i have no idea how to do floating point comparison this is c programming

CHALLENGE 3.16.1: Floating-point comparison: Print Equal or Not equal Write an expression that will cause the following code to print "Equal" if the value of sensorReading is "close enough" to targetValue. Otherwise, print "Not equal". Ex: If targetValue is 0.3333 and sensorReading is (1.0/3.0), output is Equal 1 #include 4 int main(void)f 6 8 scanf("%lf", &targetValue); 1 test passed double targetValue; double sensorReading; All tests passed 9 canf("S1f", &sensorReading); 11 if (/* Your solution goes here */) { printf("Equal "); 13 14 else printf("Not equal "); 16 17 18 19 return 0 Run