打印26个字幕解决方案

打印26个字幕
请问这段代码有什么问题呢？

C/C++ code

#include <stdio.h>int main(void){    const int SIZE = 26;    char arr;    int j;    for(j = 'A';j < ('A' + SIZE);j++)        printf("%3c",arr);    printf("\n");    return 0;}

C/C++ code

#include<stdio.h>int main(void){    const int SIZE = 26;    char arr = 0;    int j;    for(j = 'A';j < ('A' + SIZE);j++)        printf("%3c",arr + j);    printf("\n");    return 0;}
[解决办法]
C/C++ code
    const int SIZE = 26;    char arr;    int j;    for(j = 'A';j < ('A' + SIZE);j++)    {        arr = j;        printf("%c",arr);    }    printf("\n");