Compilare: user.c: In function ‘bun’: user.c:17:7: warning: implicit declaration of function ‘cmp’ [-Wimplicit-function-declaration] if(cmp(ma[i][j], 0) != 0) ^ user.c: In function ‘main’: user.c:60:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:63:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lf", &ma[i][j]); ^