Compilare: user.cpp: In function ‘int main()’: user.cpp:17:59: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] for(l1=1;(s1[l1-1]>='A'&&s1[l1-1]<='Z')||s1[l1-1]>='a'&&s1[l1-1]<='z';l1++) ^ user.cpp:19:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%c",&s1[l1]); ^ user.cpp:25:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%c",&s2[l2]); ^