C language (float,double,longDouble)

int main (int argc, const char * argv[]) {
 float   myFloat;
 double   myDouble;
 long double  myLongDouble;
 
 myFloat = 12345.67890123456789F;
 myDouble = 12345.67890123456789;
 myLongDouble = 12345.67890123456789L;
 
 printf( "sizeof( float ) = %d\n", (int)sizeof( float ) );
 printf( "sizeof( double ) = %d\n", (int)sizeof( double ) );
 printf( "sizeof( long double ) = %d\n\n", (int)sizeof( long double ) );
 
 printf( "myFloat = %f\n", myFloat );
 printf( "myDouble = %f\n", myDouble );
 printf( "myLongDouble = %Lf\n\n", myLongDouble );
 
 printf( "myFloat = %25.16f\n", myFloat );
 printf( "myDouble = %25.16f\n", myDouble );
 printf( "myLongDouble = %25.16Lf\n\n", myLongDouble );
 
 printf( "myFloat = %10.1f\n", myFloat );
 printf( "myFloat = %.2f\n", myFloat );
 printf( "myFloat = %.12f\n", myFloat );
 printf( "myFloat = %.9f\n\n", myFloat );
 
 printf( "myFloat = %e\n\n", myFloat );
 
 myFloat = 100000;
 printf( "myFloat = %g\n", myFloat );
 
 myFloat = 1000000;
 printf( "myFloat = %g\n", myFloat );
 
 return 0;
}

result

sizeof( float ) = 4
sizeof( double ) = 8
sizeof( long double ) = 16

myFloat = 12345.678711
myDouble = 12345.678901
myLongDouble = 12345.678901

myFloat =    12345.6787109375000000
myDouble =    12345.6789012345670926
myLongDouble =    12345.6789012345678902

myFloat =    12345.7
myFloat = 12345.68
myFloat = 12345.678710937500
myFloat = 12345.678710938

myFloat = 1.234568e+04

myFloat = 100000
myFloat = 1e+06