Найти сумму максимальной и минимальной цифры

#include <stdio.h>
 
int main(void)
{
    int n, m, min, max, sum;
    min = 10;
    max = 0;
    scanf("%i", &n);
    do {
        m = n % 10;
        n = n / 10;
        if (min > m)
            min = m;
        if (max < m)
            max = m;
    } while (n != 0);
    sum = min + max;
    printf("Min:\n%i\n", min);
    printf("Max:\n%i\n", max);
    printf("Summa:\n%i\n", sum);
    return 0;
}

#include <stdio.h>
 
unsigned min_digit(unsigned n) {
    if ( n < 10 )
        return n;
    else {
        unsigned next = min_digit(n / 10);
        unsigned last = n % 10;
        return ( last < next ) ? last : next;
    }
}
 
unsigned max_digit(unsigned n) {
    if ( n < 10 )
        return n;
    else {
        unsigned next = max_digit(n / 10);
        unsigned last = n % 10;
        return ( last > next ) ? last : next;
    }
}
 
unsigned min_max_digits_sum(unsigned n) {
    unsigned sum = 0;
    unsigned minDigit = min_digit(n);
    unsigned maxDigit = max_digit(n);
    
    for ( ; n; n /= 10 ) {
        unsigned last = n % 10;
        if ( last == minDigit || last == maxDigit )
            sum += last;
    }
    
    return sum;
}
 
int main(void) {
    unsigned n;
    
    while ( printf("Number: ") && scanf("%u", &n) == 1 ) 
        printf("Min digit: %u; max digit: %u; sum of all of them: %u\n",
            min_digit(n), max_digit(n), min_max_digits_sum(n));
    
    return 0;
}

#include<stdio.h>
 
 
int main(){
 
int n;
printf("Enter number: ");
scanf("%d",&n);
int max, min, t = n, maxCount = 0, minCount = 0;
max = min = t%10;
while(t){
        if(max < t%10) max = t%10;
        if(min > t%10) min = t%10;
        t=t/10;
}
printf("max = %d and min = %d\n", max, min);
 
t=n;
 
while(t){
 
        if(max == t%10) maxCount++;
        if(min == t%10) minCount++;
        t=t/10;
}
printf("max is found %d time(s), min is found %d time(s)\n",maxCount, minCount);
printf("The result of programm is %d\n", max*maxCount + min*minCount);
 
return 0;
}

#include<stdio.h>
 
int main(){
int n;
printf("Enter number: ");
scanf("%d",&n);
int max, min, t = n, maxCount = 0, minCount = 0;
max = min = t%10;
if(t<10){
        printf("The result of programm is %d\n", t);
}else{
while(t){
        if(max < t%10) max = t%10;
        if(min > t%10) min = t%10;
        t=t/10;
}
printf("max = %d and min = %d\n", max, min);
 
t=n;
while(t){
 
        if(max == t%10) maxCount++;
        if(min == t%10) minCount++;
        t=t/10;
}
printf("max is found %d time(s), min is found %d time(s)\n",maxCount, minCount);
printf("The result of programm is %d\n", max*maxCount + min*minCount);
}
return 0;
}