将一个字符串中的大写字母和数字复制到另一个字符串中，然后分别输出两个字符串

Question

 

Answer 1

#include<stdio.h>
#include<string.h>
int main(void)
{

    char s1[100],s2[100],i,j;
    gets(s1);
    for(j=i=0;s1[i];i++)
        if(s1[i]<='z' && s1[i]>='a' || s1[i]<='9' && s1[i]>='0')
            s2[j++]=s1[i];
    s2[j]='\0';
    printf("%s\n",s1);
    printf("%s\n",s2);
    return 0;

}