明解C语言入门篇 练习题第11章_void deldigit(char *s)

11-1 

#include <stdio.h>
 
int main(void)
{
	char *p = "123";
 
	printf("p = \"%s\"\n", p);
 
	p = "456"+1;
 
	printf("p = \"%s\"\n", p);
 
	return 0;
}

11-2

#include <stdio.h>
 
int main(void)
{
    char a[][5]= {"LISP","C","Ada"};
    char *p[]= {"PAUL","X","MAC"};
    int q;
    int o;
    q=sizeof(a)/sizeof(a[0]);
    o=sizeof(p)/sizeof(p[0]);
    printf("a数组的字符串个数为%d,  p数组的字符串个数为%d",q,o);
    return 0;
}

11-3

#include <stdio.h>
 
char *str_copy(char *d, const char *s)
{
	char *t = d;
 
	while (*d++ =*s++);
	return t;
}
 
int main(void)
{
	char str[128] = "ABC";
	char tmp[128];
 
	printf("str = \"%s\"\n", str);
 
	printf("复制的是：", tmp);
	scanf("%s", tmp);
 
	puts("复制了。");
	printf("str = \"%s\"\n", str_copy(str, tmp));
 
	return 0;
}

11-4  

#include <stdio.h>
 
void put_string(const char*s)
{
    while(*s)
    {
        printf("%c",*s);
        *s++;
    }
    return;
}
 
int main(void)
{
    char sh[] = "123";
    put_string(sh);
    printf("\n");
    return 0;
}

11-5 

#include <stdio.h>
#include <string.h>
 
int str_chnum(const char*s,int c)
{
    int num=0;
    while(*s)
    {
        if(*s==c)
        {
            num++;
        }
        *s++;
    }
    return num;
}
 
int main(void)
{
    char s[128];
    char c;
    printf("请输入一个字符串:");
    scanf("%s",s);
    getchar();
    printf("请输入一个字符：");
    scanf("%c",&c);
    printf("\n");
    printf("该字符串中%c的个数为：%d\n",c,str_chnum(s,c));
    return 0;
}

11-6

#include <stdio.h>
#include <string.h>
 
int *str_chr(const char*s,int c)
{
    char *t;
    while(*s)
    {
        if(*s==c)
        {
            t=s;
            break;
        }
        else
        {
            t=NULL;
        }
        *s++;
    }
    return t;
}
 
int main(void)
{
    char s[128];
    char c;
    printf("请输入一个字符串:");
    scanf("%s",s);
    getchar();
    printf("请输入一个字符：");
    scanf("%c",&c);
    printf("\n");
    printf("该字符串中%c的指针为：%p\n",c,str_chr(s,c));
    return 0;
}

11-7 

#include <stdio.h>
#include <string.h>
 
void str_toupper(char*s)
{
    while(*s)
    {
        *s=toupper(*s);
        s++;
    }
    return;
}
 
void str_tolower(char*s)
{
    while(*s)
    {
        *s = tolower(*s);
        s++;
    }
    return;
}
 
int main(void)
{
	char s[128];
	printf("请输入一串字符:");
	scanf("%s",s);
 
	printf("变成大写为:");
	str_toupper(s);
	printf("%s",s);
	printf("\n");
 
	printf("变成小写为:");
	str_tolower(s);
	printf("%s",s);
	printf("\n");
 
    return 0;
 
}

11-8

#include <stdio.h>
#include <string.h>
 
void del_digit(char*s)
{
    while(*s)
    {
        if((*s>='a')&&(*s<='z')||(*s>='A')&&(*s<='Z'))
        {
            putchar(*s);
        }
 
        s++;
    }
    return;
}
 
 
 
int main(void)
{
    char s[128];
    printf("请输入一串字符:");
    scanf("%s",s);
 
    printf("删除数字字符后:");
    del_digit(s);
    printf("\n");
 
    return 0;
 
}

11-9 不做

11-10不做