aju, C++ (gcc) - rextester

aju

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void func(char *num)
{
	int len = strlen(num);

if (len == 0) {
		fprintf(stderr, "empty string\n");
		return;
	}
	if (len > 4) {
		fprintf(stderr, "Length more than 4 is not supported\n");
		return;
	}

char *single_digits[] = { "zero", "one", "two", "three", "four",
							"five", "six", "seven", "eight", "nine"};

char *two_digits[] = {"", "ten", "eleven", "twelve", "thirteen", "fourteen",
					"fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};

char *tens_multiple[] = {"", "", "twenty", "thirty", "forty", "fifty",
							"sixty", "seventy", "eighty", "ninety"};

char *tens_power[] = {"hundred", "thousand"};
	printf("\n%s: ", num);

if (len == 1) {
		printf("%s\n", single_digits[*num - '0']);
		return;
	}

while (*num != '\0') {

if (len >= 3) {
			if (*num -'0' != 0) {
				printf("%s ", single_digits[*num - '0']);
				printf("%s ", tens_power[len-3]); // here len can be 3 or 4
			}
			--len;
		}

else {
			if (*num == '1') {
				int sum = *num - '0' + *(num + 1)- '0';
				printf("%s\n", two_digits[sum]);
				return;
			}

else if (*num == '2' && *(num + 1) == '0') {
				printf("twenty\n");
				return;
			}

else {
				int i = *num - '0';
				printf("%s ", i? tens_multiple[i]: "");
				++num;
				if (*num != '0')
					printf("%s ", single_digits[*num - '0']);
			}
		}
		++num;
	}
}

int main(void)
{
    int i=0,l,n;
    char c,s[5];
    scanf("%d",&n);
    while(n>0)
    {
        s[i]=n%10+48;
        n/=10;
        i++;
    }
    l=i;
    s[i]='\0';
    for(i=0;i<l/2;i++)
     {
         c=s[i];
         s[i]=s[l-1-i];
         s[l-1-i]=c;
     }
  //  printf("%s",s);
    func(s);
	return 0;
}


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