added cpro 31

Author: hi-im-buggy

_courses/cl1.101

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+---
+code: cl1.101
+name: Introduction to Linguistics - 1
+lecturer: Prof Aditi Mukherjee
+---
+
+Provides a bird's eye view of the area of linguistics.

_posts/2020-11-24-c-pro-lecture-31.md

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+---
+title: C Pro Lecture 31
+author: Pratyaksh Gautam
+code: cs0.101
+number: 31
+---
+
+### `stdin`, `stdout`, and `stderr`
+
+These are file descriptors, numbered as 0, 1, 2 respectively in linux. What we notmally think of as terminal input and output are `stdin` and `stdout` respectively.
+
+## Files and file pointers
+
+In C, we represent files as pointers to memory, `FILE *`. We have two functions very similar to `printf` and `scanf`, which are `frpintf` and `fscanf` respectively.
+
+This allows us to read names from a file without the need for shell input/output redirection.
+```c
+    char line[100];
+    FILE* fpointer = fopen("/path/to/input/file", 'r');  /* open the file in read mode */
+
+```
+
+## Commandline arguments