Compilare: user.cpp: In function ‘int main()’: user.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:26:84: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((isdigit(a[i]) && isdigit(a[i+1])==0) or (isdigit(a[i]) && i==strlen(a)-1)) ^ user.cpp:37:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:45:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:142:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:17:29: warning: unused variable ‘ni’ [-Wunused-variable] int s=0,r=0,k=0,max,x,j,ni,s1=0; ^ user.cpp:19:10: warning: variable ‘ultim’ set but not used [-Wunused-but-set-variable] char ultim; ^