Arduino data type conversion (single chip) detailed introduction _android

Arduino Data type Conversion

How to easily play Arduino SCM, when I was in the data conversion, encountered a problem, try C language and C + + many functions, did not achieve the float data conversion to char type. After hard access to the data, finally found a great god-level function!!!            DTOSTRF (), you can easily implement data types from float to char. Get it

The format is as follows:

char* DTOSTRF (double _val,signed char _width, unsigned char prec, char* _s)

Parameter description:

_val: float or Double value to convert.

_width: The integer part length after conversion.

_prec: The length of the decimal part after conversion.

_s: Save to the char array.

Examples are as follows:

float f=3.1415; 
Char  c[]; 
DTOSTRF (f,1,2,c); 
Serial.println (c); 

At this time from the Arduino from the serial monitor will output 3.14, that is, the successful implementation of data type conversion.

After data conversion, we can make a concatenation of the strings. as follows, the concatenation of strings will be implemented

float f=3.1415; 
Char  c[]; 
DTOSTRF (f,1,2,c); 
Serial.println (c); 
Defines a string 
char s[]= "///sensor1///ly///sensor1///pm2.5///100.70///"; 
The string concatenation operation 
strcat (s,c); 
Serial.println (s); 

At this time will be in the Arduino with a serial monitor in the output///sensor1///ly///sensor1///pm2.5///100.70///3.14, that is, the successful implementation of the string stitching.

Special Note: Arduino can directly call the C language in the strcat () function to achieve the concatenation of strings.

Thank you for reading, I hope to help you, thank you for your support for this site!