#include <stdio.h>
#include <stdlib.h>
#define MAX_NUM 100
typedef struct str{
char ch[MAX_NUM+1];
int length;
}*SString;
//字符串初始化
SString initSString()
{
SString str=(SString)malloc(sizeof(struct str));
if(!str)
printf("动态内存分配失败!\n");
str->length=0;
// printf("串初始化成功!\n");
return str;
}
//判断字符串是否为空
int isEmpty(SString str)
{
if(str->length==0)
{
return 1;
}
return 0;
}
//字符串赋值
SString strAssign(SString str,char s[])
{
int i=0;
while(s[i])
{
str->ch[++str->length]=s[i];
i++;
}
return str;
}
//打印字符串
void printSString(SString str)
{
int i;
for(i=1;i<=str->length;i++)
printf("%c",str->ch[i]);
printf("\n");
}
//字符串复制
SString strCopy(SString str1,SString str2)
{
int i;
for(i=1;i<=str2->length;i++)
{
str1->ch[i]=str2->ch[i];
}
str1->length=str2->length;
return str1;
}
SString strCat(SString str1,SString str2)
{
SString str3=initSString();
int i;
for(i=1;i<=str1->length;i++)
str3->ch[i]=str1->ch[i];
for(i=1;i<=str2->length;i++)
str3->ch[i+str1->length]=str2->ch[i];
str3->length=str1->length+str2->length;
return str3;
}
//获取字符串的长度
int getStrLength(SString str)
{
return str->length;
}
//在串str1的pos位置插入串str2
SString strInsert(SString str1,int pos,SString str2)
{
if(pos<1||pos>str1->length)
{
printf("插入位置错误!\n");
exit(0);
}
int i;
for(i=pos;i<=str1->length;i++)
{
str1->ch[i+str2->length]=str1->ch[i];
}
for(i=1;i<=str2->length;i++)
{
str1->ch[i+pos-1]=str2->ch[i];
}
str1->length=str2->length+str1->length;
return str1;
}
//删除指定位置的字符
SString strDelete(SString str,int pos,int len)
{
if(pos<1||pos>str->length||len+pos-1>str->length)
{
printf("删除位置错误!\n");
exit(0);
}
int i;
for(i=pos+len;i<=str->length;i++)
{
str->ch[i-len]=str->ch[i];
}
str->length=str->length-len;
return str;
}
//求子串
SString subString(SString str,int pos,int len)
{
if(pos<1||pos>str->length||len+pos-1>str->length)
{
printf("输入位置错误!\n");
exit(0);
}
int i;
SString subStr=initSString();
for(i=1;i<=len;i++)
{
subStr->ch[i]=str->ch[i+pos-1];
}
subStr->length=len;
return subStr;
}
//销毁字符串
void destorySString(SString str1)
{
free(str1);
}
int main()
{
SString str=initSString(),str2=initSString();
char s[100],s2[100],s3[100],s4[100];
printf("请输入一个字符串str1:\n");
scanf("%s",s);
str=strAssign(str,s);
printf("打印字符串str1:\n");
printSString(str);
printf("拷贝字符串str1到字符串str2\n");
strCopy(str2,str);
printf("打印字符串str2:\n");
printSString(str2);
/*SString str3=strCat(str,str2);
printSString(str3);*/
int insertLocation;
printf("请输入插入位置、插入字符串str4:\n");
scanf("%d",&insertLocation);
scanf("%s",s4);
SString str4=initSString();
str4=strAssign(str4,s4);
str=strInsert(str,insertLocation,str4);
printf("打印插入str4后的字符串str1:");
printSString(str);
int delLocation,delLength;
printf("请输入字符串str1删除字符的位置和长度:\n");
scanf("%d %d",&delLocation,&delLength);
strDelete(str,delLocation,delLength);
printSString(str);
int subLocation,subLength;
printf("请输入字符串str1的子串位置和长度:\n");
scanf("%d %d",&subLocation,&subLength);
SString subStr= subString(str,subLocation,subLength);
printSString(subStr);
printf("销毁字符串st1:\n");
destorySString(str);
return 0;
}
请问在最后一main函数哪里加个比较字符串的长度