String inserting/deleting are similar to integer array shifting, because strings are arrays of char.
This time, we will insert or delete more than one charactes.
/*Description: String Processing
insert, delete
Author: Liutong Xu
*/
#include<stdio.h>
#define LSIZE 81
void strInsert(char str1[LSIZE], int pos, char str2[LSIZE]);
void strDelete(char str1[LSIZE], int iBegin, int iLen);
int main()
{
char str1[LSIZE] = "Welcome Beijing!";
char str2[] = "to ";
int iBegin, iLen;
int pos = 8;
iBegin = 5;
iLen = 6;
printf("string1 is %s\n", str1);
strInsert(str1, pos, str2);
printf("\nafter inserting str2 at position %d\n", pos);
printf("string1 is %s\n", str1);
strDelete(str1, iBegin, iLen);
printf("\nafter deleting %d char from position %d\n", iLen, iBegin);
printf("string1 is %s\n", str1);
return 0;
}
void strDelete(char str[LSIZE], int iBegin, int iLen) //delete iLen chars from str[iBegin]
{
int i;
int len = 0;
while(str[len]) len++;
if(len > iBegin + iLen) //NOTE
for(i = iBegin; i<=len-iLen; i++)
str[i] = str[i + iLen];
else
str[iBegin] = '\0';
}
void strInsert(char str1[LSIZE],int pos,char str2[LSIZE]) //insert str2 at str1[pos]
{
int i, i1 = 0, i2 = 0;
while(str2[i2]) i2++; //length of str2;
while(str1[i1]) i1++; //str1[i1] is '\0'
for(i = i1; i >= pos; i--)
str1[i+i2] = str1[i];//move str1[pos-i1] to a right offset i2
for(i = 0; i < i2; i++) //insert str2
str1[pos + i] = str2[i];
}
stdout
string1 is Welcome Beijing!
after inserting str2
string1 is Welcome to Beijing!
after deleting 6 char from position 5
string1 is WelcoBeijing!
end
