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How to use printf and why we use printf?

Today we learn about printf , so first of all we have to know that is printf? printf is a function in c programming, which we use to see output of a programming . 

code-944504_960_720

#include<stdio.h>
int main()

{
   printf("This is TechnoRafi");
   return 0;
}

we know this code output is star coder BD, if we don't use scanf() function we can't get this out put 

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