Compilare: user.cpp: In function ‘int main()’: user.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);i++) ^ user.cpp:23:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=i+1;i<strlen(s) && ((s[i]>='a' && s[i]<='z')||(s[i]>='0' && s[i]<='9'));i++) cuv[++p]=s[i]; ^ user.cpp:50:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=i+1;i<strlen(s) && ((s[i]>='A' && s[i]<='Z')||(s[i]>='0' && s[i]<='9'));i++) cuv[++p]=s[i]; ^ user.cpp:70:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<strlen(s) && ((s[i]>='A' && s[i]<='Z')||(s[i]>='0' && s[i]<='9'));i++) cuv[++p]=s[i]; ^