Compilare: user.cpp: In function ‘void read(long int&, long int&, long int&, long int)’: user.cpp:31:19: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘long int*’ [-Wformat=] scanf("%d", &t); ^ user.cpp:34:37: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘long int*’ [-Wformat=] scanf("%d %d %d", &x, &y, &c); ^ user.cpp:34:37: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘long int*’ [-Wformat=] user.cpp:34:37: warning: format ‘%d’ expects argument of type ‘int*’, but argument 4 has type ‘long int*’ [-Wformat=] user.cpp: In function ‘long int cmmdc(long int, long int)’: user.cpp:11:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘void read(long int&, long int&, long int&, long int)’: user.cpp:31:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:34:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &c); ^ user.cpp: In function ‘int main()’: user.cpp:49:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("euclid3.in", "r", stdin); ^ user.cpp:52:19: warning: ‘c’ is used uninitialized in this function [-Wuninitialized] read(t,x,y, c); ^