C/stdio.h/printf — различия между версиями
Admin (обсуждение | вклад) м (1 версия: Импорт контента...) |
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(нет различий)
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Версия 14:20, 25 мая 2010
Содержание
- 1 31 non-null, automatically
- 2 33 non-null, automatically
- 3 4 decimal places, left-justify
- 4 decimal places, right-justify
- 5 default ivalue width, 4
- 6 minimum 3 overridden, auto 4
- 7 minimum 5 overridden, auto 33
- 8 minimum width 1
- 9 minimum width 10, left-justify
- 10 minimum width 10, right-justify
- 11 minimum width 19, print all 17
- 12 minimum width 20, left-justify
- 13 minimum width 20, right-justify
- 14 minimum width 38, left-justify
- 15 minimum width 38, right-justify
- 16 minimum width 5, left-justify
- 17 minimum width 5, right-justify
- 18 Output char
- 19 print character with ASCII 90
- 20 printf %10d, %10.f
- 21 printf %d for integer
- 22 printf: display message by format
- 23 printf ivalue with + sign
- 24 printf %ld for long integer number
- 25 printf %s for string
- 26 print ivalue as octal value
- 27 print lower-case hexadecimal
- 28 prints 2 chars, left-justify
- 29 prints 2 chars, right-justify
- 30 prints first 2 chars
- 31 print the ASCII code for c
- 32 print upper-case hexadecimal
- 33 right-justify with leading 0"s
- 34 using default number of digits
- 35 using printf arguments
- 36 width 10, 8 to right of "."
- 37 width 20, 2 to right-justify
- 38 width 20, scientific notation
31 non-null, automatically
#include <stdio.h>
int main( )
{
char psz2[] = "string text.";
printf("%s",psz2);
}
33 non-null, automatically
#include <stdio.h>
int main( )
{
char psz1[] = "this is a test";
printf("%s",psz1);
}
4 decimal places, left-justify
#include <stdio.h>
int main( )
{
double dPi = 3.14159265;
printf("%-20.4f",dPi);
}
decimal places, right-justify
#include <stdio.h>
int main( )
{
double dPi = 3.14159265;
printf("%20.4f",dPi);
}
default ivalue width, 4
#include <stdio.h>
int main( )
{
int ivalue = 1234;
printf("%d",ivalue);
}
minimum 3 overridden, auto 4
#include <stdio.h>
int main( )
{
int ivalue = 1234;
printf("%3d",ivalue);
}
minimum 5 overridden, auto 33
#include <stdio.h>
int main( )
{
char psz1[] = "this is a test";
printf("%5s",psz1);
}
minimum width 1
#include <stdio.h>
int main( )
{
char c = "A";
printf("%c",c);
}
minimum width 10, left-justify
#include <stdio.h>
int main( )
{
int ivalue = 1234;
printf("%-d",ivalue);
}
minimum width 10, right-justify
#include <stdio.h>
int main( )
{
int ivalue = 1234;
printf("%10d",ivalue);
}
minimum width 19, print all 17
#include <stdio.h>
int main( )
{
char psz1[] = "this is a test";
printf("%19.19s",psz1);
}
minimum width 20, left-justify
#include <stdio.h>
int main( )
{
double dPi = 3.14159265;
printf("%-20f",dPi);
}
minimum width 20, right-justify
#include <stdio.h>
int main( )
{
double dPi = 3.14159265;
printf("%20f",dPi);
}
minimum width 38, left-justify
#include <stdio.h>
int main( )
{
char psz2[] = "string text.";
printf("%-38s",psz2);
}
minimum width 38, right-justify
#include <stdio.h>
int main( )
{
char psz1[] = "this is a test";
printf("%38s",psz1);
}
minimum width 5, left-justify
#include <stdio.h>
int main( )
{
char c = "A";
printf("%-5c",c);
}
minimum width 5, right-justify
#include <stdio.h>
int main( )
{
char c = "A";
printf("%5c",c);
}
Output char
#include <stdio.h>
int main( )
{
char c = "A";
printf("%c",c);
}
print character with ASCII 90
#include <stdio.h>
int main( )
{
char c = "A";
printf("%c",90);
}
printf %10d, %10.f
#include <stdio.h>
int main()
{
int y = 7, z = 35;
long longVar = 98456;
float floatVar = 8.8;
char *phraseFour = "Formatted: ";
printf("%s %5d %10d %10.5f\n",phraseFour,y,z,floatVar);
return 0;
}
printf %d for integer
#include <stdio.h>
int main()
{
int x = 5;
printf("%d\n",x);
return 0;
}
printf: display message by format
//Header file: #include <stdio.h>
//Declaration: int printf(const char *format, ...);
//Return: the number of characters actually printed. A negative value indicates failure.
