Compilare: main.cpp: In function 'int main()': main.cpp:45:40: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff,buff_size,1,stdin), pos = 0; ^ main.cpp: In function 'void read(int&)': main.cpp:17:102: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] while(!isdigit(buff[pos])) if(++pos == buff_size) fread(buff,buff_size,1,stdin), pos = 0, pos = 0; ^ main.cpp:22:70: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if(++pos == buff_size) fread(buff,buff_size,1,stdin), pos = 0; ^ main.cpp: In function 'void getChar(char&)': main.cpp:27:96: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] while(!isdigit(buff[pos])) if(++pos == buff_size) fread(buff, 1,buff_size, stdin), pos = 0; ^ main.cpp:29:66: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if(++pos == buff_size) fread(buff,buff_size,1,stdin), pos = 0; ^