c compilers

1I Personally Like 
2https://www.programiz.com/c-programming/online-compiler/

1You can try https://www.onlinegdb.com/ this as well, works really well for me.
2You can also save code there.

1replit.com is your best shot tbh

1#include<stdio.h>
2void accept_num(int arr[],int n);
3int main(void)
4{
5    int n,ptu[n];
6    printf("Enter limit of element in an array:");
7    scanf("%d",&n);
8    accept_num(ptu,n);
9    
10   return 0; 
11}
12void accept_num(int arr[],int n)
13{
14    int i;
15    printf("\nEnter the element:");
16    for (i=0;i<n;i++)
17    {
18        scanf("%d",&arr[i]);
19    }
20    for (i=0;i<n;i++)
21    {
22        printf("\n arr[%d]=%d &arr[%d]=%u",i,arr[i],i,&arr[i]);
23    }
24}

1// I Like https://www.programiz.com/c-programming/online-compiler/
2

1To make your own c compiler:
2	* First start with the lexer/tokenizer, it should turn code to tokens like this:
3	int main(){return 2;} => INT, SPACE_SEPARATOR, {IDENTIFIER, "main"}, OPENING_BRACE, RETURN_KEYWORD, {LITERAL, "2"}, CLOSING_BRACE
4	to do this make a list of tokens and translate code to tokens (i wrote all c tokens for my own c compiler)
5	* Second make a Parser:
6	it will turn tokens to an AST tree
7    you will use it to compile,
8    it ressembles this:
9    	main.cpp << not important
10        	|
11            main_entry: {name: "main", type: "function", return_type: "int"}
12        	|
13           /
14		  {return, type: "keyword"}
15		   |
16		return value: {literal: "2", type: "int"}
17	* And third make an x86 code writer
18    it should translate the tree to x86
19	the result for our code in x86 is:
20	    .globl _main
21        _main:
22            movl    $2 %eax
23            ret
24PS: i am not giving code so you can write your c compiler in any language, and also make you actually feel like you wrote it yourself instead of copy pasting