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use std::error::Error; const OPERATOR_DIVIDE:char = '/'; const OPERATOR_DIVIDE_BY_ZERO:char = '0'; const OPERATOR_SUBTRACT:char = '-'; const OPERATOR_ADDITION:char = '+'; fn main() { let mut number1:i32; let mut number2:i32; let mut operator:char; let mut result:Result<i32, Box<dyn Error>>; /* Adding Add 10 + 3 = 13 */ number1 = 10; number2 = 3; operator = OPERATOR_ADDITION; result = calc(operator, number1, number2); println!( "{:0?} {:1?} {:2?} is {:3?}" , number1 , operator , number2 , result ); /* Subtract Add 10 - 8 = 2 */ number1 = 10; number2 = 8; operator = OPERATOR_SUBTRACT; result = calc(operator, number1, number2); println!( "{:0?} {:1?} {:2?} is {:3?}" , number1 , operator , number2 , result ); /* Divide Add 10 / 2 = 2 */ number1 = 10; number2 = 2; operator = OPERATOR_DIVIDE; result = calc(operator, number1, number2); println!( "{:0?} {:1?} {:2?} is {:3?}" , number1 , operator , number2 , result ); /* Divide Add 10 / 0 ??? */ number1 = 10; number2 = 0; operator = OPERATOR_DIVIDE; result = calc(operator, number1, number2); println!( "{:0?} {:1?} {:2?} is {:3?}" , number1 , operator , number2 , result ); } fn calc ( operator:char , number1:i32 , number2:i32 )-> Result<i32, Box<dyn Error>> { //declare variables let result:i32; //if operator is adding if operator == OPERATOR_ADDITION { result = number1 + number2; } //if operator is subtract else if operator == OPERATOR_SUBTRACT { result = number1 - number2; } //if operator is divide else if operator == OPERATOR_DIVIDE { result = number1 / number2; } //if operator is divide by 0 else if operator == OPERATOR_DIVIDE_BY_ZERO { //result = number1 / 0; result =0; } //else set result to zero (0) else { result = 0; } //return OK indicator and result return Ok(result); }

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