Terminal

• Open terminal after pressing super key or using shortcut CTRL+ALT+T
• ls - list the files in the current directory
• pwd - List the path of the working directory/folder.
• mkdir <DIRNAME> - Creates a directory named <DIRNAME>
• cd <DIRNAME> - change directory to whatever specified in <DIRNAME>
• rmdir <DIRNAME>- removed the empty directory as specfied.
• date - system date/time
• clear - clear
• man <CMD> - manual or help pages for all the commands.

Hello World Program

• Learn Hello World program.
• Learn to type and save
• Learn to compile and debug errors if any.
• Learn to execute or run the program.

Evaluations of expressions / datatypes

scanf and printf

functions

condition - if else

loop - while/do-while/for

File reading

Self learning

• gets is deprecated fgets(str, 100, stdin)
• terminal buffer
• variable length array vs malloc // stack vs host alloc
• variadic function
• Not to return char array
• there is no reference in c // only pointers
• the blow is a error in C/gcc. it is okay if you compile with gcc

swap(a,b);

void swap(int &a, int &b){
  *a = *a + *b;
  *b = *a - *b;
  *a = *a - *b;
}

• This is how we should do in c/gcc

swap(&a,&b)

void swap(int *a, int *b){
  *a = *a + *b;
  *b = *a - *b;
  *a = *a - *b;
}