//decimal number system
let decimal = 42;

//octal number system
let octal = 0o42;
//octal is 34

//hexadecimal number system
let hex = 0x42;
//hexadecimal is 66

//binary number system
let binary = 0b1010;
//binary is 10

//42 to decimal string
let s_decimal = decimal.to_string();
//sDecimal is "42"

//42 to octal string
let s_octal = format!("{:o}", decimal);
//sOctal is "52"

//42 to hexadecimal string
let s_hex = format!("{:x}", decimal);
//sHexadecimal is "2a"

//42 to binary string
let s_binary = format!("{:b}", decimal);
//sBinary is "101010"

println!("decimal is {decimal}");
println!("octal is {octal}");
println!("hex is {hex}");
println!("binary is {binary}");
println!("s_decimal is {s_decimal}");
println!("s_octal is {s_octal}");
println!("s_hex is {s_hex}");
println!("s_binary is {s_binary}");