验证码校验

来源：互联网发布：山东自动化控制软件编辑：程序博客网时间：2024/05/22 06:54

问题：随机生成一组验证码，输入并比较是否输入正确。

代码：

//定义验证字符        char ver[] = {'0','1','2','3','4','5','6','7','8','9','q','w','e','r','t','y','u','i','o','p','a','s','d','f','g','h','j','k','l','z','x','c','v','b','m','n','Q','W','E','R','T','Y','U','I','O','P','A','S','D','F','G','H','J','K','L','Z','X','C','V','B','N','M'};        //计算数组长度        int length = sizeof(ver)/sizeof(char);        //产生随机数下标        Byte n1 = arc4random() % length;        Byte n2 = arc4random() % length;        Byte n3 = arc4random() % length;        Byte n4 = arc4random() % length;        //产生随机数        char a = ver[n1];        char b = ver[n2];        char c = ver[n3];        char d = ver[n4];        printf("Verification code：%C %C %C %C\n",a,b,c,d);        //定义输入验证码字符        char num1[6];        printf(" please input Verification code：\n");        scanf("%s",num1);        char A = num1[0];        char B = num1[1];        char C = num1[2];        char D = num1[3];

<span style="white-space:pre"></span>//使用while循环验证        while(!( A== a & B == b & C == c & D == d)){            printf("error，please input again：\n");            scanf("%s",num1);            A = num1[0];            B = num1[1];            C = num1[2];            D = num1[3];        }        printf("input right\n");

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