Compilare: user.c: In function ‘main’: user.c:10:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d" ,&n,&m); ^ user.c:13:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d" ,&mat[i][j]); ^ user.c:24:28: warning: ‘cm’ may be used uninitialized in this function [-Wmaybe-uninitialized] mat[lm][cm]=mat[lm][cm]+m*n; ^ user.c:24:28: warning: ‘lm’ may be used uninitialized in this function [-Wmaybe-uninitialized]