Compilare: user.cpp: In function ‘int main()’: user.cpp:69:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘void afis()’: user.cpp:103:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mexc.out","w",stdout); ^ user.cpp: In function ‘int gi()’: user.cpp:119:54: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pos>=maxb) fread(buf,maxb,1,stdin),pos=0; ^ user.cpp:123:54: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pos>=maxb) fread(buf,maxb,1,stdin),pos=0; ^ user.cpp: In function ‘void read()’: user.cpp:131:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mexc.in","r",stdin); ^