Compilare: main.c: In function 'readInt': main.c:9:11: warning: implicit declaration of function 'isspace' [-Wimplicit-function-declaration] while ( isspace( ch = fgetc( fin ) ) ); ^~~~~~~ main.c:12:11: warning: implicit declaration of function 'isdigit' [-Wimplicit-function-declaration] while ( isdigit( ch = fgetc( fin ) ) ); ^~~~~~~ main.c:8:20: warning: unused variable 'semn' [-Wunused-variable] int ch, res = 0, semn = 1; ^~~~