Compilare: user.cpp: In function ‘int main()’: user.cpp:83:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) { ^ user.cpp: In function ‘int reduc(int&)’: user.cpp:26:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:81:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s",a); ^ user.cpp: In function ‘int parantp(int&)’: user.cpp:47:32: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(v[i]!=',') {v[++l]=k; k=reduc(i);} ^