Meaning of C language% 7.2d, --7d,% 7.2f,% 0.2f

1.%d Is the output shaping format , namely int Type data
%-7d It's also plastic surgery , But the output is left aligned , Minimum output 7 position , Insufficient 7 Fill in the space at the right end of bit .

%07d Medium d representative ： Decimal signed integer
7 representative ： The maximum width of the output number , Numbers less than this width are preceded by spaces , Greater than will be output according to its actual length
0 representative ： This is the same as the above 7 Work together , Numbers smaller than this width are preceded by 0 To mend

2.%7.2f Yes , Indicates the least output 7 Bit floating point , There are two decimal places

%7.2f Medium 2 Indicates that the number of decimal places is 2 position ,7 Indicates the least output 7 position , Fill in the space at the left end of the insufficient , such as 123.4567 The output is a space 123.46

%0.2 f Or you could write it as %.2f Means to retain two decimal places

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