Compilare: user.cpp: In function ‘void afis_mat(unsigned int (*)[58], unsigned int)’: user.cpp:49:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<n;i++) ^ user.cpp:51:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<n;j++) ^ user.cpp: In function ‘int main()’: user.cpp:12:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%u",&n); ^ user.cpp:15:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%u",&mat[lvl][lin][col]); ^