Compilare: user.cpp: In function ‘int getdigit()’: user.cpp:19:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(isdigit(x[i])&&i<strlen(x)) ^ user.cpp: In function ‘int pa()’: user.cpp:78:9: warning: unused variable ‘t’ [-Wunused-variable] int t=-1000,nr=0,n=0,semn=1; ^ user.cpp: In function ‘int main()’: user.cpp:126:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(x);i++) ^ user.cpp:137:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==strlen(x)) ^