Compilare: user.cpp: In function ‘int transf_nr(int)’: user.cpp:16:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s[i+1]>='0'&&s[i+1]<='9' && i+1<strlen(s)) ^ user.cpp:17:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[i]>='0'&&s[i]<='9' && i<strlen(s)) ^ user.cpp: In function ‘int main()’: user.cpp:31:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);++i) ^ user.cpp:36:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[j]==' ' && j<strlen(s)) ^ user.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);++i) ^ user.cpp:67:9: warning: unused variable ‘gasit’ [-Wunused-variable] int gasit; ^