Compilare: user.cpp: In function ‘int main()’: user.cpp:99:50: warning: operation on ‘k’ may be undefined [-Wsequence-point] col_prec[++k] = (short int)stack[k-1]; ^ user.cpp:123:50: warning: operation on ‘k’ may be undefined [-Wsequence-point] col_prec[++k] = (short int)stack[k-1]; ^ user.cpp:69:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%hu",&v); ^ user.cpp:70:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%hu %u %u",&n,&st,&dr); ^ user.cpp:74:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%u",&x); ^