Trying to reverse my for-loops (creating a hourglass)

Question

I'm trying to create an hourglass, It seems as if my spacing for the reverse for-loop is messing up, and I don't know how I would remove the extra 5 without messing up the for-loop.

My code

#include <stdio.h>
#include <math.h>

int main(){

long long number;

printf("Enter a long number\n");
printf("Enter your number = ");
scanf("%lld", &number);


for(int j=1; j<= (log10(number)+1); j++){

    for(int i=1; i<= (log10(number)+1) - (j-1); i++){
       printf("%d   ", (number%((int)pow(10, i)))/(int)pow(10, i-1));
    
   }

printf("\n");
printf("%*s", 2*j-1, "  ");

}

for(int j=(log10(number)+1); j>=1; j--){
    
    for(int i=(log10(number)+1)-(j-1); i>=1 ; i--){
        printf("%d   ", (number%((int)pow(10, i)))/(int)pow(10, i-1));
    
   }
   
printf("\n");
printf("%*s", 2*j-1, "  ");

}



   return 0;
}

---

My output:

Enter a long number                                                                                                                             
Enter your number = 12345                                                                                                                       
5   4   3   2   1                                                                                                                               
  5   4   3   2                                                                                                                                 
   5   4   3                                                                                                                                    
     5   4                                                                                                                                      
       5                                                                                                                                        
         5                                                                                                                                      
         4   5                                                                                                                                  
       3   4   5                                                                                                                                
     2   3   4   5                                                                                                                              
   1   2   3   4   5                                                                                                                            
                       

What would be the best way for removing the extra 5 on top, and what did I do wrong with the spacing?

---

What I'm trying to output:

Enter a long number
Enter your number = 12345
5   4   3   2   1
  5   4   3   2
    5   4   3
      5   4
        5   
      4   5
    3   4   5
  2   3   4   5
1   2   3   4   5

Answer 1

You should indent your rows before writing the numbers. For the second loop, skip the first row.

Try this code:

#include <stdio.h>
#include <math.h>

int main(){

    long long number;
    
    printf("Enter a long number\n");
    printf("Enter your number = ");
    scanf("%lld", &number);

    for(int j=1; j<= (log10(number)+1); j++){
    
        printf("%*s", 2*(j-1), "");  // indent row
        for(int i=1; i<= (log10(number)+1) - (j-1); i++){
           printf("%d   ", (number%((int)pow(10, i)))/(int)pow(10, i-1));
        
        }
    
       printf("\n");
    }


    for(int j=(log10(number)+1)-1; j>=1; j--){
        
        printf("%*s", 2*(j-1), "");  // indent row
        for(int i=(log10(number)+1)-(j-1); i>=1 ; i--){
            printf("%d   ", (number%((int)pow(10, i)))/(int)pow(10, i-1));
        }
       
       printf("\n");
    }
   return 0;
}

Output

Enter a long number
Enter your number = 12345
5   4   3   2   1   
  5   4   3   2   
    5   4   3   
      5   4   
        5   
      4   5   
    3   4   5   
  2   3   4   5   
1   2   3   4   5