《明解C语言第3版.入门篇》练习代码第11章_明解c语言入门篇第11章答案-优快云博客

本文链接：https://blog.youkuaiyun.com/zhangcao2017/article/details/78656557

这篇博客展示了如何使用C语言编写一个程序，该程序从用户输入的字符串中删除所有的数字字符。通过`del_digit`函数实现，该函数遍历字符串并移除0到9之间的数字。在主函数中，程序接收用户输入，调用`del_digit`函数处理字符串，然后输出处理后的结果。

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练习11-1
#include <stdio.h>

int main(void){
	char *p = "123";
	printf("p=\"%s\"\n", p);
	p = "456";
	printf("p=\"%s\"\n", p);

	return 0;
}

练习11-2

#include <stdio.h>

int count(const char*c){
	int n = 0;
	while (*c++)
		n++;
	return n;
}
int main(void)
{
	int  i;
	int n = 0;
	char a[][5] = { "LISP", "C", "Ada" };
	char *p[] = { "PAUL", "X", "MAC" };


	for (i = 0; i <count(a); i++)
		printf("a[%d] = \"%s\"\n", i, a[i]);

	for (i = 0; i < count(p); i++)
		printf("p[%d] = \"%s\"\n", i, p[i]);

	return 0;
}

练习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;
}

练习11-4

#include <stdio.h>

void put_string (const char *s)
{
	while (*s)
		putchar(*s++);
		
}

int main(void)
{
	char str[128] = "ABC";
	
	 put_string(str);

	return 0;
}

练习11-5

#include <stdio.h>
int str_chnum(const char *s, int c)
{
	int n = 0;
	while (*s){
		if (*s == c)
			n++;
		*s++;
	}
	return (n);
}


int main(void)
{
	char ch='d';
	char str[128] = "ABBBBBBBBBBBBBBBCCCCCCCCCCCCCAAAAAAAAAAAAAAAAC";

	printf("C的个数是：%d",str_chnum(str,ch));

	return 0;
}

练习11-7

#include <ctype.h>
#include <stdio.h>

void str_toupper(char *s)
{
	int i = 0;
	while (*s) {
		*s = toupper(*s);
		*s++;
	}
}


void str_tolower(char *s)
{
	int i = 0;
	while (s) {
		s[i] = tolower(s[i]);
		i++;
	}
}

int main(void)
{
	char str[128];

	printf("请输入字符串：");
	scanf("%s", str);

	str_toupper(str);
	printf("大写字母：%s\n", str);

	str_tolower(str);
	printf("小写字母：%s\n", str);

	return 0;
}

练习11-8

# include <stdio.h>

void del_digit(char *str)
{
	char *p = str;

	while (*p)
	if (*p >= '0' && *p <= '9')
		p++;
	else
		*str++ = *p++;

		*str = '\0';
}

int main(void){
	char str[128];
	printf("请输入字符串：");
		scanf("%s", str);
		del_digit(str);
	printf("删除数字后为：%s", str);
	return 0;
}