刚学几节c语言想问一下这两道题怎么写

4

#include<stdio.h>
int main()
{
    int c='a'-'A';
    int A,B;
    char a,b;
    scanf("%c %c",&a,&b);
    A=a;B=b;
    if(a<='Z'&&a>='A'||a<='z'&&a>='a')
    {
        if(b<='Z'&&b>='A'||b<='z'&&b>='a')
        {
            if(A<'z')
            {
                A=A+c;
            }
            if(B<'z')
            {
                B=B+c;
            }
            if(A>B)
            {
                printf("%c %c",a,b);
            }
            else
            {
                printf("%c %c",b,a);
            }
        }
        else
        printf("%c is not an English letter",b);
    }
    else
        printf("%c is not an English letter",a);
    return 0;
}

5

#include<stdio.h>
int main()
{
    int n;
    int c;
    scanf("%d",&n);
    c=(n-5)/7;
    if(c>='a'&&c<='z'||c>='A'&&c<='Z')
    {
        printf("%c",c);
    }
    else
    printf("wring!");
    return 0;
}