Printf function - conversion description

• Conversion instructions %4d Will be with -123 Display the number in the form of 123; Conversion instructions %-4d Will be with 123- The form shows 123.（- On behalf of the space ）

# include <stdio.h>

int main()
{
	printf("0123456789\n");
	printf("%10d\n", 1234);
	printf("%-10d\n", 1234);


	return 0;
}

• e—— The index （ Scientific notation ） Floating point numbers in the form of .
• f—— Express “ Fixed point decimal ” Floating point numbers in the form of .
• g—— Represents a floating-point number in exponential form or fixed-point decimal form , The choice of form depends on the size of the number . If the value to be displayed does not have a number after the decimal point ,g The decimal point will not be displayed . however , When displaying very large or very small numbers , specifier g Will be converted to exponential form to reduce the number of characters required .

• # include <stdio.h>
  
  int main()
  {
  	int i;
  	double x;
  
  	i = 40;
  	x = 839210;
  
  	printf("|%d|%5d|%-5d|%5.4d|\n", i, i, i, i);
  	//printf("|%10.3f|%10.4e|%-10g|\n", x, x, x);
  	printf("%10.4e\n", x);
  
  	return 0;
  }