Compilare: user.c: In function ‘getVal’: user.c:22:50: warning: variable ‘c’ set but not used [-Wunused-but-set-variable] unsigned short m = (i1 + i2)/2, i, k, b, c; ^ user.c: At top level: user.c:46:6: warning: return type of ‘main’ is not ‘int’ [-Wmain] void main(){ ^ user.c: In function ‘main’: user.c:49:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fi , "%hd %hd %hd\n" , &n , &l , &u ); ^ user.c:53:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fi , "%hd " , &data[0][i] ); ^ user.c:54:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fi , "%hd\n" , &data[0][n] ); ^ user.c:56:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fi , "%hd " , &data[1][i] ); ^ user.c:57:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fi , "%hd" , &data[1][n] ); ^