Question

How to insert input digits into int array in C

Answer 1

#include <stdio.h> 
 
#define ARR_SIZE 100

int main(void)
{   
    char ch;
    int arr[ARR_SIZE] = {0};
    int i = 0;

    while ( ( ch = getchar()) != EOF  &&  ch != '\n' &&  i < ARR_SIZE ) 
    {
        if (ch >= '0' && ch <= '9')
            arr[i++] = ch - '0';
    }
        
    for (int j = 0; j < i; j++)
        printf("%d\n", arr[j]);
    
    return 0;
}

   
/*
run:

1234567890
1
2
3
4
5
6
7
8
9
0

*/

 

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Answer 2

#include <stdio.h> 
 
#define ARR_SIZE 100

int main(void)
{   
    char ch;
    int arr[ARR_SIZE] = {0};
    int i = 0;

    while ( ( ch = getchar()) != EOF  &&  ch != '\n' &&  i < ARR_SIZE ) 
    {
        if (ch >= '0' && ch <= '9')
            arr[i++] = ch - '0';
    }
        
    for (int j = 0; j < i; j++)
        printf("%d\n", arr[j]);
    
    return 0;
}

   
/*
run:

12AB4567CDX89
1
2
4
5
6
7
8
9

*/

 

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