Can't use gets instead of scanf?

general
, ,
1

Here is my code for HOLES problem:-

#include<stdio.h>

int main()
{
	int t,count,i;
	char str[100];
	scanf("%d",&t);
	while(t>0)
	{
		i=0;count=0;
		scanf("%s",str);
		while(str[i]!='\0')
		{
			switch (str[i])
			{
				case 'A':
				case 'D':
				case 'O':
				case 'P':
				case 'Q':
				case 'R':
				count++;
				break;
				case 'B':
				count+=2;
				break;
			}
			i++;
		}
		printf("%d\n",count);
		t--;
	}
	return 0;
}

This works fine but if I put gets(str) instead of scanf("%s",str) then it gives me a wrong ans. Can someone explain why?

2

The input might be having blank line after completion of 1 test case.

gets() simply reads a line, so if you are using blank lines in your input, it would be considered as a string with length=0.

Consider the following test case:

2
CODECHEF
DRINKEATCODE

1 Like
3

Alright…Thanks!!

4

If thats the case, you can try putting a getchar() before gets() to remove the newline character from the buffer.

5

but you don’t know how many blank lines user will input, and therefore how many newline characters are…scanf() will take care even if there are 2 or more blank lines