Question

When I give the first input, an extra 0 appears before gets() works. But if I remove gets(), then there is no problem. printf() can’t be used because it breaks on blank space. Please give any alternative solution or what should I do?

 #include <cstdio>
 #include <iostream>
 #include <stdlib.h>
 using namespace std;
 int main()
 {
  long long a,i,t,count;
  int op;
  char s[10000];
  scanf("%lld",&t);
  for(i=1;i<=t;i++)
  {
    gets(s);
    a=atoll(&s[7]);
    printf("%lld",a);
  }
  return 0;
 }

Answer 1

The scanf() leaves the end-of-line character of the first line in the input stream which is then consumed by gets(). This is a common beginner’s error often discussed here.

Recommendations:

1. Do not mix scanf() routines with gets() routines.
2. Except for short test programs do not use gets() (instead use fgets()) because with gets() buffer overflows may occur.