Compilare: user.cpp: In function ‘int main()’: user.cpp:26:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d\n",&p); ^ user.cpp:27:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d\n",&m,&n); ^ user.cpp:31:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&c[i][j]); ^ user.cpp:32:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"\n"); ^ user.cpp:98:14: warning: ‘sum’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<sum; ^ user.cpp:88:40: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(g,"%d %d\n%c",x,y,k); ^