// The printf() Format Specifiers
//Code Format
//%a: Hexadecimal output in the form 0xh.hhhhp+d (C99 only).
//%A: Hexadecimal output in the form 0Xh.hhhhP+d (C99 only).
//%c: Character.
//%d: Signed decimal integers.
//%i: Signed decimal integers.
//%e: Scientific notation (lowercase e).
//%E: Scientific notation (uppercase E).
//%f: Decimal floating point.
//%F: Decimal floating point (C99 only; produces uppercase INF, INFINITY, or NAN when applied to infinity or a value that is not a number. The %f specifier produces lowercase equivalents.)
//%g: Uses %e or %f, whichever is shorter.
//%G: Uses %E or %F, whichever is shorter.
//%o: Unsigned octal.
//%s: String of characters.
//%u: Unsigned decimal integers.
//%x: Unsigned hexadecimal (lowercase letters).
//%X: Unsigned hexadecimal (uppercase letters).
//%p: Displays a pointer.
//%n: The associated argument must be a pointer to an integer. This specifier causes the number of characters written (up to the point at which the %n is encountered) to be stored in that integer.
//%%: Prints a percent sign.
#include <stdio.h>
int main(void){
printf("Hi %c %d %s", "c", 10, "there!");
}
/*
Hi c 10 there!*/
printf ivalue with + sign
#include <stdio.h>
int main( )
{
int ivalue = 1234;
printf("%+d",ivalue);
}
printf %ld for long integer number
#include <stdio.h>
int main()
{
char *phraseTwo = "Here"s some values: ";
char *phraseThree = " and also these: ";
int y = 7, z = 35;
long longVar = 98456;
float floatVar = 8.8;
printf("%s %d %d %s %ld %f\n",phraseTwo,y,z,phraseThree,longVar,floatVar);
return 0;
}
printf %s for string
#include <stdio.h>
int main()
{
printf("%s","hello world\n");
char *phrase = "Hello again!\n";
printf("%s",phrase);
return 0;
}
print ivalue as octal value
#include <stdio.h>
int main( )
{
int ivalue = 1234;
printf("%o",ivalue);
}
print lower-case hexadecimal
#include <stdio.h>
int main( )
{
int ivalue = 1234;
printf("%x",ivalue);
}
prints 2 chars, left-justify
#include <stdio.h>
int main( )
{
char psz1[] = "this is a test",
psz2[] = "string text.";
printf("%-19.2s",psz1);
}
prints 2 chars, right-justify
#include <stdio.h>
int main( )
{
char psz1[] = "this is a test";
printf("%19.2s",psz1);
}
prints first 2 chars
#include <stdio.h>
int main( )
{
char psz1[] = "this is a test";
printf("%.2s",psz1);
}
print the ASCII code for c
#include <stdio.h>
int main( )
{
char c = "A";
printf("%d",c);
}
print upper-case hexadecimal
#include <stdio.h>
int main( )
{
int ivalue = 1234;
printf("%X",ivalue);
}
right-justify with leading 0"s
#include <stdio.h>
int main( )
{
double dPi = 3.14159265;
printf("%020f",dPi);
}
using default number of digits
#include <stdio.h>
int main( )
{
double dPi = 3.14159265;
printf("%f",dPi);
}
using printf arguments
#include <stdio.h>
int main( )
{
char psz1[] = "this is a test",
psz2[] = "string text.";
printf("%*.*s",19,6,psz1);
}
width 10, 8 to right of "."
#include <stdio.h>
int main( )
{
double dPi = 3.14159265;
printf("%10.8f",dPi);
}
width 20, 2 to right-justify
#include <stdio.h>
int main( )
{
double dPi = 3.14159265;
printf("%20.2f",dPi);
}
width 20, scientific notation
#include <stdio.h>
int main( )
{
double dPi = 3.14159265;
printf("%20.2e",dPi);
}