef double d;d g(d x,d y,d a,d b){return(atan2(b-y,a-x))*180/M_PI;} Requires compiling with GCC to take advantage of M_PI being defined in math.h as a part of GCC's built-in math constants. Try it online - since ideone doesn't use GCC (apparently), an additional few bytes are needed for enough digits of π to be accurate.