C library function - printf ()

C standard library - <stdio.h>

description

C library functionsint printf (const char * format, ...) formatted output sent to standard output stdout.

statement

Here is () statement printf function.

int printf(const char *format, ...)

parameter

• format - This is the string that contains to be written to the standard output stdout text.It can contain an embedded tag format, the replacement value format tags can be followed by additional parameters specified, and demand-driven format. format labelattribute% [flags] [width] [ length] specifier, explain in detail as follows [precision.]:

• Additional parameters - Depending on the format string, the function may require a series of additional parameters, each containing a value to be inserted, replacing the format specified in the parameters% each label.The number of parameters should be the same as the number of label%.

return value

If successful, the total number of characters written is returned, otherwise returns a negative number.

Examples

The following example demonstrates the printf () function is used.

#include <stdio.h>

int main ()
{
   int ch;

   for( ch = 75 ; ch <= 100; ch++ ) {
      printf("ASCII 值 = %d, 字符 = %c\n", ch , ch );
   }

   return(0);
}

Let's compile and run the above program, which will result in the following:

ASCII 值 = 75, 字符 = K
ASCII 值 = 76, 字符 = L
ASCII 值 = 77, 字符 = M
ASCII 值 = 78, 字符 = N
ASCII 值 = 79, 字符 = O
ASCII 值 = 80, 字符 = P
ASCII 值 = 81, 字符 = Q
ASCII 值 = 82, 字符 = R
ASCII 值 = 83, 字符 = S
ASCII 值 = 84, 字符 = T
ASCII 值 = 85, 字符 = U
ASCII 值 = 86, 字符 = V
ASCII 值 = 87, 字符 = W
ASCII 值 = 88, 字符 = X
ASCII 值 = 89, 字符 = Y
ASCII 值 = 90, 字符 = Z
ASCII 值 = 91, 字符 = [
ASCII 值 = 92, 字符 = \
ASCII 值 = 93, 字符 = ]
ASCII 值 = 94, 字符 = ^
ASCII 值 = 95, 字符 = _
ASCII 值 = 96, 字符 = `
ASCII 值 = 97, 字符 = a
ASCII 值 = 98, 字符 = b
ASCII 值 = 99, 字符 = c
ASCII 值 = 100, 字符 = d

C standard library - <stdio.h>