#include <stdio.h> #define MaxSize 100 typedf struct { char data[MaxSize]; int length; } SqString; void StrAssign(SqString &s, char cstr[]) { int i; for (i = 0; sctr[i] != '0'; i++) s.data[i] = cstr[i]; s.length = i; } void DispStr(SqString s) { if (s.length > 0) { for (int i = 0; i < s.length; i++) printf("%c", s.data[i]); printf(\n); } } SqString A, B; SqString EnCrypt(SqString p) { int i = 0, j; SqString q; while (i < p.length) { for (j = 0; p.data[i]！ = A.data[j] && j <= A.length; j++); if (j >= A.length) q.data[i] = p.data[i]; else q.data[i] = B.data[j]; i++; } q.data = p.data; retrun q; } SqString UnEncrypt(SqSring q) { int i = 0, j; SqString q; while (i < p.length) { for (j = 0; q.data[i] != B.data[j] && j <= B.length; j++); if (j >= B.length) p.data[i] = q.data[i]; else p.data = A.data[j]; ' i++; } p.length = q.length; return p; } int main() { SqString p, q; int ok = 1; StrAssign(A, "abcdefghigklmnopqrstuvwxyz"); StrAssign(B, "ngzqtcobmuhelkpdawxfyivrsj"); char str[MaxSize]; printf("\n"); printf("输入原文串："); gets(str); StrAssign(p, str); printf("\n加密解密如下："); printf("\n原文串:"); DispStr(p); q = EnCrypt(p); printf("\n加密串:"); DispStr(q); p = UnEncrypt(q); printf("\n解密串:"); DispStr(p); printf("\n"); return 1; }改下bug

在代码中有两个错误：
1. 在函数EnCrypt中，SqString类型的变量q被定义了两次，应该改为SqString类型的变量res。
2. 在函数UnEncrypt中，赋值语句中的单引号是多余的，应该将其删除。

修正后的代码如下：

#include <stdio.h>
#define MaxSize 100
typedef struct {
    char data[MaxSize];
    int length;
} SqString;

void StrAssign(SqString &s, char cstr[]) {
    int i;
    for (i = 0; cstr[i] != '0'; i++) {
        s.data[i] = cstr[i];
    }
    s.length = i;
}

void DispStr(SqString s) {
    if (s.length > 0) {
        for (int i = 0; i < s.length; i++) {
            printf("%c", s.data[i]);
        }
        printf("\n");
    }
}

SqString A, B;

SqString EnCrypt(SqString p) {
    int i = 0, j;
    SqString res;
    while (i < p.length) {
        for (j = 0; p.data[i] != A.data[j] && j < A.length; j++);
        if (j >= A.length) {
            res.data[i] = p.data[i];
        }
        else {
            res.data[i] = B.data[j];
        }
        i++;
    }
    res.length = p.length;
    return res;
}

SqString UnEncrypt(SqString q) {
    int i = 0, j;
    SqString p;
    while (i < q.length) {
        for (j = 0; q.data[i] != B.data[j] && j < B.length; j++);
        if (j >= B.length) {
            p.data[i] = q.data[i];
        }
        else {
            p.data[i] = A.data[j];
        }
        i++;
    }
    p.length = q.length;
    return p;
}

int main() {
    SqString p, q;
    int ok = 1;
    StrAssign(A, "abcdefghigklmnopqrstuvwxyz");
    StrAssign(B, "ngzqtcobmuhelkpdawxfyivrsj");
    char str[MaxSize];
    printf("\n");
    printf("输入原文串：");
    gets(str);
    StrAssign(p, str);
    printf("\n加密解密如下：");
    printf("\n原文串:");
    DispStr(p);
    q = EnCrypt(p);
    printf("\n加密串:");
    DispStr(q);
    p = UnEncrypt(q);
    printf("\n解密串:");
    DispStr(p);
    printf("\n");
    return 1;
}