src.c: In function 'main':
src.c:6:9: error: redeclaration of 'a' with no linkage
int a=1,b=2;
^
src.c:4:6: note: previous declaration of 'a' was here
int a, b, sum;
^
src.c:6:13: error: redeclaration of 'b' with no linkage
int a=1,b=2;
^
src.c:4:9: note: previous declaration of 'b' was here
int a, b, sum;
^