The following program deletes n consecutive words starting from the ith character from the string str

#include <stdio.h>
 
#include <string.h>//string  Turned out to be stdlib 
void main()
{  char  str[81];
int   i,n;
printf(" Please enter the string str Value :\n");
scanf("%s",str);
printf(" The string you entered str yes :%s\n",str);
printf(" Please enter the deletion location i And the number of characters to be deleted n Value :\n");
scanf("%d%d",&i,&n);
while (i+n-1>strlen(str))
{  printf(" Delete location i And the number of characters to be deleted n The value of is wrong ！ Please re-enter i and n Value \n");
scanf("%d%d",&i,&n);
}
 
while(str[i+n-1])//str[i+n]
{  str[i-1]=str[i+n-1];
i++;
}
 
str[i-1]='\0';//str[i]='\0';
printf(" The deleted string str yes :%s\n",str);
}