//1. 寫一個函數(shù),它的原形是int continumax(char *outputstr,char *intputstr) 
//功能： 
//在字符串中找出連續(xù)最長的數(shù)字串，并把這個串的長度返回， 
//并把這個最長數(shù)字串付給其中一個函數(shù)參數(shù)outputstr所指內(nèi)存。 
//例如："abcd12345ed125ss123456789"的首地址傳給intputstr后，函數(shù)將返回9，outputstr所指的值為123456789 
#include<stdio.h> 
#include<assert.h> 
int continumax(char *outputstr,char *inputstr) 
{    
    assert(outputstr); 
    assert(inputstr); 
    int length = 0; 
    int maxlength = 0;  
    int i = 0; 
    int j = 0; 
    while(inputstr[i] != '\0') 
    { 
        while( inputstr[i] >='0'&& inputstr[i] <= '9') 
        {    
            length++; 
            i++; 
        } 
        if(length > maxlength) 
        { 
            maxlength = length; 
            int k = i-maxlength; 
            for(j = 0; j < maxlength; j++ ) 
            {   

                outputstr[j] =inputstr[k++]; 

            } 
            length = 0; 
            continue; 
        } 
        i++; 
        length = 0; 
    } 
        outputstr[j] = '\0'; 
        return maxlength; 
} 

  

int main( ) 
{    
    char inputstr[ ]= "abcd12345eddafsd125ss123456789"; 
    char outputstr[100]; 

    int max_numstr_length = continumax(outputstr,inputstr); 
    printf("%s\n",outputstr); 
    printf("the max_numstr_length is %d\n", max_numstr_length); 
    return 0; 
}

復(fù)制代碼代碼如下:

#include<iostream.h> 
#include<malloc.h> 

  
int continumax(char * outputstr, char * inputstr) 
{ 
    int len = 0;        //統(tǒng)計數(shù)字字符串的長度 
    int max = 0;        //當(dāng)前最大數(shù)字字符串的長度 
    char *pstr =NULL;   //記錄最大數(shù)字字符的起始位置 

  
    while(* inputstr!= '\0') 
    { 
        if(*inputstr <= '9' && *inputstr >='0')  //統(tǒng)計數(shù)字子字符串的長度 
        { 
            len++; 
            inputstr++; 
            continue; 
        } 
        else if (len > max)        //如果統(tǒng)計出來的數(shù)字字符串大于當(dāng)前的最大數(shù)字子字符串的長度，則更新 
        { 
            max = len; 
            pstr = inputstr-len;       
            len = 0; 
        } 
        inputstr++; 
    } 
    for(int i = 0 ; i<max;i++)  //將最大子字符串的值拷貝給outputstr 
    { 
        *outputstr = *pstr; 
        outputstr++; 
        pstr++; 
    } 

       outputstr = outputstr-max; 
       outputstr[max] ='\0'; 
       cout<<outputstr<<endl; 

       return max; 

      
} 

int main() 
{ 
    char input[] = "de1234de123456ed"; 
    //char * out = (char *)malloc(100*sizeof(char)); 
    char output[100]; 
    int max = continumax(output, input); 
    cout<<max<<endl; 
    return 0; 
}