1. The document introduces the printf() function and how it prints formatted output to the screen or file with format specifiers. 2. It provides an example C program that uses printf() to print the school name and "Program C" to the screen and waits for user input with getch(). 3. The document also explains a grading scale that assigns grades based on percentage ranges from 45-100 being S, 35-44 being S-, 25-34 being S2, and 0-24 being F.

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#include <stdio.h>
&include <conio.h>
void main();
{
clrscr()
prinft(Chakkarat Wittaya School n);
printf("Program Cn");
getch()
}
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& ( 78 &)( 9 - 10 & ) S 7 ก
& ( 78 &)( 7-8 & ) S 7
& ( 78 &)( 5-6 & ) S ก-
& ( 78 &)( 0-4 & ) S ( X