Compilare: user.cpp: In function ‘int main()’: user.cpp:18:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:20:84: 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:26:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:14:27: warning: unused variable ‘j’ [-Wunused-variable] int s=0,r=0,k=0,max,x,j; ^