Code Simulation to convert hexadecimal to decimal, hexadecimal to decimal

Code Simulation to convert hexadecimal to decimal, hexadecimal to decimal

Public class SexAdecimal {

Private int sum ;//
Private static String s = null; // enter the String to be converted;

Public static void main (String [] args ){

SexAdecimal a = new SexAdecimal ();


A. char_value (s );

}
// -------------------------------- Parses strings -------------------
Public void char_value (String s ){
If (s = null) {// determines if the input is null. if the input is null, there is no need to perform the next operation, and the function is directly terminated.
System. out. println ("enter a hexadecimal string. null is not a string ");
Return;
}
For (int I = 0; I <s. length (); ++ I ){
Char c = s. charAt (s. length ()-1-i); // obtain the string from right to left.
If (int_value (c, I) {// This is based on the input character. if one of the characters is incorrect, the function is terminated and no error results are output.
Return;
}
}
If (sum = 0 ){
Integer sum1 = null;
System. out. println (sum1 );
} Else {
Integer sum1 = sum;
System. out. println (sum1 );
}
}
// ------------------------------------ Parses the string into an integer value ----------------
Public boolean int_value (char c, int N_Ci_Fang) {// convert the character to an integer value.
Int I = 0;
If (c = 'A '){
I = 10;
} Else if (c = 'B '){
I = 11;
} Else if (c = 'C '){
I = 12;
} Else if (c = 'D '){
I = 13;
} Else if (c = 'E '){
I = 14;
} Else if (c = 'F '){
I = 15;
} Else if (c = '0 '){
I = 0;
} Else if (c = '1 '){
I = 1;
} Else if (c = '2 '){
I = 2;
} Else if (c = '3 '){
I = 3;
} Else if (c = '4 '){
I = 4;
} Else if (c = '5 '){
I = 5;
} Else if (c = '6 '){
I = 6;
} Else if (c = '7 '){
I = 7;
} Else if (c = '8 '){
I = 8;
} Else if (c = '9 '){
I = 9;
} Else {
System. out. println ("the maximum value of each user in hexadecimal format is f. Enter 0 ~ Value Between f ");
Return true;
}

Sum_value (I, N_Ci_Fang );
Return false;
}
// ----------------------------------- Calculate the integer value and obtain the decimal value ----------------
Public void sum_value (int value, int N_Ci_Fang ){


// System. out. println (Math. pow (16, 0); // the two parameters in the power 0 of 16 are of the double type.
This. sum + = value * (int) Math. pow (16, N_Ci_Fang );
}
}