Eroare de compilare: user.cpp: In function ‘int comp(const void*, const void*)’: user.cpp:6: error: ‘strcmp’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:17: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:22: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:63: error: ‘strcpy’ was not declared in this scope user.cpp:98: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:112: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:129: error: ‘strlen’ was not declared in this scope user.cpp:136: error: ‘qsort’ was not declared in this scope user.cpp:16: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result