Compilare: user.cpp: In function ‘int main()’: user.cpp:16:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(r)) ^ user.cpp:19:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(r) && r[i]==' ' || r[i] =='(') ^ user.cpp:19:27: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while(i<strlen(r) && r[i]==' ' || r[i] =='(') ^ user.cpp:40:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(strchr(r+j,')')!=NULL && j<strlen(r)) ^ user.cpp:44:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<strlen(r) && r[j]>='0' && r[j]<='9') ^ user.cpp:13:18: warning: unused variable ‘v’ [-Wunused-variable] char r[1001],v[101][1000],aux[20]; ^ user.cpp:13:31: warning: unused variable ‘aux’ [-Wunused-variable] char r[1001],v[101][1000],aux[20]; ^ user.cpp:15:22: warning: unused variable ‘k’ [-Wunused-variable] long i=0,t=0,j=0,k,z=0,c[100]; ^ user.cpp:15:24: warning: unused variable ‘z’ [-Wunused-variable] long i=0,t=0,j=0,k,z=0,c[100]; ^ user.cpp:15:28: warning: unused variable ‘c’ [-Wunused-variable] long i=0,t=0,j=0,k,z=0,c[100]; ^