在C中的Char数组中存储整数

Question

Im doing some work for Uni and wrote a programm which stores Integers in an char Array and converts them to their ASCII Values and prints them at the end. My code did not work before and only started working when i changed "%c" to "%i" in my scanf line. My question: Why does it have to be "%i" when i wanna store those Numbers in an char Array and not an Int Array. Thanks!

My code:

#include <stdio.h>

int main()
{

    int i; /counter
    char numbers[12];
    printf("Please enter 12 Numbers\n");
    for(i = 0; i < 12; i++){
        printf("please enter the  %i. Number\n", i+1);
        scanf("%i", &numbers[i]);// <-- changed "%c" to "%i" and it worked.why?

    }
    for(i = 0; i < 12;i++){
        printf("The %i.ASCII value is %i and has the Char %c\n", i+1, numbers[i], numbers[i]);
    }




    return 0;
}

Answer 1

%c is for reading a single character. So for example if you type in "123" , scanf will read '1' into the char variable and leaves the rest in the buffer.

On the other side %i is the specifier for int and will therefore lead to undefined behavior when trying to read in a char .

I think what you are looking for is the %hhi specifier, which reads a number into a char variable.