#include

void main()

{

void insert(char a[],char b[],int t);

char a[100],b[100];

int t,i,j;

printf("input a string:\n");

gets(a);

printf("inut b string:\n");

gets(b);

printf("input the position to insert:\n");

scanf("%d",&t);

if(tstrlen(a)+1)

{

printf("wrong!.input again");

scanf("%d",&t);

}

insert(a,b,t);

}

void insert(char a[],char b[],int t)

{

int len1,len2;

int i,j,k,l;

char c[100];

len1=strlen(a);

len2=strlen(b);

for(i=0;i