顺序串基本操作

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#include <stdio.h>#define MaxSize 100    //最多的字符个数typedef struct{   char data[MaxSize];//定义可容纳MaxSize个字符的空间    int length;             //标记当前实际串长} SqString;void StrAssign(SqString &s,char cstr[])//创建串{int i;for (i=0;cstr[i]!='\0';i++)s.data[i]=cstr[i];s.length=i;}void StrCopy(SqString &s,SqString t)//s为引用型参数{int i;for (i=0;i<t.length;i++)s.data[i]=t.data[i];s.length=t.length;}bool StrEqual(SqString s,SqString t){bool same=true;int i;if (s.length!=t.length)//长度不相等时返回0same=false;elsefor (i=0;i<s.length;i++)if (s.data[i]!=t.data[i])//有一个对应字符不相同时返回0{same=false;break;}return same;}int StrLength(SqString s)//求串的长度{return s.length;}SqString Concat(SqString s,SqString t){SqString str;int i;str.length=s.length+t.length;for (i=0;i<s.length;i++)//将s.data[0..s.length-1]复制到strstr.data[i]=s.data[i];for (i=0;i<t.length;i++)//将t.data[0..t.length-1]复制到strstr.data[s.length+i]=t.data[i];return str;}SqString SubStr(SqString s,int i,int j)//提取串s的第i个字符开始的j个字符{SqString str;int k;str.length=0;if (i<=0 || i>s.length || j<0 || i+j-1>s.length)return str;//参数不正确时返回空串for (k=i-1;k<i+j-1;k++)  //将s.data[i..i+j]复制到strstr.data[k-i+1]=s.data[k];str.length=j;return str;}SqString InsStr(SqString s1,int i,SqString s2)//在串s1的第i个位置插入串s2{int j;SqString str;str.length=0;if (i<=0 || i>s1.length+1)  //参数不正确时返回空串return str;for (j=0;j<i-1;j++)      //将s1.data[0..i-2]复制到strstr.data[j]=s1.data[j];for (j=0;j<s2.length;j++)//将s2.data[0..s2.length-1]复制到strstr.data[i+j-1]=s2.data[j];for (j=i-1;j<s1.length;j++)//将s1.data[i-1..s1.length-1]复制到strstr.data[s2.length+j]=s1.data[j];str.length=s1.length+s2.length;return str;}SqString DelStr(SqString s,int i,int j)//从s的第i个位置删除j个字符{int k;SqString str;str.length=0;if (i<=0 || i>s.length || i+j>s.length+1) //参数不正确时返回空串return str;for (k=0;k<i-1;k++)       //将s.data[0..i-2]复制到strstr.data[k]=s.data[k];for (k=i+j-1;k<s.length;k++)//将s.data[i+j-1..s.length-1]复制到strstr.data[k-j]=s.data[k];str.length=s.length-j;return str;}SqString RepStr(SqString s,int i,int j,SqString t)//将串s第i个字符开始的j个字符替换成串t{int k;SqString str;str.length=0;if (i<=0 || i>s.length || i+j-1>s.length) //参数不正确时返回空串return str;for (k=0;k<i-1;k++)//将s.data[0..i-2]复制到strstr.data[k]=s.data[k];for (k=0;k<t.length;k++)   //将t.data[0..t.length-1]复制到strstr.data[i+k-1]=t.data[k];for (k=i+j-1;k<s.length;k++)//将s.data[i+j-1..s.length-1]复制到strstr.data[t.length+k-j]=s.data[k];str.length=s.length-j+t.length;return str;}void DispStr(SqString s)//输出串{int i;if (s.length>0){for (i=0;i<s.length;i++)printf("%c",s.data[i]);printf("\n");}}int  main(){SqString s,s1,s2,s3,s4;printf("顺序串的基本运算如下:\n");printf("  (1)建立串s和串s1\n");StrAssign(s,"abcdefghijklmn");StrAssign(s1,"123");printf("  (2)输出串s:");DispStr(s);printf("  (3)输出串s1:");DispStr(s1);printf("  (4)串s的长度:%d\n",StrLength(s));printf("  (5)在串s的第9个字符位置插入串s1而产生串s2\n");s2=InsStr(s,9,s1);printf("  (6)输出串s2:");DispStr(s2);printf("  (7)删除串s第2个字符开始的3个字符而产生串s2\n");s2=DelStr(s,2,3);printf("  (8)输出串s2:");DispStr(s2);printf("  (9)将串s第2个字符开始的5个字符替换成串s1而产生串s2\n");s2=RepStr(s,2,5,s1);printf("  (10)输出串s2:");DispStr(s2);printf("  (11)提取串s的第2个字符开始的10个字符而产生串s3\n");s3=SubStr(s,2,10);printf("  (12)输出串s3:");DispStr(s3);printf("  (13)将串s1和串s2连接起来而产生串s4\n");s4=Concat(s1,s2);printf("  (14)输出串s4:");DispStr(s4);return 0;}
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