Compilare: user.c: In function ‘main’: user.c:117:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d %d", &N, &M, &L, &C); ^ user.c:120:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &grains[i][j]); ^ user.c: In function ‘zOne’: user.c:17:13: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i, j, c, l = 0, s = 0, min = MAX_VAL; ^ user.c: In function ‘zTwo’: user.c:41:13: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i, j, c, l = 0, s = 0, min = MAX_VAL; ^ user.c: In function ‘zThree’: user.c:65:13: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i, j, c, l = 0, s = 0, min = MAX_VAL; ^ user.c: In function ‘zFour’: user.c:89:13: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i, j, c, l = 0, s = 0, min = MAX_VAL; ^