c - I need a library name -

i new @ ubuntu , i'm studying files learn in c programming. wrote codes, can't run them cause of wants me library. so, library contains files? using #include <stdio.h> in ubuntu it's bit different.

#include <stdio.h> #include <stdlib.h>   int main() {     file *ptrfile;     if(ptrfile = fopen("test.txt","w")==null)     {         printf("the  file couldn't opened\n");     }     else     {     int i;     for(i=1; i<=20; i++)     {             fprintf(fptrfile,"%d\n", i*5);     }     fclose(ptrfile);     return 0; } 

the file data opaque struct defined thru <stdio.h> , implementation in c standard library (it implicitly linked gcc - or clang - on ubuntu).

so compile source file aprog.c running in terminal

gcc -wall -g aprog.c -o abinary 

then run ./abinary in same terminal

^{note -wall asks gcc compiler warnings (add -wextra more) , -g asks debug information (to able use gdb debugger, or valgrind, later).}

don't forget install build-essential , libc6-dev ubuntu packages