I see 6.5 Electrical Characteristics for LMx24 and LM324K in datasheet，i do not understand output current，As shown above
for example ：1.when VCC = 15V,VO=0V,i think that if VO>0, output current is sink and is not source，why ?
2. ,I do not understand VID=1V,because V+ = V-, vid = 0V,why?
3. when VCC = 15V,VO=15V,i think that output current is source ,is not sink. why?
4. when VCC = 15V,VO=15V, I think vo range(VICR) :0---VDD-1.5V,and do not up to VDD,why?
Thanks a lot!