src.c: In function 'main':
src.c:5:8: error: 'C' undeclared (first use in this function)
c1=C;
^
src.c:5:8: note: each undeclared identifier is reported only once for each function it appears in
src.c:6:8: error: 'h' undeclared (first use in this function)
c2=h;
^
src.c:7:8: error: 'i' undeclared (first use in this function)
c3=i;
^
src.c:8:8: error: 'n' undeclared (first use in this function)
c4=n;
^
src.c:9:8: error: 'a' undeclared (first use in this function)
c5=a;
^