Compilare: user.cpp: In function ‘int transf_nr(int)’: user.cpp:13:48: 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:14:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[i]>='0'&&s[i]<='9' && i<strlen(s)) ^ user.cpp: In function ‘bool egal(int, int)’: user.cpp:27:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<strlen(a[i]);++k) if(a[i][k]!=a[j][k]) return 0; ^ user.cpp: In function ‘int main()’: user.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);++i) ^ user.cpp:41:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[j]==' ' && j<strlen(s)) ^ user.cpp:48:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);++i) ^ user.cpp:53:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);) ^ user.cpp:99:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<strlen(a[i]);++j) g<<a[i][j]; ^