题目如图：

这里不再赘述

代码：

//字符串中统计与查询

//杨鑫

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define MAXN 1000

char Str[MAXN];

/*

 *寻找字符串中最大的整数

 * */

int maxnum_string(char str[])

{

	int i = 0, n = 0, maxNum = 0;

	while(str[i] != '\0')

	{

		if(str[i] >= '0' && str[i] <= '9')

				n = n * 10 + str[i] - '0';

		else

		{

			if(maxNum < n)

					maxNum = n;

			n = 0;

		}

		i++;

	}

	if(maxNum < n)

			maxNum = n;

	return maxNum;

}

/*

 *功能：统计字符串中的数字

 * */

int count_number_string(char str[])

{

	int i = 0, count = 0;

	while(str[i] != '\0')

	{

		if(str[i] >= '0' && str[i] <= '9')

		{

			if(str[i+1] < '0' || str[i+1] > '9')

			{

					count++;

			}

		}

		i++;

	}

	return count;

}

int main()

{

	int i = 0, count_main = 0, max = 0;

	printf("请输入一个字符串: ");

	gets(Str);

	printf("字符串的内容: ");

	puts(Str);

	count_main = count_number_string(Str);

	printf("字符串一共同拥有:%d个数字,", count_main);

	max = maxnum_string(Str);

	printf("最大数字为:%d\n", max);

	return 0;

}

结果：

watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxMjk2NTM3Mw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="">