Example 1: format specifier fro float in printf
printf("%0k.yf" float_variable_name)
Here k is the total number of characters you want to get printed. k = x + 1 + y (+ 1 for the dot) and float_variable_name is the float variable that you want to get printed.
Suppose you want to print x digits before the decimal point and y digits after it. Now, if the number of digits before float_variable_name is less than x, then it will automatically prepend that many zeroes before it.
Example 2: c printf
/* printf example */
int main()
{
printf ("Characters: %c %c \n", 'a', 65);
printf ("Decimals: %d %ld\n", 1977, 650000L);
printf ("Preceding with blanks: %10d \n", 1977);
printf ("Preceding with zeros: %010d \n", 1977);
printf ("Some different radices: %d %x %o %#x %#o \n", 100, 100, 100, 100, 100);
printf ("floats: %4.2f %+.0e %E \n", 3.1416, 3.1416, 3.1416);
printf ("Width trick: %*d \n", 5, 10);
printf ("%s \n", "A string");
return 0;
}
Example 3: printf format specifiers c
/* printf example in C */
int main()
{
printf ("Characters: %c %c \n", 'a', 65);
printf ("Decimals: %d %ld\n", 1977, 650000L);
printf ("Preceding with blanks: %10d \n", 1977);
printf ("Preceding with zeros: %010d \n", 1977);
printf ("Some different radices: %d %x %o %#x %#o \n", 100, 100, 100, 100, 100);
printf ("floats: %4.2f %+.0e %E \n", 3.1416, 3.1416, 3.1416);
printf ("Width trick: %*d \n", 5, 10);
printf ("%s \n", "A string");
return 0;
}
//*******
Characters: a A
Decimals: 1977 650000
Preceding with blanks: 1977
Preceding with zeros: 0000001977
Some different radices: 100 64 144 0x64 0144
floats: 3.14 +3e+000 3.141600E+000
Width trick: 10
A string
Example 4: c++ char print width
/*
OUTPUT
char variable value: Programming
-----------------------------------------------------
[%s] |Programming|
[%10s] |Programming|
[%15s] | Programming|
[%-15s] |Programming |
[%15.5s] | Progr|
[%-15.5s] |Progr |
-----------------------------------------------------
*/
// NOTE: Specifically used for char data-types (not strings)
char str[]="Programming"; // Length = 11
std::cout << "[%s] |";
printf("%s",str); // Display Complete String
std::cout << "|\n";
std::cout << "[%10s] |";
printf("%10s",str); // 10 < Length: Display Complete String
std::cout << "|\n";
std::cout << "[%15s] |";
printf("%15s",str); // 15 > Length: Displays Complete String with 4 spaces Alignment:Right
std::cout << "|\n";
std::cout << "[%-15s] |";
printf("%-15s",str); // Same as Above But Left Aligned
std::cout << "|\n";
std::cout << "[%15.5s] |";
printf("%15.5s",str); // 15-5 = 10 spaces and show first 5 characters Align : R
std::cout << "|\n";
std::cout << "[%-15.5s] |";
printf("%-15.5s",str); // 15-5 = 10 spaces and show first 5 characters Align : L
std::cout << "|\n";