Compilare: user.cpp: In function ‘bool check(line)’: user.cpp:119: warning: comparison between signed and unsigned integer expressions user.cpp:142: warning: comparison between signed and unsigned integer expressions user.cpp:147: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:186: warning: comparison between signed and unsigned integer expressions user.cpp:188: warning: comparison between signed and unsigned integer expressions user.cpp:203: warning: comparison between signed and unsigned integer expressions user.cpp:230: warning: comparison between signed and unsigned integer expressions user.cpp:243: warning: comparison between signed and unsigned integer expressions user.cpp:257: warning: comparison between signed and unsigned integer expressions user.cpp:180: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:182: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result