agendatelefonica.cpp: In function 'int main()': agendatelefonica.cpp:45: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result agendatelefonica.cpp:48: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result agendatelefonica.cpp:51: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result