題目：輸入一個(gè)字符串，找出字符串中最長(zhǎng)數(shù)字

#include<stdio.h>char num_long(char *str); int main(void){	char str[100];	PRintf("Please input a string with numbers:/n");	scanf("%[^/n]",str);    num_long(str);                 //調(diào)用查找最長(zhǎng)數(shù)字串函數(shù)}char num_long(char *str){	int loc = 0,max_loc = 0;	int len = 0,max_len = 0;	int flag = 0;	int i = 0;	while(str[i] != '/0')                   	{		if(str[i] >= '0' && str[i] <= '9')		{			if(flag == 0)         //標(biāo)志是否是數(shù)字			{				flag = 1;				loc = i;          //記錄數(shù)字串首地址			}			len++;                 //記錄字符串長(zhǎng)度		}		else		{			if(flag == 1)			{				flag = 0;				if(max_len < len)        //比較出最長(zhǎng)字符串				{					max_len = len;					max_loc = loc;				}				len = 0;               //置0，以便記錄下一個(gè)數(shù)字串長(zhǎng)度			}		}		i++;	}	for(i = max_loc; i < (max_loc + max_len); i++)	{		printf("%c",str[i]);	}}串