How to count repetitions of characters using getchar

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I am trying to write a c program using getchar() which outputs the repetition of characters in a word.
For example if the input is xxxyyyzzz the output should be 333 (as each are repeated 3 times) and if input is xxyzz it should be 212.

I am a beginner and it just seems too tricky for me.

What I have tried:

C++

int nc ;
int count = 0;
for (nc=0 ; getchar()!=EOF;++nc) 
{
  printf ("%d",nc); 
}

I tried working around with this program but no matter what it simply outputs the total characters, even including the newline or enter. Any suggestions would be appreciated ! Thank yoi

Posted 6-Feb-18 19:11pm

Member 13665115

Updated 6-Feb-18 21:07pm

CPallini

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OriginalGriff · Answer 1 · 2018-02-06T20:04:00

This is your homework, so I'll give you no code!
But ... it isn't complex:
1) Add a char variaable called lastTime and set it to the value returned by getchar().
2) Add an integer called count, and set it to one.
3) Start a loop (do...while is probably a good choice)
3.1) Read a character into a variable.
3.2) Compare the new character with the lastTime value.
3.2.1) If they are the same, increment count
3.2.2) If they are different then:
3.2.2.1) Print count, and set it to one
3.2.2.2) Set lastTime to the new character
3.3) If you are at the end of the input, exit the loop.
4) After the loop, print the count.