Question

implement two functions in c++ format

1.Convert decimal number to floating point representation (hexa decimal)

2.Convert floating point representation (hexa decimal) to decimal number

Note: We only care about the floating point number in IEEE754 Encoding table below (i.e., exponent 1 – 254).  

-----------------------------------------------------------------------------------------------------------------

void from_decimal_to_floating(){
    char number[10];
    float decimal = 0;
    cout << "Input decimal to convert a hexa decimal number (e.g., 0.4375): ";
    cin >> decimal;
    //write the code here



   
    //end of code 
    cout << decimal << "'s floating point hexa decimal : " << number; 
    cout << endl << "[format]: 0.4375's floating point hexa decimal : 3EE00000" << endl << endl;
} 

void from_floating_to_decimal(){
    char number[10];
    float decimal = 0;
    cout << "Input hexa decimal to convert a decimal number (e.g., 3EE00000): ";
    cin >> number;
    //write the code here



   
    //end of code 
    cout << number << "'s decimal : " << decimal ; 
    cout << endl << "[format]: 3EE00000's decimal : 0.4375" << endl << endl;
} 

Answer 1

Converting decimal to hexadecimal value:
void from_decimal_to_floating(){
    int num, temp, i = 1, j, r;
    char number[10];
    float decimal = 0;
    cout << "Input decimal to convert a hexa decimal number (e.g., 0.4375): ";
    cin >> decimal;
    
    temp = decimal;
    while (temp != 0)
    {
        r = temp % 16;
        if (r < 10)
            number[i++] = r + 48;
        else
            number[i++] = r + 55;
        temp = temp / 16;
    }
    cout << decimal << "'s floating point hexa decimal : " << " is : ";
    for (j = i; j > 0; j--)
        cout << number[j];
} 

Convert Hexadecimal value to decimal :

void from_floating_to_decimal(){
    char number[10];
    float decimal = 0;
    int i, r, len, hex = 0;
    cout << "Input hexa decimal to convert a decimal number : ";
    cin >> number;
    //write the code here
    len = strlen(number);
    for (i = 0; number[i] != '\0'; i++)
    {
        len--;
        if(number[i] >= '0' && number[i] <= '9')
            r = number[i] - 48;
        else if(number[i] >= 'a' && number[i] <= 'f')
                r = number[i] - 87;
             else if(number[i] >= 'A' && number[i] <= 'F')
                    r = number[i] - 55;
        decimal += r * pow(16,len);
    } 
    cout << number << "'s decimal : " << decimal ; 
}