Compilare: main.cpp: In function 'char adv()': main.cpp:16:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buf,sizeof(char),SIZE,fin); ^ main.cpp: In function 'int main()': main.cpp:44:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d ",&n,&k,&a,&b); ^ main.cpp: In function 'int read()': main.cpp:27:19: warning: 'c' is used uninitialized in this function [-Wuninitialized] while(c!='-' && !(c>='0' && c<='9')) ^~~~~~~~~~~~~~~~~~~