Convert Char to int/long/double

Projects General Guidance
1

Good Evening!
I am experiencing problem regarding conversion of char data type to int, I am using Current Transformer analogue reading to be printed to 16x4 LCD, for that I had to do some calculation stuff, but now to calculate KWh, i have to use that Current value but i could not use it because of it to be char type. Kindly see my code and suggest me possible ways out of it. Thank you!

Code:
int c11=A0;
long tempc;
long tempReading1;
long i1;
char d1=0;
char d2=0;
char d3=0;
char d4=0;
void setup() {
Serial.begin(9600);

}

void CT()
{
tempReading1 = analogRead(c11);
tempc = tempReading1 * 5000 / 1024;
i1=tempc;

lcd.setCursor(0,1);
Serial.print("CURRENT=");
d1=tempc/1000;
d2=(tempc/100)%10;
d3=(tempc/10)%10;
d4=d1+d2+d3;
lcd.print(d1+48);
lcd.print('.');
lcd.print(d2+48);
lcd.write(d4+48);
lcd.println('A');
}

2

Post ALL your code, and use code tags ("</>" button on post editor).

An "int" variable should suffice for a temperature.

Try

lcd.print(tempc);