Error in comparing a code in C [duplicate]

I'm starting in C learning and am having trouble with the following code: '

float piValue;
float userAnswerPI;
char userAnswerYN;

piValue = 3.1416;

printf("What's the value of PI?");
scanf("%f", &userAnswerPI);

// Analisando a resposta do valor de PI
if(userAnswerPI !=3.14||userAnswerPI !=3.1416) {
    printf("Are you sure?");
    scanf(" %c", userAnswerYN);
} 

system("pause");
return 0;

' When I add the values 3.14 in the scanf or the value 3.1416, the if is triggered and it was not supposed to happen, please help me: /