Week 1

Source code - what human programmers write
Compiler - translates source code into machine code

Code Descriptions
correctness - does the code run as intended?
Design - how well is the code designed?
Style - how aesthetically pleasing is the code?

code.cs50.io - to access visual studio

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// create script called hello.c
code hello.c

//make script executable
make hello

//compile code
./hello
---------------Example Script ---------------
#include <stdio.h>

int main(void)
{
    printf("hello, world\n");
}
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// load header library
#include <stdio.h>

int main(void)
{
}

printf("hello, world\n");
//printf(const char *format,...) sends formatted output to stdout
//Requires quotation marks for string
// /n terminates the line
//semicolon is an end statement to terminate the current statement

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cs50 has its own library ==> cs50.h

Manual ==> manual.cs50.io

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//Create a function that asks your names and outputs your name as a response
#include <stdio.h>
#include <cs50.h>

int main(void)
{
    string name = get_string("What's your name? ");
    printf("hello, %s\n", name);
}

-------Comparing integer variables----------
#include <cs50.h>
#include <stdio.h>

int main(void)
{
    int x = get_int("What's x? ");
    int y = get_int("What's y? ");

    if (x < y)
    {
        printf("x is less than y\n");
    }
    else if (x > y)
    {
        printf("x is greater than y\n");
    }
    else
    {
        printf("x is EQUAL to y\n");
    }
}

------- Loops ---------
#include <stdio.h>

int main(void)
{
    int i = 0;
    while (i < 3)
    {
        printf("meow\n");
        i++;
    }
}


------- Further simplified ---------
#include <stdio.h>

int main(void)
{
    for (int i = 0; i < 3; i++)
    {
        printf("meow\n");
    }
}
--------> for loop. Load integer 'i' to zero. check if it's less than three. increment i and repeat. First part before the semicolon only cycles once.