Introduction
A null pointer is a pointer that does not point to any memory address. In C programming, a null pointer is represented by the constant NULL, which is defined in the header file stdio.h. Using a null pointer can help to avoid errors and add functionality to C programs.
In this lab, you will learn about null pointers and how to use them in C programming. You will create a program that uses null pointers to search for names in an array.
Note: You need to create the file ~/project/main.c
yourself to practice coding and learn how to compile and run it using gcc.
cd ~/project
## create main.c
touch main.c
## compile main.c
gcc main.c -o main
## run main
./main
Skills Graph
%%%%{init: {'theme':'neutral'}}%%%%
flowchart RL
c(("`C`")) -.-> c/UserInteractionGroup(["`User Interaction`"])
c(("`C`")) -.-> c/BasicsGroup(["`Basics`"])
c(("`C`")) -.-> c/ControlFlowGroup(["`Control Flow`"])
c(("`C`")) -.-> c/CompoundTypesGroup(["`Compound Types`"])
c(("`C`")) -.-> c/PointersandMemoryGroup(["`Pointers and Memory`"])
c(("`C`")) -.-> c/FunctionsGroup(["`Functions`"])
c/UserInteractionGroup -.-> c/output("`Output`")
c/BasicsGroup -.-> c/comments("`Comments`")
c/BasicsGroup -.-> c/variables("`Variables`")
c/BasicsGroup -.-> c/data_types("`Data Types`")
c/BasicsGroup -.-> c/operators("`Operators`")
c/ControlFlowGroup -.-> c/if_else("`If...Else`")
c/ControlFlowGroup -.-> c/while_loop("`While Loop`")
c/ControlFlowGroup -.-> c/for_loop("`For Loop`")
c/ControlFlowGroup -.-> c/break_continue("`Break/Continue`")
c/CompoundTypesGroup -.-> c/arrays("`Arrays`")
c/CompoundTypesGroup -.-> c/strings("`Strings`")
c/UserInteractionGroup -.-> c/user_input("`User Input`")
c/PointersandMemoryGroup -.-> c/pointers("`Pointers`")
c/FunctionsGroup -.-> c/function_parameters("`Function Parameters`")
c/FunctionsGroup -.-> c/function_declaration("`Function Declaration`")
subgraph Lab Skills
c/output -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/comments -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/variables -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/data_types -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/operators -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/if_else -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/while_loop -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/for_loop -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/break_continue -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/arrays -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/strings -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/user_input -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/pointers -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/function_parameters -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
c/function_declaration -.-> lab-123293{{"`Using Null Pointer in C Programming`"}}
end