Compilare: user.cpp: In function ‘void add(int, int)’: user.cpp:9: warning: suggest parentheses around arithmetic in operand of ‘^’ user.cpp: In function ‘int suma(int, int)’: user.cpp:18: warning: suggest parentheses around arithmetic in operand of ‘^’ user.cpp:23: warning: suggest parentheses around arithmetic in operand of ‘^’ user.cpp: In function ‘int gas(int)’: user.cpp:39: warning: suggest parentheses around ‘+’ inside ‘<<’ user.cpp:40: warning: suggest parentheses around ‘+’ inside ‘<<’ user.cpp: In function ‘int main()’: user.cpp:51: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:52: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:61: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:66: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:72: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:78: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result