Yea here's the complete code:
Code:
#include <stdio.h>
int main(void)
{
    int a, b, num, onesDig, tensDig;


    printf("Enter two two-digit numbers separated by a space: ");
    scanf("%d %d", &a, &b);
    if (a>b){
        a=num;}
    else
        b=num;
    onesDig = num%10;
    tensDig = num/10;
    if (num) {
        switch (num){
            case 10: printf("ten"); break;
            case 11: printf("eleven"); break;
            case 12: printf("twelve"); break;
            case 13: printf("thirteen"); break;
            case 14: printf("fourteen"); break;
            case 15: printf("fifteen"); break;
            case 16: printf("sixteen"); break;
            case 17: printf("seventeen"); break;
            case 18: printf("eighteen"); break;
            case 19: printf("nineteen"); break; }
    }
    else
        if (tensDig!=1) {
            switch (tensDig) {
                case 2: printf("twenty"); break;
                case 3: printf("thirty"); break;
                case 4: printf("forty"); break;
                case 5: printf("fifty"); break;
                case 6: printf("sixty"); break;
                case 7: printf("seventy"); break;
                case 8: printf("eighty"); break;
                case 9: printf("ninety"); break;}
        }

            if (onesDig) {
                switch (onesDig) {
                    case 1: printf("-one"); break;
                    case 2: printf("-two"); break;
                    case 3: printf("-three"); break;
                    case 4: printf("-four"); break;
                    case 5: printf("-five"); break;
                    case 6: printf("-six"); break;
                    case 7: printf("-seven"); break;
                    case 8: printf("-eight"); break;
                    case 9: printf("-nine"); break;}
        }

    return 0;
}
Some sample inputs I tried are 78 45 and it gave me -four
89 78= -eight
52 12 = -six