Compilare: user.c: In function ‘polar’: user.c:13: warning: suggest explicit braces to avoid ambiguous ‘else’ user.c:16: warning: suggest explicit braces to avoid ambiguous ‘else’ user.c: In function ‘init’: user.c:44: warning: format ‘%f’ expects type ‘float *’, but argument 2 has type ‘double *’ user.c:44: warning: format ‘%f’ expects type ‘float *’, but argument 3 has type ‘double *’ user.c:44: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c: In function ‘main’: user.c:58: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:59: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:60: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c: In function ‘polar’: user.c:20: warning: control reaches end of non-void function