Compilare: user.cpp: In function ‘int getdigit()’: user.cpp:17:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<strlen(x);i++) ^ user.cpp: In function ‘int ro()’: user.cpp:29:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<strlen(x);i++) ^ user.cpp: In function ‘int pa()’: user.cpp:77:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<strlen(x);i++) ^ user.cpp:75:9: warning: unused variable ‘t’ [-Wunused-variable] int t=-1000,nr=0,n=0,semn=1; ^ user.cpp: In function ‘int main()’: user.cpp:121:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(x);i++) ^ user.cpp: In function ‘int ro()’: user.cpp:72:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int pa()’: user.cpp:116:1: warning: control reaches end of non-void function [-Wreturn-type] } ^