View Code of Problem 43

#include<stdio.h>
int main()
{
  int i;
  char a[100];
  for(i=0; i<=99; i++)
        str[i]='0';
  scanf("%s",a);
  for(i=0;i<100;i++)
  {
    if((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z'))
      printf("%c",a[i]);
  }
  return 0;
}
/*
Main.c: In function ‘main’:
Main.c:7:9: error: ‘str’ undeclared (first use in this function)
         str[i]='0';
         ^
Main.c:7:9: note: each undeclared identifier is reported only once for each function it appears in
*/