Compilare: user.cpp: In function ‘int main()’: user.cpp:18:26: warning: operation on ‘j’ may be undefined [-Wsequence-point] {a[i][++j]=i*a[i][j-1]%10;a[i][0]++; ^ user.cpp:41:35: warning: unknown conversion type character 0xa in format [-Wformat=] if (nr==0) fprintf(f2,"%\n",s[100]); ^ user.cpp:41:35: warning: too many arguments for format [-Wformat-extra-args] user.cpp:36:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d%c",&t,&c); ^ user.cpp:38:17: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {fgets(n,101,f1); ^