If statement being ignored in main function [duplicate]

Answer 1

The string that fgets gets has a trailing \n in the end. You need to remove it manually, or compare it with "encrypt\n"

Answer 2

Use this version of strcmp():

if (strncmp(choice, "encrypt", 7) == 0)

The problem is that fgets stores the newline character with your string, so to take only the first N characters to compare and leave the \n out of the comparison , use strncmp to give the amount of chars you want to compare with