Challenge

for(i=0; n > 0; n /= 10)
strint[i++] = (n%10)+'0';

for(j=0; j < i/2; j++) {
temp = strint[j];
strint[j] = strint[i-j-1];
strint[i-j-1] = temp;
}
strint[i] = 0;
printf("%s\n", strint);