Hexadecimal to Decimal Conversion in C

Run

#include
#include
#include

int convert(char hex[])
{
    int len = strlen(hex);
    int decimal = 0, pos = 0;
    
    for(int i = len - 1; i >= 0; i--)
    {
        // if given index value is a digit (0 - 9)
        if (hex[i] >= '0' && hex[i] <= '9') { // if character is in range '0' - '9' // can convert char value to its int value // by subtracting 48 (Refer Ascii table) as ASCII val 0 : 48 int digit = hex[i] - 48; decimal += digit * pow(16, pos); pos++; } // if given index is char in range [A, F] else if (hex[i] >= 'A' && hex[i] <= 'F') 
        { 
            // if character is in range 'A' - 'F' 
            // can convert char value to its int value 
            // by subtracting 55 (Refer Ascii table) as 
            // ASCII val A : 65 and A must result 10 as value 
            int digit = hex[i] - 55; 
            decimal += digit * pow(16, pos); 
            pos++; 
        } 
    } 
    return decimal; 
}
int main()
{
char hex[20];
scanf("%[^\n]", &hex);

printf("%d",convert(hex));
return 0;
}