Format character D C S F

1. D format character: used to output a signed decimal integer

   D The previous number indicates the width of the field (the number of columns), such as%5d specified data accounted for 5 columns, the output of data in 5 columns of the right

   If the output is long, add the letter L, which is%ld before D.

2. C format character: used to output one character

   The number before C also indicates the width of the field, with D.

Char ch= ' a ';p rintf ("%c", ch);//Run output a

printf ("%5c", ch);//output a,a preceded by 4 spaces

Char c= '? '; printf ("%d%c", c,c);//output result 63?

3. s format character: used to output a string

printf ("%s", "China"); Export China

4. f Format character

1>%f

The integer part of the real number is all output, and the fractional part outputs 6 bits.

Double a=1.0; printf ("%f\n" A/3);//Run Result: 0.333333//Although a is double precision, A/3 is also double precision but%f format can only output 6 bits

2>%m.nf

Specify data width and scale, such as%7.2f for data 7 columns, where decimals is 2 bits

printf ("%20.15f\n", A/3); Output: 0.333333333333333,//with 3 spaces in front of 0

And a double precision can only guarantee the accuracy of 15 digits of valid digits. Float can only guarantee 6-bit

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Format character D C S F