Compilare: main.cpp: In function 'int main()': main.cpp:38:43: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d %d %d\n", &v, &m, &n); ^ main.cpp:41:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%c", &c); ^ main.cpp:97:12: warning: 'lit' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf( fout, "%d %d\n%c", ln, col, lit+'a'-1); ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~