串的插入算法程序实现

#include<stdio.h>
#include<string.h>
#define MAX 128
int slength (char ch[])
{
	int i=0;
	while (ch[i]!='\0')i++;
	return i;
} 
int main()
{
	int i,j;
    char ch1[MAX],ch2[MAX],des[MAX];
	printf("input the first string:");
	scanf("%s",ch1);
	printf("input the second string:");
	scanf("%s",ch2);
	if(slength(ch1) + slength(ch2)> MAX) return 1; /*目标串的存贮区不够大*/ 
	for(j=0; j<slength(ch1); j++)
		des[j]= ch1[j];
	for(i=0;i<slength(ch2);j++,i++)
		des[j]= ch2[i];
	des[j]='\0'; /*添加串的结束符号*/
	printf("%s\n",des); 
}