#include<stdio.h>
int main(){
  int n,num,i;
  int big;
  
  printf("Enter the values of n: ");
  scanf("%d",&n);
 
  printf("Number %d",1);
  scanf("%d",&big);

  for(i=2;i<=n;i++){
    printf("Number %d: ",i);
    scanf("%d",&num);

    if(big<num)
      big=num;
  }
  
  printf("Largest number is: %d",big);

  return 0;
}
Sample Output:
Enter the values of n:
Number 1: 12
Number 2: 32
Number 3: 35
Largest number is: 35

#include<stdio.h>
int main(){
  int num,temp,factor=1;

  printf("Enter a number: ");
  scanf("%d",&num);

  temp=num;
  while(temp){
      temp=temp/10;
      factor = factor*10;
  }

  printf("Each digits of given number are: ");
  while(factor>1){
      factor = factor/10;
      printf("%d ",num/factor);
      num = num % factor;
  }

  return 0;
}
Sample output:
Enter a number: 123
Each digits of given number are: 1 2 3

#include<stdio.h>
int main(){
  int num,count=0;

  printf("Enter a number: ");
  scanf("%d",&num);

  while(num){
      num=num/10;
      count++;
  }
  printf("Total digits is:  %d",count);
  return 0;
}
Sample output:
Enter a number: 23
Total digits is:  2

#include<stdio.h>
int main(){
  int num,count=0;

  printf("Enter a number: ");
  scanf("%d",&num);

  for(;num!=0;num=num/10)
      count++;

  printf("Total digits is:  %d",count);

  return 0;
}
Sample output:
Enter a number: 456
Total digits is:  3

#include<stdio.h>

int countDigits(num);
int main(){
  int num,count;

  printf("Enter a number: ");
  scanf("%d",&num);

  count = countDigits(num);

  printf("Total digits is:  %d",count);
  return 0;
}

int countDigits(int num){
    static int count=0;

     if(num!=0){
          count++;
         countDigits(num/10);
    }

    return count;
}
Sample output:
Enter a number: 1234567
Total digits is:  7