How do you read scanf until EOF in C?

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Try:

while(scanf("%15s", words) != EOF)

You need to compare scanf output with EOF

Since you are specifying a width of 15 in the format string, you’ll read at most 15 char. So the words char array should be of size 16 ( 15 +1 for null char). So declare it as:

char words[16];

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