[C++知识库]版本比对实现

#include <stdio.h>
	#include <string.h>
	char a[]={"1.1.110"};
	char b[]={"1.1.70"};
	char c[]={"1.2.11"};
	char d[]={"1.2.100"};

int VersionCompare(char * version1, char* version2)
{ 
    int index1 = 0;//用来保存比较到了第几个。
    int index2 = 0;

    while (index1 < strlen(version1) || index2 < strlen(version2))//是或不是并，因为不一定一样长
    { 
        int num1 = 0;//记录每个版本号每一段的值
        int num2 = 0;
        while ((index1 < strlen(version1)) && (version1[index1] != '.'))
        { 
            num1 = num1 * 10 + (version1[index1] - '0');
            index1++;
        }

        while ((index2 < strlen(version2)) && (version2[index2] != '.'))
        { 
            num2 = num2 * 10 + (version2[index2] - '0');
            index2++;
        }
		
		printf("n1 %d ",num1);
		printf("n2 %d ",num2);

        if (num1 > num2)//比较大小
        { 
            return 1;
        }
        if (num1 < num2)
        { 
            return -1;
        }
        index1++;
        index2++;
    }
    return 0;
}
 

int main () {
	//memcpy(a,c,7);
	//memcpy(b,d,7);
	printf("hello https://tool.lu/\n");
	printf("str %d",VersionCompare(a,b));
	return 0;
}