Question

What I’m trying to do is have the user input a number, and then the program reads each digit back in word form. For example:

Input: 517

Output: Five One Seven

It’s a simple command-line tool, using NSLogs and scanf to get the input and provide output, nothing too advanced. I have the jist of it, but it only works with one-digit numbers:

    #import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {
    @autoreleasepool {

        int number;

        NSLog(@"Type your number.");
        scanf("%i", &number);


        if (number == 0) {
            NSLog(@"Zero");
        } else if (number == 1){
            NSLog(@"One");
        } else if (number == 2) {
            NSLog(@"Two");
        } else if (number == 3) {
            NSLog(@"Three"); 
        } else if (number == 4) {
            NSLog(@"Four");
        } else if (number == 5) {
            NSLog(@"Five");
        } else if (number == 6) {
            NSLog(@"Six");
        } else if (number == 7) {
            NSLog(@"Seven");
        } else  if (number == 8) {
            NSLog(@"Eight");
        } else if (number == 9) {
            NSLog(@"Nine");
        } 

    }
    return 0;
}

However, I’m having problems working with more digits. I was thinking of using something like this to split them up:

            right_digit = number % 10;
        NSLog(@"%i", right_digit);
        number /= 10;

But that would output backwards.

Any advice?

Thanks

Answer 1

Use Recursion

void printNumber(int a){
  if(a/10 > 0){
     printNumber(a/10);
  }

  int digit = a%10;
  switch(digit){
  {
    case 0:
       NSLog(@"Zero ");
       break;
    case 1:
       NSLog(@"One ");
       break;
    case 2:
       NSLog("Two ");
       break;
     ....
  }

}