第六章

6-1

#include<stdio.h>
int main(void)
{
    int i;
    char ch_lower,ch_upper;
    for(i=1;i<=6;i++)
    {
        scanf("%c",&ch_lower);
        if(ch_lower>='a'&&ch_lower<='z')
            ch_upper=ch_lower-'a'+'A';
        printf("%c->%c->%d\n",ch_lower,ch_upper,ch_upper%10);
    }
    return 0;
}

6-2

#include<stdio.h>
int main(void)
{
    char ch='w';
    int a=2,b=3,c=1,d,x=10;

    printf("%d",a>b==c);
    printf("%d",d=a>b);
    printf("%d",ch>'a'+1);
    printf("%d",d=a+b>c);
    printf("%d",b-1==a!=c);
    printf("%d",3<=x<=5);

    return 0;
}

6-3

#include<stdio.h>
int main(void)
{
    char ch='w';
    int a=2,b=0,c=0;
    float x=3.0;

    printf("%d",a&&b);
    printf("%d",a||b&&c);
    printf("%d",!a&&b);
    printf("%d",a||3+10&&2);
    printf("%d",!(x==2));
    printf("%d",!x==2);
    printf("%d\n",ch||b);

    return 0;
}

6-5

#include<stdio.h>
int main(void)
{
    char ch;

    printf("input characters:");
    ch=getchar();

    while(ch!='\n'){
        if(ch>='A'&&ch<='Z')
            ch=ch-'A'+'a';
        else if(ch>='a'&&ch<='z')
            ch=ch-'a'+'A';
        putchar(ch);
        ch=getchar();
    }
    return 0;
}