LM35 Temperature sensor not able to read correct reading

[Lchal.1]

Hi, i want to display temperature value of LM35 temperature sensor on oled using stm32f103. i selected adc channel . even i am able to read adc reading but it is not varying properly and even i am not able to read exact temperature reading. can anyone help me what i have done wrong . i have attached my code below. if any mistake please tell me or if i need to add anything in my code.

Thank you