例如：
输入：abc123hjuytfsa56789jkl 输出：56789
#include<stdio.h> #include<string.h> #include<stdlib.h> //输出这个字符串中最长的连续数字串 void func(char* str, int size) { char* tmp = (char*)malloc(size + 1); int prev = 0; int end = 0; int i = 0; int m = 0; int n; while (i < size) { //找到了数字串的开头了 if (str[i] <= '9' && str[i] >= '0') { prev = i; end = i; i++; //找数字串的尾吧 while (str[i] <= '9' && str[i] >= '0') { end++; i++; } int s = end - prev; //如果这个数子串比之前的数子串大，就拷贝到临时字符串中 if (m <= s) { for (n = 0; n <= s; n++) { tmp[n] = str[prev]; prev++; } tmp[n] = '\0'; m = n; } } i++; } printf("%s", tmp); } int main() { char str[255] = { 0 }; gets(str); int size = strlen(str); func(str, size); return 0; }