Points of C

Basic

Head Part

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#include <stdio.h> // from system
#include "xx.h" // from current folder

Loops

For loops

Usage:

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for (init; condition; increment)
{
   ...
}

Tips:

1. In “init” part, remember to create a new variable.
2. Start with 0, use i<n to loop n times.

While loops and do-while loops

Usage:

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while(condition)
{
   ...
}

do
{
   ...
} while (condition);

Array

To create an array

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int a[4];

Initialization

1. You could initialize the elements partly: when elements provided is less than those in the array, only former elements were assigned.

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int a[10]= {0, 1, 2};

2. You could only assign elements one by one even assigning same value:

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int a[10]= {1, 1, 1, 1, 1, 1, 1, 1, 1, 1};

3. Not providing the length is allowed:

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// these two are equal
int a[]={1,2,3,4,5};
int a[5]={1,2,3,4,5};

Pointer

Click for more about pointer in c

Struct

Click for more about struct in c