IM A NOOB I NEED HELP WITH MY CODE PLS ANYONE HELP ME YOUR HELP WOULD MEAN A LOT :""(((

Question

so i tried making a program that converts hexadecimal number into decimal number and here is my progress so far

https://code.sololearn.com/c3I2be4hYaTw/#cpp

can anyone correct me whats wrong with this code and what should i do next

Answer 1

You have made just a mapping between one hex number to decimal.
You have to make calculations when more than one hex characters are used.

For example :
If the hexadecimal number is 1A.
dec_value = 1*(16^1) + 10*(16^0) = 26

Step 1 : Read char array not single char
Step 2: Create a function converting hex number to dec passign as parameter the char array and return an integer

Inside the function
2a. Find the char array length and initialise dec_val = 0;
2b. Set base variable to 1 (16^0)
2c. Loop array (for (int i=len-1; i>=0; i--))
2c1. if the character is between [0-9] then
dec_val += (hexVal[i] - 48)*base;
else if the character is between [A-F] then
dec_val += (hexVal[i] - 55)*base;
2C2. increase base
base = base*16;
close loop