Using the putc() Function
The putc() function writes a character to the specified file stream, which, in our case, is the standard output pointing to your screen.
The syntax for the putc() function is
#include <stdio.h>
int putc(int c, FILE *stream);
Here the first argument, int c, indicates that the output is a character saved in an integer variable c; the second argument, FILE *stream, specifies a file stream. If successful, putc() returns the character written; otherwise, it returns EOF.
In this lesson the standard output stdout is used to be the specified file stream in putc().
The putc() function is used in Listing 5.3 to put the character A on the screen.
TYPE
Listing 5.3. Putting a character on the screen.
1: /* 05L03.c: Outputting a character with putc() */
2: #include <stdio.h>
3:
4: main()
5: {
6: int ch;
7:
8: ch = 65; /* the numeric value of A */
9: printf("The character that has numeric value of 65 is:\n");
10: putc(ch, stdout);
11: return 0;
12: }
OUTPUT
The following is what I get from my machine:
C:\app> 05L03
The character that has numeric value of 65 is:
A
C:\app>
ANALYSIS
As mentioned, the header file stdio.h, containing the declaration of putc(), is included in line 2.
The integer variable, ch, declared in line 6, is assigned the numeric value of 65 in line 8. You may remember that 65 is the numeric value of character A.
Line 9 displays a message to remind the user of the numeric value of the character that is going to be put on the screen. Then, the putc() function in line 10 puts character A on the screen. Note that the first argument to the putc() function is the integer variable (ch) that contains 65, and the second argument is the standard output file stream, stdout.
