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Have a close look at the conditionals for your inner for loops. Is < 1 the right test?

One fundamental issue you'll face is that a credit card number is too long for an int; try using get_long() instead. I would recommend starting over with your implementation of Luhn's algorithm. Somet …

You're trying to run the uncompiled .c code instead of the binary. Try running: ./caesar

With regards to your first question, fgetc technically returns an int. While it expects to read a byte of data represented as an unsigned char, it will return a negative number (usually -1, and repres …

You declare the variable counter outside of the loop, so it will retain its value and continuously increment over time. The top left pixel at (0, 0) will have 3 neighbouring pixels, then next pixel at …

I don't know what sort of output you're getting, but at first glance freeing a node whenever it's found in the dictionary will definitely cause you problems.

int m=10; This creates an integer with the value of 10 somewhere in memory. int *ab=&m; This creates a pointer to an int, and sets it to the address of the integer m (that is, the value of ab is the …