将字符串插入到指定位置

//将一个字符串插入到另一个字符串的指定位置
#define NUM 256
#include
main()
{
    char  pp[NUM],opp[NUM];
    int  i=0,j=0,k=0,n=0,npp,nopp,npp2;
    printf(" please input a line char :\n");
    gets(pp);
    printf(" please input a string :\n");
    gets(opp);
    printf(" n= ");
    scanf("%d",&n);
    for(i=0;(pp[i]!='\0');i++);
    npp=i;
    for(j=0;(opp[j]!='\0');j++);
    nopp=j;
    printf("\n******************************************************\n\n");
    printf(" the length of pp is < %d > , opp is < %d > !\n ",npp,nopp);
    printf(" In < %s > , you want to make < %s > at < %d > !\n\n",pp,opp,n);
    for(i=npp;i>=n;i--)
    {
        pp[i+nopp]=pp[i];
    }
    for(i=0;i     {
        pp[i+n]=opp[i];
    }
    printf(" Finally , the pp is < %s > !\n",pp);
    for(k=0;(pp[k]!='\0');k++);
    npp2=k;
    printf(" the length of second pp is < %d > !",npp2);

}