Compilare: main.cpp: In function 'int sumcf(int)': main.cpp:10:7: warning: unused variable 'i' [-Wunused-variable] int i, s ; ^ main.cpp: In function 'int main()': main.cpp:24:13: warning: variable 'l' set but not used [-Wunused-but-set-variable] int n, i, l, x1, x2, y1, y2, st, val, valst, valdr, s, stot ; ^ main.cpp:24:32: warning: unused variable 'st' [-Wunused-variable] int n, i, l, x1, x2, y1, y2, st, val, valst, valdr, s, stot ; ^~ main.cpp:25:55: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%d%d%d", &n, &x1, &y1, &x2, &y2 ) ; ^